Here are the questions asked by community members. Read on to see the answers provided by the ThriftyFun community.
My Chevy S-10 pickup heater only works when I drive fast. It'll work for a few seconds and then stop blowing hot air.
By David L.
I have a 99 Dodge 1500 that the heat blower works fine until you turn the head lights on; then there is no blower. Tried all settings and it just doesn't blow. If you turn the headlights off the blower turns on.
By Jamie G.
Louise, we all understand you are proud of your son, and I am sure he is a great mechanic...but replying to every post with "find a trusted, reliable mechanic" isn't really what this forum is about. This is for those who are mechanically inclined and may be able to fix the problem themselves.
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
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 got an alternator put in my truck, a 2002 Redezvous. A day later my heat stop blowing. I changed the fuse; it came on and then went right off. What's wrong now?
By Jamil
Why does the fan in my '98 Chevy 1500 turn on and off by itself?
By TyC
Sounds like an electrical problem to me. If you don't have the manual for your car go online and get one. Look up the problem once you get the manual.
What would be the problem if there's no power to the plug for the resistor?
By Samuel from Russellville, AR
The guide that is attached to this post has a lot of good suggestions. Here is a direct link to that guide. Click on any post to see all the information posted.
www.thriftyfun.com/
If you find a solution, please report back and let us know what you found.
Best Wishes,
Jess
ThriftyFun
I have Ford E 250. The heater blower works, but there is no hot air.
By Mark
Is the thermostat working? A poorly functioning thermostat never lets enough heat accumulate.
Does the antifreeze test in the correct range? Old antifreeze can't pick up heat fast enough to deliver it to you. If you get warm air on low, and cold otherwise the antifreeze is prob the first thing to check.
My heater only blows hot air on the low setting, but cold air on high.
By Brandon
This usually means the antifreeze is old, and needs to be changed. It still has some ability to hold heat, so you get heat on low, but when you switch to high the extraction of heat is faster than the fluid can absorb. Replacing the antifreeze solution completely should solve this problem.
My new pick-up is blowing hot air out of the vents even when my heat is off. The only way to stop this, is to close all the vents and that's hard to do when driving and the other vents are on the other side of the truck. Once the heat is off I should not be getting heat coming out of the vents. This is over heating the inside of the cab and I have to open windows.
Does anyone know why this is happening? They have a recall that a part will cause a fire. I wonder if this could be happening to my truck? I am going to take it in once they send the letter for recall. Thank you!
By beachbumdaddy
It might be the switch is bad, I had that happen in my Tahoe. Your truck should be under warranty so I would just get it fixed, no reason to wait on a recall letter.
Sometimes it does, but not all of the time. It is just warm, not hot.
By Timothy
Are you low on antifreeze? Could also be a heater core.
I have a 1992 Chevy s10. The heater will not blow hot air and the only air that it does blow comes out of the floor vent behind the stick shift. It comes from there no matter which setting it is on. Any help would be much appreciated. The cold has set in.
By James R.
If you're air is just barely blowing, you may need a new blower motor. If your air is blowing, but isn't hot I would guess that you need a coolant flush. Hopefully you don't need a new heater core. But I digress. . .
If you can't change the direction of the air flow in your pick-up chances are that the cable or control arm connected to the actuator broke. Could be that it somehow disconnected, but not likely.
If you're feeling frisky you can go to your local library and review a Chilton's manual or something of the like. If I remember correctly, you'll want to locate a GM pick-up manual. You'll find step-by-step instructions on how to take everything apart.
Remember: It's not that working on your vehicle is difficult. It's just a matter of how much time it takes, and whether or not you have the tools to do the job. To my experience you'll most likely need some screwdrivers, a socket wrench with metric sockets, and some star bits. And a good light source is a must. You can get a "security set" of something like 100 bits at Harbor Freight for about ten bucks.
Take your time, pay attention, and make the effort to be organized.
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.
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
I replaced the blower motor, resistor, and switch, and checked the fuses in driver's side, all OK. I can feel the heat if I put my hand by the vent, but it is not being forced out like it should. What else do I need to look at?
By RMD
I have a 2003 Chevy Silverado 4x4. The blower does not come on. I checked all the fuses and none were blown, but when you cut the switch on you can here the engine pull down. What would cause the heat not to work?
