You likely have a broken fan.
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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
This same thing was happening in my husband's jeep. It was the heater core that had to be replaced.
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.
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.
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. It was a simple fix. If that don't work then try the other suggestions.
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?
I have a 1998 Chevy Z71 1500. My heater won't blow hot air unless I am driving it or giving it more throttle.
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.
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. 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.
Add more fluid and check for leaks
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?
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.
By Jerry c
Ohh wow! That was extremely helpful!!!! LMFAO!!!!
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.
Change the thermostat.
I asked my husband and he said the same thing as zoodad, so that is two in favor of so far.
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.
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.
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.
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?
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?
Perhaps some of the heating elements stopped working?
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.
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... :)
Sometimes it does, but not all of the time. It is just warm, not hot.
Are you low on antifreeze? Could also be a heater core.
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?
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.