Thursday, September 22, 2011

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My Hyundai Elantra GLS 2002 is running fine but does not give hot air when I put the fan on, with HOT/ COOL switch on the HOT side. If I put the fan off, I get some air (not as much as with fan on) but hot to some extent better than fan on. My engine temperature indicator shows normal, engine coolant level is OK, and apparently there is no leak. Can someone help how to diagnose the problem? Also, where is the thermostat for this? Further, how to change the thermostat if that is the problem? Do I need any special tool to do that?Get answers from millions of real people.?
It's not the thermostat. If it were stuck closed your engine would overheat.



Very likely it is a heater control valve, usually located on the fire wall in the engine compartment. It will have several smaller hoses going to it and a lever typically actuated by a cable. It allows hot water from the cooling system to run through the heater core when you slide the controls to %26quot;hot%26quot;. If it isn't working, you'll have no heat.



If you can get someone to move the control while you look under the hood, you should be able to see if it's moving correctly. Often, a cable will come lose. If it's not moving, it is sometimes possible to move it manually to the open position and leave it there for a while before you get it fixed. Then you have heat you can't turn off. In the winter, not usually a problem.



Good luck!

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