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I replaced the thermostat but heater still only works when driving

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Did you check the strength of your antifreeze. Your heater core may be plugged. How's your airflow? is it strong. Otherwise, head gasket. Are you loosing antifreeze? Does your oil have water spots on the dipstick when you check it? A cooland system pressure test is the best way to find out.

Posted on Jan 16, 2013

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Heater temp on high only bows luke warm air after driving. A/C works just fine.Plenty of cold air from it

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Why is My Car AC Blowing Hot Air? - BlueDevil Products

Jan 27, 2016 | 2000 Chrysler 300M

2 Answers

2005 pontiac G6 heat not working, I've replaced the heater core. Replaced heater core, coolant is good. Now the it only blows cold air, the engine is heating to a steady 200°. Thermostat?

did you replace the actuator that drives the door for the heater core or cable? make sure both water lines going to the heater core are getting hot, if only one is the mix door is not working properly

Nov 30, 2015 | Pontiac Cars & Trucks

3 Answers

Heater works great when driving goes cold at a stop light!! Coolant levels are fine and temp gauge is fine also.

so the fan is not working ? blower
or if that is ok, then the damper is stuck in fresh air
so that only moving makes? air flow.
seems the heater core is hot. all you need now is dampers right
scan it yet?

Mar 28, 2015 | 2001 Dodge Dakota

1 Answer

The heater on my 2000 Camry only blows warm air unless the engine is revving. Could this be a faulty thermostat (I just had the heater core replaced)?

low heat at idle is farly normal for camry, i had alot of complaints about th that at a toyota dealership where i worked

Jan 23, 2013 | 2000 Toyota Camry

1 Answer

What is a ballpark figure for replacing a 2002 Ford Taurus thermostat?

stat is like 8 bucks,labor should not be more than 40 (at my shop)
worried the heater core may be the problem tho.
That is a very costly job.Try this,put a "winter front " on the
car,piece of cardboard in front of the rad.
I am assuming this car has no temp. gauge,so the winter front
will make the water temp go way up,if the heater works after like 5
miles of driving ,cool, the stat is bad,if the heater still doesn't work
the heater core is bad. The whole dashboard has to come out for the
heater core ,yuk
Don't drive more than like 20 miles with the radiator covered,just
to be safe,

Nov 25, 2012 | 2002 Ford Taurus

1 Answer


Feel the hoses going to heater core, one should be hot and the other warm. If one is cold or both are then heater core is clogged. Make sure heater control valve works and as vacuum to it and or the cable is free.

Jan 16, 2011 | 1976 Cadillac Deville

1 Answer

The Heater in the car works but does not get warm.

1. Check the engine thermostat (see the temp gauge). Replace thermostat if necessary.
2. Flush the cooling installation in reverse flow direction, and change the coolant.
3. Bleed correctly the cooling system.
4. Clean inside the heater core by flushing in reverse flow direction. Check for leaks. Remove and change it if necessary.
5. Check the water pump & drive belt. Replace if necessary.

Nov 30, 2010 | 1994 Jeep Grand Cherokee

1 Answer

My 2004 Chrysler T&C's heater works great when I first turn it on in the morning, while driving to work it turns to only cold air. What could be causing this issue?

That's weird - it seems like the thermostat is open when you start the mini-van (its supposed to be closed at engine start-up), and then the thermostat closes as the warms up (its supposed to open).
If you can replace thermostat, that may be the thing to do, since these thermostats often cost less than $10. Once the T&C has a new thermostat, see if the heater behavior improves, if so, discard the old thermostat.

Also, if your thermostat is actually behaving the OPPOSITE of a normal thermostat, then you're at
risk of burning up (overheating) your engine - on any trip longer than the commute to work. An engine at operating temperature needs to circulate coolant to/from the radiator (and/or heater core) to avoid overheating. So thermostat replacement may save your entire engine. In the meantime, your T&C will avoid self-destruction only if driven REALLY short distances.

Oct 12, 2010 | 2004 Chrysler Town & Country

3 Answers

2000 Jetta Heater Not working

2000 jetta warms up when idling, but gets cold as soon as I start driving.

Dec 17, 2008 | 2000 Volkswagen Jetta TDI

2 Answers

98 Civic with non-functioning cooling fan

bad thermostat or worse a plugged heater core or bad summer/winter diverter valve. look for bad thermostat.

Dec 08, 2008 | 1998 Honda Civic

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