94 Blower motor question
Thread Starter
Racer
Joined: Apr 2004
Posts: 482
Likes: 0
From: Wilmington NC
94 Blower motor question
Hello all,
The AC/Heater blower motor only runs in the low speed range in my 94, the vent doors are operating correctly and I have replaced both relays.
When I switch the AC between closed & open to outside air setting there is no difference in the fan speeds.
Any ideas?
The AC/Heater blower motor only runs in the low speed range in my 94, the vent doors are operating correctly and I have replaced both relays.
When I switch the AC between closed & open to outside air setting there is no difference in the fan speeds.
Any ideas?
Le Mans Master
Joined: Dec 2000
Posts: 7,839
Likes: 22
From: San Diego, Ca
Fan speed is controlled by a Module bolted to the left side of the Evaporator Case. It gets low voltage signals and amplifies them to control blower speed. That input is usually a Brown or Tan wire and it should have 2.5 volts at 1; 6 volts at 10. Output is Purple or whatever is hot at the Blower. 1 should produce 4 volts, 10 12 volts. If it has the input but the output doesn't change, replace the Module (which is all most always the problem). If it doesn't have the inputs, either your Controls aren't sending them to the Programmer (the Processor which then relays them to the Module) or the Programmer isn't working. Use a bi-directional scanner through the CCM link to find out which one.
