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Heater doesnt blow any hot air - Cars & Trucks

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  • Contributor
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Open the hood and locate the 2 hoses from the engine that carry coolant to and from the heater box in your fire wall. Locate the valve in one of the hoses and have some one inside the vehicle with engine running turn the heater fan on and then go from warm to cold to warm and see if the valve moves from open to closed. The valve is probably stuck. You failed to mention year make and model these are important details in T/S

Posted on Dec 31, 2012

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Lots of things could be "the problem". First, is the fan turning? Is the heater core on the passenger side under the dashboard getting hot? Are the heater hoses connecting to it BOTH getting hot? Is the on/off valve switch opening and closing as you slide it on the dashboard? If any one of these things are not happening you need to find out why!

Posted on Dec 31, 2012

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Posted on Jan 02, 2017

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SOURCE: Heater doesn't blow hot air

First check the coolant level in the radiator. Check your heater core hoses on the firewall underneath the hood. Let the car come up to temp. and feel the two hoses. If only one of them is getting hot you may have bad heater core or a bad heater control valve.

Posted on Jan 05, 2009

  • 25 Answers

SOURCE: heater in 2001 jaguar s type not blowing hot air

check for hot water, check for power to blower, do a little work yourself before asking questions, if you can't do this then you really need help

Posted on Jan 15, 2009

  • 217 Answers

SOURCE: '98 S-10 heater blowing cold air - not hot air

will the air flow switch from floor to the mid to defrost? if so then we have a problem with the tempature door actuator. easy to replace just in tight place. Keep me posted for more help or if this was any help thanks

Posted on Jan 31, 2009

dttech
  • 4803 Answers

SOURCE: Why doesn't the heater blow hot air?

If your "Check Engine" or "Service Engine Soon" light is on, you need to have that checked out first.
If not, the next thing you should check is your engine coolant level. (Antifreeze) If the coolant level is low, the engine coolant does not circulate through the heater core and the the heater doesn't work. The coolant level could be low for a number of reasons including a leaky hose, water pump, or head gasket. In any case, if it is found to be low, you need to find out why.
If the coolant level is OK then the thermostat function needs to be checked to make sure that the engine is reaching operating temperature.
If all of the above checks out OK, then the heater control valve and/or the blend air door in the HVAC housing needs to be checked for proper operation. (NOTE: some cars are not equipped with a heater control valve)

Posted on Oct 10, 2009

SOURCE: Mitsubishi Eclipse Ac and heater problem

cold air on passenger side of car and warm on drivers, why

Posted on Oct 14, 2009

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I have a 2000 dodge avenger that I recently bought. My heater works but doesnt blow hot air, any sugestions on getting it to blow heat.


Check the heater lines going in the firewall. One hot, one maybe warm? replace the heater core. Both hot, replace the blend door actuator.

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sounds to me the hissing is the sound of a leaking heater core. Its smells weird becuse coolent usually has a sweet smell that is very noticeable. I bet the floor is wet/carpet damp in the front near the hissing. I bet your coolent level is low as well. Replace heater core.

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check on your heater core hoses both of them should be hot if one is hot and other is cold take off the hoses and back flush it if that doesnt help your heater core needs replaced

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1 Answer

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To troubleshoot this types of problem,click the link below :---
Car heater blowing warm, but not hot air?http://schematicsdiagram.blogspot.com/2011/12/car-heater-blowing-warm-but-not-hot-air.html

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This will help.Thanks.

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1 Answer

1997 jeep wrangler will not blow hot air from heater,,, i replaced the thermostat ,, heater core isnt leaking, and my heater knobs are working,, it blows somewhat warm air , but doesnt get completely hot,


sounds like either the antifreeze solution is to strong [ shouldn't be more then a 70% mixture ] or the heater core is plugged [ some "stop leak" products will cause this.

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1 Answer

Heater/defrost doesnt blow hot heater hoses one


The heater core is probably clogged. The best method i have found is to remove the heater hoses, and blast compressed air into one side or the other in short bursts. This will tend to launch a clump of sludge out of the other side, and is very messy. Once the heater core is unclogged and reconnected, it is a good idea to chemically flush the entire cooling system, then flush with clean water and refill with universal coolant.

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1 Answer

MY HEATER DOESNT BLOW OUT HOT AIR


check your coolant levels first then if you have never replaced the thermostat replace it. there are several other things to check, proper operation of the damper for heat, does it fully close? Heater control valve, does it open fully. and several others but these are listed in order to how i would check this problem out. Merry Christmas, and hope this helps you.

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1 Answer

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Check coolant level. You may have lost coolant. If so, usually, leak is due to worn water pump seal.
Also, make sure that you have vacuum to move flap, so the air will go through heater core.

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1 Answer

2000 Chevy Silverado 4X4 - Heater isn't blowing hot air


No your thermostat is stuck open which will not hurt the engine. but needs to be replaced, the thermostat is what allows the engine get up to operating temp. before allowing water to flow through the radiator and when it is stuck open it doesnt allow the engine to reach operating temp. so the heater never gets hot. I hope that helps you out.

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