Question about 1990 GMC Sierra

2 Answers

No power to the heating and air conditioning controls

I have a 1990 GMC Sierra that has no power going to the controls for the heating and air conditioning. I checked the fuse and it was fine, replaced it anyways but still no power. Not sure if it is related but the battery was dead so we had to jump it to get it going. New battery but every once in a while (if not driving every day) the battery drains.

Posted by on

  • Anonymous Dec 09, 2008

    i have a 1990 gmc and the blower motor went out so i bought a new one and now the control panel will not work for the heat and a/c i got a new one and it still will not work the wires got hot and had a small fire that is why i had to replace the blower motor so do not know if the wires got burned somewhere from the blower to the control panle are not



2 Answers

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

To answer you draining power problem, check your altinator, it can be on its way out

Posted on Dec 28, 2008

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 585 Answers

Folliottfami:I take you to mean that the blower just does not run. Your problem may have something to do with the motor being bad, or a wire or terminal between the relay/resistor and the motor breaking down and maybe burnt off. I can't say what is draining your battery though. Those problems usually stem from a light, such as the one in the glovebox, staying on.

Guest:: your problem may be similar. Inspect the wires and terminations in the area of the relay/resistor assembly.

Posted on Dec 19, 2008


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

My 2003 sierra is blowing hot air on drivers side and cold on passenger side how do i fix

Sounds like one of the blend doors is stuck or not working. Try and pinpoint the door by playing with the controls. May need to purchase a actuator, the part that powers the door to open and close,

Aug 03, 2014 | 2003 GMC Sierra 1500

1 Answer

My 1990 GMC Sierra 1500 ha a problem with the

You need to get the hinges on the door fixed. The bushings are worn out causing the door to sag. See a body shop.

Mar 01, 2010 | 1990 GMC Sierra

2 Answers

2005 GMC Sierra 1500 - heater blows, but only cold air

Check coolant level. Check for heat at the heater hose going from water pump to heater core at firewall. Check to see that cable is moving coolant control valve from the closed to open position. Low mileage so it shouldn't be plugged heater core.

Jan 07, 2010 | 2005 GMC Sierra

1 Answer

I have a 1990 gmc with air pump question

well the air pump is used to reduce emmissions it sends fresh air into the cylinder to help reduce the exhaust gases.....if your looking for more power you should be fine........have fun and good luck

Nov 30, 2009 | 1990 GMC Sierra

1 Answer

Air blend door

Replace the broken actuator.

Apr 15, 2009 | 2004 GMC Sierra

1 Answer

1990 gmc 305 where is the Idle Air Control located

The iac motor is on the throttle body It screws into the passenger side of the throttle body. It has a hex on it to put a wrench on. It's about 1" to 1 3/16" in size,(the hex) can't miss it.

Feb 16, 2009 | 1990 GMC Sierra

2 Answers

2005 GMC air conditioning

you need to have the actuators reset you can try unhooking battery again if not it will have to be done by the dealer

Sep 22, 2008 | 2005 GMC Sierra

2 Answers

Air conditioning

Check for a broken or loose vacuum hose under the hood also........

Good luck........

Jul 27, 2008 | 2002 GMC Sierra

2 Answers

Air conditioning and heating controls

heater is unpleged cheak with car heater is pulged are unpleged

Jun 06, 2008 | 2002 GMC Sierra

Not finding what you are looking for?
Cars & Trucks Logo

124 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts


Level 3 Expert

81400 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

Ronny Bennett Sr.
Ronny Bennett Sr.

Level 3 Expert

6927 Answers

Are you a GMC Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides