heater a/c fan upgrade

[azopelnut]

Has anyone retro fit a more modern fan(quieter or more powerful) for either a Opel heater fan or A/C fan ??

[Lindsay]

I looked at smallest (Vintage-Air) A/C & heat combo units, and all appear too large to fit under GT dash. Think if spare tire was removed, combo units might fit in rear deck, but still would have to duct air to front of interior.

What if relay was installed (like headlights?) to supply more voltage to blower motor? More volts may not increase blower output due to blower motor limitations. Should have an extra blower in my parts, will have to take a look at motor.

Does dash pad require removal to remove blower assembly?

[Paul]

I thought that with motors the number of poles of the rotor determines the ultimate rpm of the motor at full voltage. The resistor will drop the voltage and thus reduce the speed. No?

[guyopel]

Yes to be able to remove the complete housing and duct work and cables .HTH
John

[Lindsay]

Originally Posted by Paul I thought that with motors the number of poles of the rotor determines the ultimate rpm of the motor at full voltage. The resistor will drop the voltage and thus reduce the speed. No?

Correct!

Looking at GT schematic for blower wires (Incorrect):
12 GA Black
18 GA Black / Red / White.

Just checked actual early 1972 GT blower motor. 73 GT Blower also is same wiring:
12 GA Red
12 GA Black

[Paul]

What about having the blower rebuilt with a higher number of poles motor.... 6 vs 4, or 8 vs 6... Some of the small motor repair shops might be up for the transplant...

[nobody]

It's actually pretty easy once you have the heater unit out. Just cut the fan section off and replace it with a high CFM pancake style fan. More effecient and quieter, be sure to clean out the heater core inside and out while your at it. That's a trick learned from installing twin carbs.