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#1 (permalink) |
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Member
Join Date: May 2003
Location: oakland,or
Posts: 233
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heater valve
DAN |
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#3 (permalink) |
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Member
Join Date: May 2003
Location: oakland,or
Posts: 233
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I searched thru parts books till I found a valve that looked and worked the same as the opel. Then I went to wrecking yard and found the valve, not sure of year. I was going to order a new one if it worked ok but the used one has worked great and no leaks.
I dont know what the GT valve looks like, the manta is 90 degrees and the cable pushes to open the valve. DAN |
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#5 (permalink) |
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1000 Post Club
Join Date: May 2003
Location: Salfordville, PA
Posts: 2,138
Real Name: Jeff
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OGTS does sell a valve which will work in a GT. I haven't tried it so I can't say how well it works.
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1972 Opel GT, Owner since 1983 2001 Saab 9-5 SE 3.0 Turbo V6 Weeeeeeeeeee!!! 1973 GT, Parted out, R.I.P. 1968 Kadette, Owner since 2006, Sold, 28 June 2008 |
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#9 (permalink) |
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I finally own an Opel!
Join Date: Jan 2004
Location: Knoxville
Posts: 105
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Looking through available Heater Control Valves at the local Advance Auto Parts I didn't find anything that resembled a GT valve that fit a mid 80's Accord but the 86 Civic valve looks very similar in design.
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#10 (permalink) |
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former opel racer
Join Date: Nov 2002
Location: near some glaciers
Posts: 2,863
Real Name: Jeff "Oh-Oh" Denton
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Go to a truck shop and get one for a Kenworth. It'll be just what you need.
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No Opels were harmed in the filming of this movie. However two Mustangs, a Pinto, and a Capri were hospitalized. One Mustang was euthanized the next morning. |
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#11 (permalink) |
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Opeler
Join Date: May 2006
Location: Hudsonville, Michigan, USA
Posts: 1,794
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since my old valve was seized I've been looking for replacements, so far I've searched here and have seen references to mid $80's Hondas, an '85 Civic, there's new at OTGS ($69-ouch). One member (DESTEC) has rigged a solenoid valve up to his blower rocker switch, turning on blower either speed will also open valve, seems like a good idea
http://www.opelgt.com/forums/group-9...-blower-2.html I came across this one early in a search, probably many like it: Servo Heater Valve Benefit: no mechanical cable to keep in shape, no risk of seizure transferring force to control slider and breaking stuff Downside: another electrical device to keep happy, Questions: the original mechanical valve is somewhat adjustable, (can open the valve a little or all the way) I wonder if this has any discernable effect on temperature control (I don't think so)? So using a valve that is either completely open or completely closed won't matter? Hooked up to blower switch: How often, if ever would a guy have the valve open; heater core heated but the fan motor off? I can see maybe if you want a tad of defrost or some "ambient" heat. Just wonder from you long time GT drivers. I don't plan on driving mine all winter but I'm certain to see frosty mornings quite often. PS old valve has been cleaned up and funtions but is pretty stiff, how much resistance is normal?
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"Being ignorant is not so much a shame, as being unwilling to learn." Benjamin Franklin Last edited by jvandyke; 02-14-2007 at 11:22 AM. |
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#12 (permalink) |
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Senior Contributor
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I don't have a working GT...yet...but many vehicles use a water flow valve to regulate heat in the passenger compartment. I would think that the GT interior temp. would be greatly affected by coolant flow to the heater core, especially since it is such a small car.
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Jeff '73 GT,5spd,Recaro,EDIS4 2.2 EFI by MegaSquirt, Ali Flywheel w/S10 Clutch, Electric Fan, Roller Rockers, Venolia Pistons, 6 Cyl Intake w/ Custom Injection, 15" Wheels,Lecarra,F&R Sway Bars,Custom Exhaust,1" Sport Spring,Koni Reds,Big Brakes,3 Core Ali Radiator,Hse of Colors Kandy Pagan Gold. 123 WHP @ 6800 RPM ![]() '64 VW Karmann Ghia '08 BMW M3 |
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#13 (permalink) | |
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Opeler
Join Date: May 2006
Location: Hudsonville, Michigan, USA
Posts: 1,794
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Another way to state it is: how much temp control does the heater valve have?
