mixalive

My C68 Electronic Climate Control system on my 92 has stopped working. I know my freon has been low for a while, but just wanted to wait until summer to recharge. But all of a sudden, no blower, no AC, no heat.
Can anyone tell me where the blower fuse is in a 92? Couldn't find it at the blower. I checked the AC fuse in the fuse panel and is good.
I am wondering if the freon gets too low that the entire climate system gets shut down. Any help would be appreciated.

Cliff Harris

Pull the diagnostic codes out of the unit by following the links in this thread:

http://forums.corvetteforum.com/c4-t...stic-mode.html

mixalive

Thanks.. That is great info.. I am still looking for the blower fuse.

Hooked on Vettes

If you have a low freon code 09 the ac compressor clutch won't engage.
Heat and blower motor will continue to work.

If your problem is the blower motor is not working and you can
manually increase and decrease the blower speed 1-10 from
the HVAC control head something is wrong with the blower motor
or the blower motor control module.

To verify the blower motor is good or bad, with the ignition OFF
apply a 10 amp fused 12 volts direct to the Purple wire at the electrical connector of the blower control module on top of the evaporator housing.

If the motor works, you need to take some voltage measurements
at the blower control module.
.
The blower control module has two electrical connectors.
A 2 pin and a 4 pin electrical connector.

On the 2 pin connector is a red wire which should measure 12 volts
and is hot all the time.

On the 4 pin connector are 3 wires.
Black is ground.

With the ignition ON measure the voltage on the Purple wire.
Purple wire is the voltage from the blower control module to
drive the blower motor. This voltage should vary from
about 7 volts to 12 volts depending on the blower speed
selected. If the voltage is not correct the blower motor control
module is probably bad. If the voltage is correct the blower
motor should run.

A Tan or it could be a Yellow/Green wire is the voltage
from the programmer and is the input to the blower control
module. This voltage will vary from about 2 volts to 6 volts
depending on the blower speed selected. If no voltage the
programmer is probably bad.

If the 5 amp AC MDL fuse was bad/blown the blower
motor would run full speed when the fan is on.
So a blown fuse can't be the problem.

Here's a picture of the blower control module.

482vranger

Dont know if this is your problem, but mine quit working correctly. Too much Armoral on the buttons. Took it out, cleaned the little contacts behind the buttons with alcohol, and it worked fine. Hope this helps.

mixalive

This is just the type of info I was looking for.. Thanks guys..

mixalive

Just an update:

12V directly to the blower with 10amp fuse in series blew the fuse.

Voltage to red wire at the control module = 12V all the time. Verified
Voltage off the purple wire at the control module (blower out of the circuit) = 7 - 12V on manual and automatic blower control. Verified

My compressor is engaging with AC on and can feel cool air being generated, so that is all good.

Looks like my blower motor is toast.

Any suggestions for a replacement?

Hooked on Vettes

Pull the motor out and verify a rodent hasn't built a
nest in there preventing the motor from spinning.

Any brand should work. You'll need to transfer the
squirrel cage over to the new motor.

mixalive

My cats better hope there are no rodents in there. They be laying down on the job..

mixalive

I installed an Everco (made in Canada) unit from AutoZ this past weekend. $29.99. It is the same one CC sells for $44.95. Easy install and works great. My old blower motor was froze up and resistance was 0. Dead short. It is crazy that a dead short did not blow a fuse in the cars circuit. I am guessing the big resistor was taking the load. But I am wondering if the dead shorted circuit would have caused the ECM some confusion as I had an episode where it appeared the Optispark was failing. But only when the shorted blower motor was connected and energized. Crazy..