No Power to heat/AC or rear Defroster
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New Member
Joined: Oct 2013
Posts: 14
From: CT
No Power to heat/AC or rear Defroster
I have a 2010 GE8 , 180k on it.
I've been having some electrical issues- My fan control does nothing and my AC button does not light up, nor does the rear defroster button.
Issue has been intermittent for about a year and resulted in bringing it to the dealer even to try and find the issue- of course everything worked fine once they started checking it out.
Other odd symptoms:
-intermittent SRS light, dealer says my driver side seat airbag is faulty
-A while ago I was getting a bunch of clicking from under the dash by the fuse box, sounding like a relay wildly run away, systems worked for a while since I heard the noise
For the last month or so it has stayed dead and not come back.
-Blower motor is a few years old and I suspect is fine
-Ive replaced both defrost and blower fan relays under the dash in the fuse block
-Replaced the two blower motor fuses last week
-Replaced the Blower motor resistor last week
-I reached up and tightened the ground behind the left side of the dash that the service manual specifies- I can't remember the code for it- I was only able to get a wrench on it and not take it off and clean it- this ground is the ground for the defrost and blower motor
Anyone have any ideas? Seems like a relay or ground issue, and I don't see anything upstream in the wiring that would impact both ac fan and defrost except the ground wire.
Next step: Apply voltage directly to the blower motor, Test the current relays , bring it to the dealer.
I've been having some electrical issues- My fan control does nothing and my AC button does not light up, nor does the rear defroster button.
Issue has been intermittent for about a year and resulted in bringing it to the dealer even to try and find the issue- of course everything worked fine once they started checking it out.
Other odd symptoms:
-intermittent SRS light, dealer says my driver side seat airbag is faulty
-A while ago I was getting a bunch of clicking from under the dash by the fuse box, sounding like a relay wildly run away, systems worked for a while since I heard the noise
For the last month or so it has stayed dead and not come back.
-Blower motor is a few years old and I suspect is fine
-Ive replaced both defrost and blower fan relays under the dash in the fuse block
-Replaced the two blower motor fuses last week
-Replaced the Blower motor resistor last week
-I reached up and tightened the ground behind the left side of the dash that the service manual specifies- I can't remember the code for it- I was only able to get a wrench on it and not take it off and clean it- this ground is the ground for the defrost and blower motor
Anyone have any ideas? Seems like a relay or ground issue, and I don't see anything upstream in the wiring that would impact both ac fan and defrost except the ground wire.
Next step: Apply voltage directly to the blower motor, Test the current relays , bring it to the dealer.
New Member
Joined: Oct 2024
Posts: 4
From: Kentucky
Definitely check on that relay. If you have a 9v battery, try energizing the control terminals with said battery. If you hear a click you might be alright. If you have a multimeter check across the live terminals for resistance. If theres too much resistance your relay is definitely the issue. Relay sperging out indicated to me it might be the culprit.
Lemme know what you've found since posting. Let me know if any of this helps
Lemme know what you've found since posting. Let me know if any of this helps
New Member
Joined: Oct 2024
Posts: 4
From: Kentucky
Definitely check on that relay. If you have a 9v battery, try energizing the control terminals with said battery. If you hear a click you might be alright. If you have a multimeter check across the live terminals for resistance. If theres too much resistance your relay is definitely the issue. Relay sperging out indicated to me it might be the culprit.
Lemme know what you've found since posting. Let me know if any of this helps
Lemme know what you've found since posting. Let me know if any of this helps
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