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"Being ignorant is not so much a shame, as being unwilling to learn." Benjamin Franklin Last edited by tekenaar; 02-14-2007 at 01:07 PM. Reason: do? |
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#14 (permalink) |
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6,000 Post Club
Join Date: Aug 2002
Location: Imperial Beach, CA South of San Diego
Posts: 6,054
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Coolant flow through the heater box determines the amount of heat available to the interior or defroster ducts. Also the fan switch position. You gotta remember, there will be "cold" air coming in through the heater box, normal heat transference will take effect, cooling the liquid in the heater core. The more coolant flow the hotter the air exiting through it. That's how the temp inside the interior is regulated. The air flow direction, heater or defroster is regulated by the air flow flapper valves. They control the amount of air flow to either the heater ducts or defog ducts or a combo of both. Once the air flow is opened to the max setting for heat, all the air available goes through the heatter core, where it goes is a further function of tat valve. Limiting the travel of the air flow valve initially, does have an impact of the amount of heat coming into the interior, less air flow, less heat. A couple of notes on this, early Ford heaters had no coolant flow regulator, they limited the air flow thrugh the heater core. Also, if you ever experieince an over temp condition, set the heater for full heat, open up the air flow valve to full flow, turn the fan switch on high and your coolant temp will go down a fair amount, after all the heater core is just a small radiator connected to the system coolant.
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Ron 72 GT 3.4L V-6/T-5/ZF posi - almost done - Just need AC installed. ![]() 75 Chevy monza 5.7L/TH350/Auburn 3.08 posi - Next |
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#15 (permalink) | ||
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Cunning Linguist
Join Date: Mar 2002
Location: Plano, TX 75074
Posts: 4,430
Real Name: Otto
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1960: ♥ '61 Rekord PII 1.7 3S 3.9 ♥ '69 Kadett LS 'sprint' 1.9 3A 3.18 1970: ♥ '70 GT 1.9 4S 3.44 ♥ '72 GT 2.2SSD 5S 3.44 ♥ '72 GT 2.4FI 5S 3.44P 1980: ♥ '85 Bitter SC 3.9FI 5S 3.44P 2000: ♥ '09 Solstice GXP Coupe 2.0 SIDI VVT Turbo 5S 3.73P |
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#16 (permalink) |
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Opeler
Join Date: May 2006
Location: Hudsonville, Michigan, USA
Posts: 1,794
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Yes, I know how it all works, mostly. I just wonder how much temp control will be lost if the heater valve is a solenoid switch which is either open or closed instead of having a partial setting. I'd think that even a partially open valve would allow the pressurized coolant to completely feed the core. Quite likely I'm wrong. I'm thinking of a garden hose, put your thumb over the end to block it to half it's original opening size and it just comes out faster, the volume of liquid getting through doesn't change much, right? So I'm thinking a partially open heater valve doesn't do much to effect the temperature in the end, the air flow valve does more, the pressurized coolant is much dissuaded by a partially opened valve.
Since DESTEC has done it, maybe he'll chime in.
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"Being ignorant is not so much a shame, as being unwilling to learn." Benjamin Franklin |
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#17 (permalink) |
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tomking
Join Date: Aug 2002
Location: SW Missouri
Posts: 1,278
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thumb over the end to block it to half it's original opening size and it just comes out faster, the volume of liquid getting through doesn't change much, right? So I'm thinking a partially open heater valve doesn't do much to effect the
Wrong! The volume changes too. that is why you can modulate the temperature inside the vehicle by opening or closing further this valve.
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TMK |
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#18 (permalink) |
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Opeler
Join Date: May 2006
Location: Hudsonville, Michigan, USA
Posts: 1,794
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Okay, but even if the volumn drops won't the core soon be as hot with say 5 gallons/minute running through of 200 dergree coolant as it will with 7 gallons per minute of 200 degree coolant. I'm just not convinced that a moderate change in volumn, once things are all heated up is going to change the temp coming through the vents in the car but I readily admit I don't know squat about this stuff. It does matter though because if I opt for an electric valve and I'm wrong and I can't control temp then I'll be grumpy.
