1992 Pontiac Transport fan on front system not working

Tiny
ED DOEBLER
  • MEMBER
  • 1992 PONTIAC TRANSPORT
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 149,000 MILES
The front ac blower is not working but the switches are on and fan indicator lights are on and indicating that everything is find. At the same time the rear AC is running just find and nice and cold. The fan has been jumpered and works fine. The relay been replaced along with the fuses. We also replaced the speed control relay for the fans speed that is located in the air box next to the fan. Is there any thing that I have missed that is in line some where. The Haynes does not have to much information on AC units in them.
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Thursday, March 26th, 2009 AT 12:13 AM

3 Replies

Tiny
ZACKMAN
  • MEMBER
Can you pull the wiring harness from the blower motor assembly and check the voltage on the harness? I think you have circuitry problem.
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Saturday, March 28th, 2009 AT 12:22 AM
Tiny
ED DOEBLER
  • MEMBER
My Quetion:

Air Conditioning problem
1992 Pontiac Transport 6 cyl Front Wheel Drive Automatic 149000 miles

The front ac blower is not working but the switches are on and fan indicator lights are on and indicating that everything is find. At the same time the rear AC is running just find and nice and cold. The fan has been jumpered and works fine. The relay been replaced along with the fuses. We also replaced the speed control relay for the fans speed that is located in the air box next to the fan. Is there any thing that I have missed that is in line some where. The Haynes does not have to much information on AC units in them.

Your answer was:

Can you pull the wiring harness from the blower motor assembly and check the voltage on the harness? I think you have circuitry problem.

Questions:

1. Do you have a wiring diagram on this unit in all your technical manuals you have?

2. What other components are in the system that would make this happen after the ones I mentioned in my note to you?

3. What volts and amps am I am looking for at the motor?
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Saturday, March 28th, 2009 AT 9:23 PM
Tiny
ZACKMAN
  • MEMBER
1. Wiring diagram. I will email you the diagram as well. It looks better with Windows Photo Gallery.


http://www.2carpros.com/forum/automotive_pictures/55316_92transportac1_1.jpg



http://www.2carpros.com/forum/automotive_pictures/55316_92transportac2_1.jpg



http://www.2carpros.com/forum/automotive_pictures/55316_92transportac3_1.jpg



2. Here is the diagnostic steps to check the blower motor.


http://www.2carpros.com/forum/automotive_pictures/55316_92transportac01_1.jpg



http://www.2carpros.com/forum/automotive_pictures/55316_92transportac02_1.jpg



http://www.2carpros.com/forum/automotive_pictures/55316_92transportac03_1.jpg



3. Just battery voltage. 12.6 volts. Don't worry about the amps.
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Monday, March 30th, 2009 AT 7:16 PM

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