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Troubleshooting Truck Heater Problems

Category Repair Advice
When your vehicle's heater is not blowing hot air, you need to figure out why not. This guide is about troubleshooting truck heater problems.
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Ask a QuestionHere are the questions asked by community members. Read on to see the answers provided by the ThriftyFun community or ask a new question.

February 7, 20140 found this helpful

I have an 04 Chevy Silverado 5.3 and I'm having heater problems. I'm not getting any air hot or cold blowing out, but when I get on the highway a very small amount will blow out. Days will go by and then out of nowhere the blower well start to work and blow perfectly fine on all speeds for a day or so and then it will stop.

By Andrew S. from Kansas

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February 7, 20140 found this helpful
Best Answer

This same thing was happening in my husband's jeep. It was the heater core that had to be replaced.

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February 10, 20140 found this helpful
Best Answer

Try having this done. Back flush the heater core. It cost me $100.00 to have. I had no heat at all.
I am 79, coming on 80 years old and still learning about a car. I own a
1994 Ford Crown Vic named Louie and he takes me everywhere. Hope this helps! Mrs C.

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By 0 found this helpful
November 6, 2017

I replaced the heater control for my 1998 GMC Sierra 1500, 2w/d, 4.3 eng. The fan works and the directional switch works, but there is still no heat. It just blows cold air.

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November 15, 20171 found this helpful
Best Answer

Our Tahoe was doing this. We added water to the radiator and it started blowing warm air again. My husband told me that if the water/anti-freeze isn't circulating that it will turn on but blow cold because it is not actually reaching the heater core.

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It was a simple fix. If that don't work then try the other suggestions.

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By 2 found this helpful
October 3, 2016

I just had my air conditioner replaced. My heater was working fine before I did. It would get really warm to the point that I would need to turn it down. Now it's blowing little to no warm air. I paid out a lot of money for the air conditioner work, only to have the heater not working all of a sudden. Could it be they did something during the work that would cause my heater to not blow hot air?

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October 17, 20160 found this helpful

My heater stays hot thin back to cold the blower working fine

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November 10, 20140 found this helpful

How do you get to the heat and ac vents that distrbute hot and cold air to the windshield? The hot air and cold air won't blow out of the bottom or windshield vents.

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By Jason

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November 11, 20140 found this helpful
Best Answer

You likely have a broken fan.

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November 23, 20140 found this helpful

I have a 1998 Chevy Z71 1500. My heater won't blow hot air unless I am driving it or giving it more throttle.

By DB

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December 27, 20142 found this helpful

Louise,
After reading several of your "why don't you just take it to a mechanic?" posts I feel compelled to respond. The whole idea behind these sites is to give people with some mechanical aptitude a chance to get advice on their car troubles so they, in turn, might be able to fix them. Labor is generally the most costly part of a bill from a mechanic and in some cases, worth it to have a professional do the work. However, there are many instances in which simple car problems can be handled by someone with some mechanical abilities and a few tools saving potentially hundreds of dollars on a repair bill. I hope this helps you understand the premise behind these sites.

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November 19, 20151 found this helpful

U know its not only needing a trusted mechanic. Its the fact I done spent five hundred dollars getting ac fixed four months ago. For them to spend an hour replacing a 20 dollarpart.now I dont have six hundred for them to fix my heater.

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So thats what these forums r for. Im sure ur son GREAT trust worthy mechanic. But we dont leave near him. So please quit posting ur gp to a mechanic post.. we know this already.

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Anonymous
January 5, 20160 found this helpful

Amen!

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Anonymous
February 5, 20160 found this helpful

Add more fluid and check for leaks

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Anonymous
March 22, 20160 found this helpful

low coolant

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By 0 found this helpful
November 10, 2016

I have a 1993 Chevy truck. I turned my heat on for the first time this year and it blows cold, last year it was hot. I replaced the T-stat and flushed the system with no luck. Is there something else that can be tried before I replace the heater core or should I go ahead and replace it?

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November 24, 20140 found this helpful

My 99 S10 v6 heater/ac blower works well except the fan doesn't blow air/heat on the floor setting or the combination floor/vents. When I put the selector on floor setting, I can hear the "door" directing it to the floor open/close, and the fan running, but nothing is coming out of the floor vents. Also the blower doesn't work on the #1 setting no matter what vent setting. Position 2 - 4 works on all except the floor.