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"Being ignorant is not so much a shame, as being unwilling to learn." Benjamin Franklin Last edited by jvandyke; 02-14-2007 at 10:39 PM. |
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#19 (permalink) |
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6,000 Post Club
Join Date: Aug 2002
Location: Imperial Beach, CA South of San Diego
Posts: 6,054
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Remembering when I changed the control panel from the original plastic to the aluminum one from OGTS and having the complete heater package out of the car, the heater control lever for the coolant had an additional cable on it. So I'm gonna presume Otto is correct in that the second cable also controlled the incoming air flow through the core as well as the water temp valve. So, that being said, it would appear you would need both the water temp valve working, either by cable, vacuum or electricly, and still use the second cable on that lever for air flow control. This is getting to be mind boggling.
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Ron 72 GT 3.4L V-6/T-5/ZF posi - almost done - Just need AC installed. ![]() 75 Chevy monza 5.7L/TH350/Auburn 3.08 posi - Next |
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#20 (permalink) | |
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1000 Post Club
Join Date: Apr 2003
Location: Overland Park KS
Posts: 1,998
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For what its worth,if you want heat...peel up the insulation around the tranny tunnel ..now that is heat!I have flushed my heater core and put in a new valve...i dont get much heat at full on..i cant see that there is much to be gained by a valve with variable adjustment... although...my old mantas had great heat...you could tweek the valve just a bit and you could control it precisely
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Thank you members of opelgt.com for helping me on a 5 year reconstruction of the most beautiful car in the world Celeste: 1917,cc ,getrag resealed, 2liter Intake valves,ported,ISKY cam on solids,Opel forged rods,9.52 compression,total seal gapless,oil dam,RB gasket mod., DCOE side drafts,sprint,2in straight exhaust,pertronix,OMNI paint,SACHS clutch,OGTS & Kadette sway bars,Manta finned pan,3 V clock,Ball joints and Poly all... SAA-WEET! |
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#21 (permalink) | |
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Über OpelGT.com Moderator
Join Date: Mar 2002
Location: Calgary, Alberta, Canada
Posts: 4,079
Real Name: Keith Wilford
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Think of your engine and radiator. If it didn't matter how much coolant was pumped through the engine you would need a pretty tiny water pump. Heat transfer is a function of: 1) approach temperatures (the difference between the two objects, in this case the coolant and air temperatures) 2) the heat transfer coefficient (the "effectiveness" of how heat is conducted, or convected, from one object to the other) 3) mass flow rate (how MUCH heat can be brought in, and taken away) This is the "volume" of heat, NOT the temperature. To heat up the air inside your cold car, you need LOTS of heat transfer. Not just a small amount of very hot air, but LOTS of VERY hot air. So lots of hot coolant, and lots of air to be heated. Conversely, if you just need a "bit" of heat, you REALLY need to be able to control the coolant flow (since you have NO control of the coolant temperature, as that is determined by the engine thermostat), and to a lesser degree, the amount of air flow (for example, by the fan speed). The GT heater system also includes an air bypass (ie cold air) around the heater core as the temperature control is slid towards the cold side, effectively reducing the heat transfer from the core, making the temperature control more effective. You'll see this when you take your heater core box apart, which you will have to do to repair your squeaky fan. The cables are a bit complicated, but when set up, work VERY well. One controls the heater valve with a second cable on the same slider controlling the bypass air. The other controls the position of the air flow (to the floor, to the defrost ducts, or a combination). Oh, and pay heed to the advice to look closely at your heater slide control. They are almost AWAYS broken, thereby eliminating the proper function of either the valve, bypass or position. I was able to fix mine with an aluminum plate and some pop rivets, but usually they are too damaged to repair. The OGTS aluminum replacement is a bit pricey, but well worth the $ HTH
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Keith Wilford working on my '71 GT and '75 SportWagon |
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#22 (permalink) |
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Opeler
Join Date: May 2006
Location: Hudsonville, Michigan, USA
Posts: 1,794
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Alright, it seems the consensus is that the heater valve which is variable via the temp slider does assist significantly with temp control along with the air bypass valve with runs off the same lever (all of this I'm well familiar with since I've been playing with my spare). With this in mind I'll reinstall a mechanical and therefore variable valve as the Opel gods intended.