By tf
The heating will not shut off in my truck even when you remove the fuse or key; it is still running.
By Pam
What procedure do I use to diagnose the heater on a 2000 Ford series truck? It is not getting hot; it is only blowing warm air.
By Mike
I have cold air on the passenger side floor. Why? The driver side is OK.
By Paul
Have a 1995 GMC K1500 that the dampers stopped working on the heater. Can not find vacuum lines going into cab and nothing in repair books for this problem. Anyone have any ideas that will help?
By T. Diff
I have excellent heat in my 1995 Dodge 1500 when in a warm building, or garage, or when it's warm outside. I replaced my radiator, water pump, thermostat, and flushed out the heater core. When it's cold outside, I have very little heat when going down the road. When I stop, the heat gets less warm.
By tom Campbell
I have a '98 Dodge 1500 truck. The heater will blow warm air as long as it is sitting still, but when you start driving down the road, then it starts blowing cool air. I changed the thermostat first thing, but it didn't change anything. I am needing a little help here.
By Rick
I own a '01 Dodge 2500 V8 and the heater gets hot as I press the gas pedal. Then it goes cold when I let off. I just put in a new thermostat and water pump trying to fix the problem.
By Bill A from South Bend, IN
I have a '02 S10 and it won't blow any air out any of the vents. Any suggestions?
By Noah H.
My truck heater doesn't blow hot air through the dash and floor vents. What's the problem? It works fine on top of the dash, in the defrost area.
By Myron W.
How do I get my heater hot on my 2008 Ford, after changing the thermostat?
By Gary C.
I own a "03 Chevy 1500 4x4. The switch to control the heater/ac does not work. It does not blow air. I changed the blower resistor, but that did not fix the problem.
By V Beers
I have a '92 Dodge 250 and the heater fan is not working. Is there a way to test the switch and the fan independently to see which one is the problem?
By James H.
I changed the thermostat. It was blowing a little warm air so I cleaned out the duct. Now it only blows cold air.
By Gerald S.
We have a 1994 GMC Canyon 4x4 truck. We are thinking the reason why our fan and heater, etc. suddenly stopped working may be due to a fuse. The owner's manual is not too helpful on where you would check for a fuse being burned out. Would anybody have information on this?
By drcjones1
How do I know if the heater switch is bad in a 1999 Chevy ck1500 truck?
By Jody H
My '99 Dodge pickup won't blow hot air. It blows fine, but doesn't get hot. It blows about room temperature.
By sares
I have a 2010 Chevy S 10. The heater makes a loud scraping noise and sometimes it doesn't heat properly.
By donnb from OH
I have a 2003 Sierra with climax control and I get heat at 32 c, but when I turn it down even to 31 c it starts to blow cold air.
By Guy J
My 1972 Chevy pick up has hot air coming in the cab all the time. How do I fix it?
By Danny
No heat is blowing out just cool air when switched onto heat in a '98 Chevrolet z-71 truck. Why after I had the heads redone since I have gotten my truck back from the mechanics I turn to heat on the control and no heat works just cool air. I took it back and they said it may be an actuator. Can someone please explain how to fix this? I learned it's in the dash or the dash would have to be recovered that was all they said.
By todd Wyndham
I have a 2000 Sierra pick-up and when I put on the blower for the A/C I get a loud squeaking noise. It stops when I shut it off. What could it be?
By Denis L.
Heat comes out of vents when all switches off or on no matter the setting.
By Joan T
I have a1998 Chevy Cheyenne K 1500. My blower seems to work fine. It won't blow out of any of the vents.
By Kevin
I own a 2005 GMC Sierra pick-up. I changed the fuse under the hood marked "blwr" which I assumed was the fuse leading to the blower motor. I put in a 40 amp fuse. But this was no help. Then, I put in another fuse (brand new), but still nothing. Can you help? Thanks!
By Bob
My 2005 Chevy z71 is not blowing heat on the windshield, but it is blowing heat everywhere else. What is the trouble?
By S Butler
I have a 2001 Chevy Silverado 1500. I just recently put it in the shop and had the entire ac system replaced. The heater will work if it's pulling air from outside, but as soon as you put it to recirculate the compressor kicks on and blows ice cold. The guy at the shop acted dumbfounded when I asked him about it. Help please.
