Heat isnt working on my 94 GMC Suburban. Changed thermostat. I have a "ticking" coming from under dash on pass. side when I hit the max button on controls. It also "ticks" when car is turned on/off.

60

Asked by Jan 11, 2015 at 08:07 AM about the 1994 GMC Suburban K1500 4WD

Question type: Maintenance & Repair

7 Answers

8,060

Blower shaft bushings dry or need replaced. runs with key power and speed increases when blower speeds are selected. could be. Max would actuate fresh/recirc door above it. If your temp. blend door does not move, and is turned away from heat setting. look at the control for it. if you have a blend door actuator, it could be stuck. Loss of vacuum would give defrost all the time. so when you say heat isn't working ? what does that mean ? no air flow ? cold airflow ? airflow to the windshield only ? seems like you best get it looked at. that would save you money and time. Or you could do some checks and more fully describe after reading this.

1 out of 1 people think this is helpful.
Best Answer
60

Air flow comes out right on each setting; defrost, dash vents, floor vents. The air temp itself does not blow hot on any setting.

2 out of 2 people think this is helpful.
8,060

Then if your coolant is full, and your heater hoses both feel warm, You must have a temp. blend door stuck not allowing the air to pass over the heater before it leaves the case. it could be obstructed, stuck, or the actuator could be out of position or out of range.

1 out of 1 people think this is helpful.
60

What's the best way to get at the blend door?

2 out of 2 people think this is helpful.
108,835

www.youtube.com/watch?v=Ow0OOfIFtlU --- this should give you a basic idea... Just when you get in there replace the one that's ticking cause it's stripped out probably.

2 out of 2 people think this is helpful.
60

Thanks for the help guys. Found a video from someone that had the same problem and he shows how to fix it.

1 out of 1 people think this is helpful.
20

There's an acutator behind the glove box that needs replacing feel it when you hear it under dash

2 out of 2 people think this is helpful.

Your Answer

Add photo

Related Questions

  • why is my gmc suburban temp gauge fluctuating 10 answers

    a few days ago my temp gauge started to fluctuate and at times goes in the red zone and the check gauges light comes on and i get no heat, then it goes back down and i get heat. at times it stays stea...

    1996 GMC Suburban K1500 4WD

    -

    Maintenance & Repair

  • 1997 GMC Suburban Won't Start.... HELP !!! 4 answers

    ok this started last fall. - the fuel pump went out so I changed the pump and gave it a tune up (new plugs, wires, cap and rotor) then it still would not start, so i changed the crank sensor, cam sens...

    1997 GMC Suburban K1500 4WD

    -

    Maintenance & Repair

  • I need help with a 1993 gmc 5.7L tbi. 24 answers

    Ok, so i have a 93 gmc suburban. I just put a new engine in. It has flat top pistons running about 9.2 to 1 compression and an rv cam. The truck itself has about 282000 miles on it. I am having an...

    1993 GMC Suburban K1500 4WD

    -

    Maintenance & Repair

  • won't start,just clicks one time 22 answers

    I go to start it and it doesn't turn over at all it just makes a single click noise. sounds like it is coming from the starter area

    1997 GMC Suburban K1500 4WD

    -

    Maintenance & Repair

  • My 2015 GMC sierra has engine tick 15 answers

    Had my new truck oil changed at dealership at 5000k, it developed a knock in the front end. 3 days later of being at dealership they didn't find out what was wrong but it stopped being noisy. Just h...

    2015 GMC Sierra 1500 SLT Crew Cab 4WD

    -

    Maintenance & Repair

Suburban

Looking for a Used Suburban in your area?

CarGurus has 135 nationwide Suburban listings starting at $3,500.

ZIP:

Search GMC Suburban Questions

GMC Suburban Experts

#1 LouB
LouB
Reputation 1,300
#2 ShadetreeMech
ShadetreeMech
Reputation 190
#2 Larry Thibert
Larry Thibert
Reputation 190
View All

Related Models For Sale

Used Chevrolet Suburban
347 Great Deals out of 19,097 listings starting at $2,295
Used GMC Yukon
356 Great Deals out of 17,256 listings starting at $2,500
Used Chevrolet Tahoe
576 Great Deals out of 27,602 listings starting at $1,500
Used GMC Sierra 1500
810 Great Deals out of 67,001 listings starting at $1,499
Used Ford F-150
2,253 Great Deals out of 209,122 listings starting at $1,499
Used Toyota 4Runner
277 Great Deals out of 20,871 listings starting at $1,995