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I have nice frosty cold air just trickling out of my vents
Upgrades I've done:
New Sanden compressor w/R134 conversion
Cleaned up duct work and sealed.
C4 fan upgrade (cleaned out box at same time)
I'm getting 12.8 volts to the fan?
I know DC motors will spin faster with more voltage.
What's the MAXIMUM I can dare send that sucker and how do I step up voltage?
I have a new pigtail from the motor to the relay.
I've heard talk of this...but I'm not real good at electronics.
Could you explain it better?
I'm looking to blow my wig off
You can give it more power but the motor can't take it if it is not able to pass it to ground. By increasing the size of the ground wire the power - Amps and Volts - you give it can give the motor more to use.
The blower motors were used on lots of GM cars but most were metal cars so the ground was huge compared to the little ground wire the fiberglass car has.
Add an additional ground to the connector you have on the new C4 motor and see what you get before anything else. Search this forum for how to do it.
Also can you close the passenger side ball vent to let more flow go to you driving?
Well, mostly people concentrate on the positive wires. Corvettes, because they are fiberglass are ground challenged, every electrical component must be grounded to work. From the factory these cars had a 12 gauge positive wire to the fan, but only a 16 gauge ground that is quite long and eventually ends up near the starter grounded to a bell housing bolt or similar. Installing a 12 gauge ground wire from the fan motor to the engine block will give the fan motor a better path to ground and increase the speed.
What year car? Be sure the vacuum system that works the vents to divert air to the vents you want is working. Maybe the air is blowing at your feet when you want it on your face? There is an air valve that sometimes goes bad connected to the A/C lever adjuster in some cars. Easy to change out and not expensive.
With the year Willcox can let you know more about that and sell the parts needed.
What year car? Be sure the vacuum system that works the vents to divert air to the vents you want is working. Maybe the air is blowing at your feet when you want it on your face? There is an air valve that sometimes goes bad connected to the A/C lever adjuster in some cars. Easy to change out and not expensive.
With the year Willcox can let you know more about that and sell the parts needed.
I agree if you have not removed/replaced/cleaned, evporator and heater core, that is the problem,
they become very clogged after 40 years or so !... not a fun job either ! good luck !
I agree if you have not removed/replaced/cleaned, evaporator and heater core, that is the problem,
they become very clogged after 40 years or so !... not a fun job either ! good luck !
I replaced my heater core less than a year ago....saw no blockage there...
When I put in my new engine I removed the heater hoses all together.....don't need heat.
Is the evaporator in the box with the blower motor?
What's the best way to clean that out?
the evaporator is very similar to heater core, in function and design, and size.
(except it is cooled instead of heated, and the air flow should blow thru it.)
so if you installed a new heater core, how is your air flow thru the heater ?
If it is good, this would indicate the evaporator is clogged.
Evaporator is located inside the box in the Engine Compartment, next to the Fan motor
I do not think you can access it, with your AC system together.
" cleaning the evaporator box area" this will clean out the 40 years of crap laying in the box and may help,
IF you want the full effect, your evaporator unit will need cleaned or replaced, it will be clogged up, after 40 years.
best time to do this is when engine is out, you missed that oppurtunity.
you may think you don't need heat, but their will be days you will need defrosters/Heat.
and all of this assumes your vacuum controls are functiuoning properly and opening the correct doors fully.
the evaporator is very similar to heater core, in function and design, and size.
(except it is cooled instead of heated, and the air flow should blow thru it.)
so if you installed a new heater core, how is your air flow thru the heater ?
If it is good, this would indicate the evaporator is clogged.
Evaporator is located inside the box in the Engine Compartment, next to the Fan motor
I do not think you can access it, with your AC system together.
07-08-2014, 09:06 PM
I want a LOT more air flow from AC!