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By Jerry c

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Anonymous
December 1, 20150 found this helpful

Ohh wow! That was extremely helpful!!!! LMFAO!!!!

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August 21, 20160 found this helpful

Check the vaccume hose that activates the vent door for leaks
I have an 07 Chevy van and that was my problem
Only had defroster venting until I replaced the vaccume hose between the intake manifold and vaccume ball
Now all works well again

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October 30, 20110 found this helpful

My truck is a 96 S10 2.2l with a manual transmission. The heater is not functioning. I have flushed and back flushed the heater core already and changed the coolant and flushed it too. So now I don't know what to do. I need help guys.

By Jon P.

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October 31, 20110 found this helpful

Change the thermostat.

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October 31, 20110 found this helpful

I asked my husband and he said the same thing as zoodad, so that is two in favor of so far.

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By 0 found this helpful
December 16, 2010

How do I fix a 2007 Ford Ranger heater? It has been to the shop and they said there was no problem with the heater core, but only a leak. It still does not work.

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By Brenda Harrington

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November 17, 20110 found this helpful

The key is you said it does work once in a while and you arent looking for a short or a switch problem and maybe you should. In the dash because it will work sometime and it wouldn't if the thermostat was closed. Think simple I would buy manual for the year of your truck and start reading. Being a female it was the way I had to learn how to fix my own vehicle. I think you'll find a simple small fix. Shucks guys I have fixed a radiator with a potato before.

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March 6, 20130 found this helpful

Turn your cold to hot mixture knob back and forth and listen for it to open and/or close. Mine puts out either cold or luke warm air. I was pulling a uhaul trailer and the temp never went above low on the guage. When I stopped because I thought I was low on coolant I was able to actually remove the cap and see it was full also put my finger in coolant and it's luke warm. I've changed out the door on a ford RV that one wouldn't move so you wouldn't hear it close. I flushed my system and I will be replacing the thermostat.

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By 0 found this helpful
July 22, 2016

We have a 1997 Ford Ranger pickup. The heater is turned off and the blower is turned off, yet it is still pouring heat into the cab. Any suggestions?

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January 23, 20150 found this helpful

My truck heater blows hard, but does not get hot. If I turn the mix down it gets cool, but if I turn the mix up to total hot it gets lukewarm. There is a new thermostat, new hoses, and new fluid. It just don't get good and hot. The scan shows 180' hoses in and out of the heater core are hot going in an cool coming out. Could it be blocked in the cold hot mix? Can someone help?

By Keith

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January 23, 20150 found this helpful

Perhaps some of the heating elements stopped working?

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September 30, 20140 found this helpful

I have a 2005 Chevy Colorado; it will blow heat and a/c and then it quits after awhile. If I shut the blower off for a little bit it will work again. I don't know what's causing it.

By Tom

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October 2, 20140 found this helpful

I'm not sure, but I too have a 2005 Chevy Colorado, and my blower only works on high. I'm wondering if this is a problem with Colorado's? I've checked for recalls, but have found nothing on this. Hopefully someone else will know the answer to your question... :)

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January 5, 20140 found this helpful

Sometimes it does, but not all of the time. It is just warm, not hot.

By Timothy

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January 6, 20140 found this helpful

Are you low on antifreeze? Could also be a heater core.

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By 0 found this helpful
October 27, 2013

I have cleaned my system out. I have made sure my hoses were not crossed, I have coolant, I have changed my thermostat and I have also made sure my core was not stopped up. I still have no heat, just cold air. I have checked my flap with my knob controls and it opens and closes. What can I do for the problem?

By L.S.

Answers

October 30, 20130 found this helpful

Don't worry about the air duct flap. Find the fluid control valve, that sends hot radiator fluid to the small interior radiator. Most likely that valve is stuck.
On most vehicles that valve is a rotary type valve, and luckily, some WD40 and some energetic cranking back and forth with some vise-grips for a few minutes, will loosen it up. Disconnect the wire or cable pull running to it, before you start forcing it.

If you can't loosen it up, replace it.
Have fun!
DearWebby

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