By Derik L.
In my 93 Chevy k1500 the floor vents stay open, even if the air is off. It blows hot air onto my legs.
I have a 2000 Ford F250 4x4 7.3 diesel club cab truck. My heater has good heat, but is stuck in defrost even though I move the knob to floor heat. What do I need to look for?
By Jerry D.
My 2007 GMC Duramax truck heater will not switch off of defrosting the windshield.
By Chris H.
My heater control panel went out on my 95 Tahoe. How can I get heat?
By Ryan
My 1993 Silveraldo 1500 heater has got no power. I checked the fuse; it's OK. I had a dead battery and after recharging it I had no power to the heater. Is there a second fuse? I'm at a loss. It worked fine before the battery died.
By Ted
I have a 2005 Tahoe. I changed my heater core and now it's only blowing cold air in the front.
By Angela
The cab does not heat up. I changed the thermostat, but it still doesn't heat. It is a 2000 model. Please help.
By Rex
I have a 2000 Dodge truck. I have a full radiator and a new thermostat. I flushed the heater core and it is still blowing cold air.
By Terry from Stafford, VA
My 03 Dodge 1500 only blows hot air on the passenger side.
By Bruce
My 2001 GMC Sierra isn't coming up to temp and it's blowing out warm air. It took 15 minutes of drive time too get to 180 degrees.
By Tim
I am just wondering if anyone has any ideas, I'm running out. My 98' GMC Sierra 1500 has an issue with the heat control (off, low, med, high). The plug behind it melted, so I spliced in a new plug and temperature control. I replaced the resistor as well. Any ideas where to venture next?
By Darren
I have no heat in the cab of my 1987 Chevy v10 truck. It has a new heater core. The system is clean and the AC works in the summer. Why doesn't the heat work?
By ElmerJ
Is the black wire on the fan behind the glovebox a ground wire or power?
By Niles from Bethel, VT
I have a 2008 Ranger and the heater blower just stopped working at any speed. I get heat, but no blower speed.
By D Whitt
The heater blower on my 1999 Chevy K1500 comes on and off when it wants to. What is causing this?
By Rich
When my truck defroster is running my RPM cycles.
By RH from Mobile, AL
My Chevy C1500 pickup truck temperature gauge started too hot, then drops to cold, and then no heat. Then it starts working right. What can be the problem?
By genie
The blower works, but only on the floor setting. There is no defrost or air from the vents.
By Joe from ME
Air blows through, but no heat. The heater core is good. Someone said might be vent dew?
By E Fields from Silver Springs, NV
I have a 2003 Dodge 1500 Hemi. The heat on the seats works well and the heat on the window barely blows any heat. What would be wrong with this?
By gail
I have a 2009 GMC Wt truck. About a month ago, lukewarm air only would come out. I also noticed at the same time that the left and right blinkers worked, but no noise, just visual. The radiator is full. Today, no heat at all, just cold air. Temp reads 210 on average.
By Troy
I have a '99 e250 truck. The heater core hoses won't get hot neither will heater core. I replaced all hoses and radiator including thermostat. After a fix for overheating, neither the heat core lines nor the core will get hot. Stop Leak has been put in old radiator. I used a hose to flush the core and did get water to go through under high pressure, from hose.
By Erick from Baltimore, MD
I have a 1993 Chevy S-10 pickup and the a/c and heater does not blow air.
By Ronald
I have changed my heater core out and put in a n'ew thermostat. The blower is working, it is getting hot at the core, but no circulation. I have a '96 GMC Sierra.
By Brad
When it is really cold out, my Ranger does not throw very much warm air. When it is warmer out it throws plenty of heat. The heater door does not operate, but is in the right position. Both the in and out heater hoses get hot. Has anybody run into this problem before? The temperature gauge always runs where it is suppose to be. Every so often after 4 or 5 miles the temperature gauge will drop all the way down and then blow cold air and then slowly go back up. Thanks for the help.
By Mark L.
My heater knob was stuck and only blowing out hot air. Now it is stuck only blowing out cold air. The knob turns both directions.
By Larry
