Question about 1990 Chevrolet K1500

1 Answer

Heater wont work in my 1990 Chevy Truck

My heater in my 1990 Chevy truck only blows cold air.

Posted by on

  • griselda_bar
    griselda_bar Dec 27, 2008

    Where can I locate the coolant valve nd where do I locate the damper in duct?

  • Anonymous Feb 14, 2009

    I have a 1995 Chevy Tahoe 350 and I cant get the heat to come on. Already replaced the water pump and thermostat, however it is still blowing out cold air. Help!?


1 Answer

  • 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
  • 405 Answers

Several things can cause this (1) low coolant (2) bad coolant valve to heater core.(3) bad damper in duct.

Posted on Dec 27, 2008

  • 2 more comments 
  • David Johnson
    David Johnson Dec 27, 2008

    Most likely low coolant level, most common problem.

  • David Johnson
    David Johnson Dec 27, 2008

    The heater control valve will be under the hood inbetween the heater core and the engine, probably vacuum operated, and you should be able to see it move it it is working. The damper for the heater a/c is used to deflect the blower air over the correct coil. it will be locate in front of blower in the duct and will be actuated with vacuum, a cable or and electric motor.

  • Chuck Hurley
    Chuck Hurley Dec 11, 2013

    I have a 1991 Chevy 1500 and everytime I turn on or off the truck I hear clicking from the air duct and my heat wont work.

  • Chuck Hurley
    Chuck Hurley Dec 11, 2013

    To finish my question. The hoses to and from the heater core are hot so it's getting the coolant.


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

a 6ya expert can help you resolve that 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.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


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



Related Questions:

1 Answer

Heater blows cold air

looking for a n acuater(heater valve0

Nov 10, 2013 | Chevrolet Celebrity Cars & Trucks

2 Answers

Heater doesn't get hot on 96 chevy truck. Blows good, just cold. Replaced thermostat, flushed radiator. Any ideas?

Air Temperature Control Blend Door Failure No Heat or no AC (dependes on where door sticks)

In all modern cars there is a tiny DC electric motor driven gear drive that moves a plastic door that blends heated and cooled air from the AC and the heater core, this is called (interestedly enough) the air temperature control blend door actuator. The motor that moves this door fails because the door starts sticking from warping, most common complaint is no heat but it can be no AC as well. To replace these parts (blend door and blend door actuator) you must remove the entire dash from the car. Always have this problem confirmed by a dealer or qualified repair shop as it is a very expensive repair.

Other causes of no heat in the cabin are engine thermostats that are stuck open (engine runs cold) or air bubbles in the cooling system.

Dec 06, 2012 | Cars & Trucks

1 Answer

Heater is blowing cold air. I have a chevy 2001 silverado extended cab, long wheel base. what could cause this?

My truck had the same issue and from I have read, it is pretty common. I just felt the heater hoses under the hood. If there is one hot and one cold, with the engine running and the heater set to maximum, rapidly squeeze and release the hot hose for about fifteen seconds.I just did this to my truck and it "Burped" the heater core. I got instant LAVA HOT air!! I hope this helps.

Dec 02, 2010 | 2001 Chevrolet Silverado

2 Answers

I have a 91 chevy truck that has started blowing

try to check the fluid level or change thermostat

Feb 25, 2010 | 1991 Chevrolet C1500

1 Answer

I have a 1994 chevy 1500 blower works full of antifreeze and hoses get tight when truck is warm but blows only cold air

if your truck is not overheating and shows no other signs of a cooling system problem, i would suspect a clogged heater core. you can try to flush it out by removing both heater hoses from the heater core, and with a garden hose, flush the core in both directions

Dec 06, 2009 | 1991 Ford F150

1 Answer

My truck is blowing cold air, on

Heater core would be your best bet, also check to make sure that the door inside the ductwork is actually moving from the cold air side the the hot air side. If you have the manual lever you should be able to feel it moving, if it's vacuum operated you should hear the air flow change as the door is moved.

Nov 09, 2009 | 2000 Chevrolet S-10

2 Answers

'98 Chevy S-10 Pickup heater blowing cold air

the temp door is located in a box behind the glovebox, the actuator is either under or above the box. if you remove the glove box you should be able to see it.

Feb 01, 2009 | 1998 Chevrolet S-10 Pickup

2 Answers

Heater blows cold on 02 chevy silverado 1500 4.3 V6

i had the same problem with my 2000 chevy truck!! i took both hoses off engine and flushed the heater core with water and air frome air compresser,added new coolent and it works perfect!!!! so try flushing your system............

Nov 17, 2008 | 2002 Chevrolet Silverado 1500HD

Not finding what you are looking for?
1990 Chevrolet K1500 Logo

1,344 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts


Level 3 Expert

70347 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22041 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

6876 Answers

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

Answer questions

Manuals & User Guides