BTW I got pretty far taking apart my dash last night, got the instrument cluster "pulled away" from the dash, too many wires and junk to try and remove it completely. I think I can get done what I want to get done (pull, fix and reinstall the entire heater assembly) and put in a new stereo, fix and reinstall the original Keintzle (sp?) clock and possibly set up the defrost rocker switch to control my electric fuel pump-what else should I do in there?) My concern (to get back on topic) is that an OTGS stitched vinyl dash cover has been installed. It looks nice and is well done but has created problems in removal of dash (or so it would seem so far). Somewhere I read that the heater assembly can be removed and reinstalled with the dash pad still in the car. Does anyone know if this is indeed possible? (I have a feeling I'll be able to answer this question myself in a day or two )PS both my current control sliders, and the ones on the spare assembly are intact (piece of plasic edge on face plate is broken off the in-the-car-one). But both temp sliders would only go half way, the reason is both had issues with cables, one had a big kink in the one that controls air valve (so heater valve was also unable to be used) and the other seems to be seized somewhere in the one to the heater valve. At the moment I'm planning on building the best unit-; fan motor, core, controls, case, cables I can out of the two.
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"Being ignorant is not so much a shame, as being unwilling to learn." Benjamin Franklin Last edited by jvandyke; 02-15-2007 at 09:59 AM. |
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#23 (permalink) |
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6,000 Post Club
Join Date: Aug 2002
Location: Imperial Beach, CA South of San Diego
Posts: 6,054
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First off the dash has to come out for the heater box removal. So that means the instrument panel as well. Here's the drill for the instrument panel removal, and you appear to be half way there. Disconnect the plugs at the fuse panel. for the steering column and panel. Drop the steering column, 4 bolts. Two bolts behind the panel down low, there is a plug on the pax side of the dash to remove that bolt (8mm head), remove the turn signal flasher can, driver's side behind the panel. Remove seven screws that hold the panel ( you've already done that). Disconnect the speedo cable and antenna from the radio. Gently work panel loose from the dash being careful of the protrusions where the screw nut plates are attached. The panel is old and may be brittle so extreme care is required in removing it. There will also be an odd wire or two that has to be disconnected. For the dash, 2 screws by each door jam and 6-7 at the base of the windshield. I would suggest using an Exacto knife, carefully feel for the depressions where the screws are in the dash at the windshild and make a small "X" over each screw head, that will allow a #1 stubby Phillips screwdriver or a flex drive to access the screws. You can get dimpled washers to put on the screws to cover the cuts in your dash cover. The dash will be difficult to remove, the two air vents in the dash have hoses attached to the intake air plenum and hoses from the heater box to the duct for heat and defog. But they are visible after the instrument panel is removed. HTH.
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Ron 72 GT 3.4L V-6/T-5/ZF posi - almost done - Just need AC installed. ![]() 75 Chevy monza 5.7L/TH350/Auburn 3.08 posi - Next Last edited by namba209; 02-15-2007 at 01:37 PM. |
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#24 (permalink) |
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1000 Post Club
Join Date: Dec 2002
Location: League City Texas
Posts: 1,113
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I have found that the front panel removal is much easier if the two dash screws on eithe side of the dash by the door are removed. You then have a certain amount of lift on the dash and helps the panel slide out much easier. You have dropped your steering wheel- haven't you?
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Texas Opel Preservation Society |
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#25 (permalink) |
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Opeler
Join Date: May 2006
Location: Hudsonville, Michigan, USA
Posts: 1,794
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Yep, dropped the column last night too. I'm following FSM on this (but it is the '73 edition, I've got a '70).
I was happy to see the tear bolts were gone!!! but it still gave me a bit of grief, one of em didn't want to let go. No big deal. So far all has gone well, no reason to suppose that the total removal shouldn't go equally as well. (that's about the time it all blows up, ain't it? Mr. Murphy?)
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"Being ignorant is not so much a shame, as being unwilling to learn." Benjamin Franklin |
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