Question about 2003 Mitsubishi Galant

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No heater,change thermostat but still not working

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Could be possibly and air lock in the coolant system. Try run the vehicle with the rad cap off for approx. 10 mins and see if this helps. If not it could be your water pump?

Posted on Sep 29, 2009

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Posted on Jan 02, 2017

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I changed thermostat on 2005 buick rendevous ultra 3.6l. still have no heat. whats next?


Was lack of heat in the cabin the only reason you changed the thermostat? Were the radiator hoses hot (or very warm) to the touch before you changed the thermostat? Were the heater hoses hot before you changed the thermostat? Did you get a check engine light and code stating that the engine was not getting (or slow getting) to operating temperature?
Getting heat from your heater depends on a blend door actuator letting air flow through the heater core in the HVAC unit. If your radiator hoses are hot, your heater hoses are hot, and you have no trouble code indicating the engine is not getting to operating temperature, but you are not getting heat inside the car, you need to check your blend door actuator or the control unit for the heater.

Jan 08, 2017 | 2005 Buick Rendezvous AWD

1 Answer

Heater stopped working right after changing thermostat.


Did you fit the thermostat the correct way..? Most thermostats have a small hole in them which should go at the top. This allows air to bleed from the cooling system... There may even be an arrow stamped on the thermostat which indicates top:

car thermostat position Google Search

If you fitted the thermostat correctly you probably have an airlock in the cooling system .. in the heater matrix, caused by a drop in coolant level when you changed the thermostat

Set your heater control to HOT (this will open the heater valve and allow coolant to enter and circulate in the heater matrix).

Remove the radiator cap. If you can't remove the radiator cap, remove the cap on the coolant expansion bottle.

Start the engine and let it tick over until the thermostat opens and the engine reaches its full operating temperature. Any air in the system should escape. Top up if necessary.

Apr 19, 2016 | Cars & Trucks

1 Answer

Has very little heat has new thermostat!


Was the heater working ok before you fitted the new thermostat?
If no, you probably have a blocked heater matrix. That means you have to either try flushing the coolant system to remove the blockage .. or.. replace the heater matrix, which isn't an easy task.

If the heater was working ok before you changed the thermostat then it's likely you still have air in the system.

Set the heater controls to hot, remove the radiator cap/coolant bottle cap and start the engine. Let it tickover and warm up. Hopefully any trapped air will be purged from the cooling system.

Are you sure that the thermostat is okay? Thermostats have a small valve in that allows air to pass through. If your thermostat is mounted like a clock ..i.e .. the face looking out - the air valve must be at the top.



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Feb 06, 2016 | 1996 Nissan Quest

1 Answer

How to change thermostat in a 2003 ford windstar


Is the problem the thermostat, or is the heater control blend door not diverting the blower air across the heater core....or is the heater core clogged? The thermostat is actually the least likely cause of cool air in the passenger compartment.

Oct 17, 2014 | 2003 Ford Windstar

3 Answers

No heat changed thermostat


Are you saying the engine does not get hot or that your heaters are not working..?
If it's the heaters, change the temp control on the dash to full heat, then trace the heater hoses under the hood from the firewall back to the motor. Hopefully this will locate the heater tap. Now if the tap is vacuum operated, start the motor and check if there is vacuum at the small hose connected to the tap. No vacuum is correct. Now change the heater control to cold and there should now be vacuum at that small hose. if vacuum is still not present, or if you have vacuum but it does not go away no matter where the heater control is placed, suspect the control in the dash.. If the vacuum operation is correct, suspect a blocked or damaged heater valve and replace it..

Nov 05, 2009 | 2002 Mercury Mountaineer

1 Answer

My heater works on and of and my temp gage keeps going up and down just changed my thermostat what could it be


Did you bleed air out good after thermostat change, as well as have heater on while refilling the system? If not, leave cap off, run from cold and refill as necessary, with heater on, and if you have a bleed screw, re-bleed system, after heater running and engine warms up.

Nov 03, 2009 | 2007 Fiat 124

4 Answers

Engine rapidly overheats,coolantvery near boils


Most likely the thermostat. The heater bypasses the thermostat. If the thermostat is blocked the only cooling is via the heater matrix. To check start the engine with the heater off and put your hand on the thermostat housing when the thermostat opens you should feel the housing get hot. If it doesn't the thermostat is faulty.

Aug 29, 2009 | 1998 Ford Escort

1 Answer

Heater does not blow hot air


you might need to change the thermostat.. when the thermostat isn't working correctly it prevents the hot engine coolant to circulate and give you heat.

Mar 01, 2009 | 1994 GMC Yukon

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