1994 Buick Lesabre Heater won't turn off

Tiny
OREGONJOHN
  • MEMBER
  • 1994 BUICK LESABRE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 143,000 MILES
I saw another post that tried to answer this question. My heater fan stays on after I turn off the car. "Mastertechtim" answered with a diagram which was very helpful but like the other guy I already pulled all those relays and none of them shut off the heater. It shuts off if I pull the 30 amp fuse. Also, the diagram shows 8 relays. I only have the 2 on the right and the 4 on the left with 2 empty spots in between. I don't work on cars much so if you answer assume I am ignant and explain it fully and describe the part if you could. This does have a climate control. The service engine soon light is on and I know I need a new AC compressor. I just don't want to put the money into the compressor ($900 installed) if I can't fix the heater. The rest of the car is in awesome shape and I got areally good deal on it but may have to sell it if I can't afford to fix this because I am very limited on funds. Thanks.
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Sunday, September 20th, 2009 AT 5:35 PM

5 Replies

Tiny
RASMATAZ
  • MEMBER
If you're talking about the no. 3 30amp fuse get the blower motor control module at center rear of engine compartment checked out could be shorted out or the red and purple wire in the wiring connector is shorted together that will cause the blower motor to run continously w/o the use of the key
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Monday, September 21st, 2009 AT 3:43 PM
Tiny
OREGONJOHN
  • MEMBER
How do you "check it out"? Is this the thing on top of the heater box under the fuse and relay unit? I followed the wires from the blower motor to it. I unplugged it and the blower shut off so I guess this is it? How do I remove it? Do I have to try to follow the wires and disconnect them somewhere? Is the whole thing one unit when you get a new one (the plug part and the part it plugs onto)? Sorry I know it's got to be rough talking to someone who just doesn't work on cars. And if this isn't the problem, I still don't know where the resistoris and what it would look like. I also called about the control module. They want $203 at NAPA. Does that sound right?
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Monday, September 21st, 2009 AT 4:07 PM
Tiny
RASMATAZ
  • MEMBER
The blower motor control module is on right side of firewall near the blower motor it should have this wires on it 4 pin connector: purple, gray and black, black and red wires
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Monday, September 21st, 2009 AT 4:21 PM
Tiny
OREGONJOHN
  • MEMBER
What I described to you is the only thing that has wires connected to the blower motor. It has two connectors. One oblong and one bigger square one. What I think is the module is mounted with two screws on top of the heater box. Like I said thisis the only thing with wires that goes to the blower.
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Monday, September 21st, 2009 AT 5:00 PM
Tiny
RASMATAZ
  • MEMBER
That's it-it feeds the power input to the blower motor

The red wire comes from the no.3 30amp and its hot all the time
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Monday, September 21st, 2009 AT 5:15 PM

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