Question about 2003 Mitsubishi Galant

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Heater works sometimes and sometimes doesn;t get hot when it is not working you will hear a noise then it sratrs working

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Blocked hoses or ur thermostae

Posted on Sep 23, 2009

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Posted on Jan 02, 2017

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My 2005 Ford Expedition is blowing hot air from the front vents and suddenly the rear vents stopped working at all but I can sometimes hear a noise on the rear part of the truck ,may someone please tell me...


to me this sounds like a blend door problem. this is in the heater box, first you need to pinpoint the noise. there is 2 heater boxes on front and a rear both have blend doors. being you hear a noise, I suspect either door is jambed by forign object or broken, but still could be a problem with the actuator for the door. as for the rear not blowing?,check the position of the front blower switch, one position will disable rear function. honestly this
should be done by an experianced technican, I was 20yrs ford.

Apr 02, 2012 | 2005 Ford Expedition

1 Answer

Heater doesn't work


Make sure the coolant level is full in the reservoir.

If the coolant level is good feel the hoses that go to the heater core back by the firewall. If one is cold and one is hot that the heater core is plugged. I have had fairly good success back flushing the heater cores and getting them to work. If back flushing does not work than the heater core will need to be replaced. The entire dash will need to be removed to do this.

If both the hoses are hot than it may be the blend door actuator. You should hear a distinct difference in the air flow from the vents by moving the heat control from full hot to full cold.

The last thing is the t-stat could be stuck open. If this where the case than the temp gauge will also be reading low.

Check those out and let me know what you find.

Feb 14, 2012 | 1999 Mercury Sable

1 Answer

My heat will works sometimes; sometimes it will not. Is it the thermostate not opening? I just spent $2300 getting in serviced with timing belt, etc in July ... I should have mentioned the heat problem but...


The heater should work even when the thermostat is closed. You cannot hear the thermostat. It opens very slowly. If you hear bubbling noises, you probably have air in the system that needs to be bled out. You may also have a leak. Something you can try is to get some coolant, park on a hill, let the engine cool. Do not remove the radiator cap while the engine is hot. When it cools, add coolant with the engine running. This will help burp air out of the engine.

Aug 14, 2017 | 2003 Mitsubishi Galant

1 Answer

The hot and cold selector switch on the heater doesent function


That part of the needs to come apart to see what is wrong.

Apr 10, 2010 | 2004 Ford Explorer

2 Answers

2004 Corolla - A/C and heater problem!


the blower motor could be on its way out other possibility's is a loose connector.

Aug 12, 2009 | 2004 Toyota Corolla

2 Answers

Ford ka blows hot air even set at cold


sounds like heater control valve situated under scullle panel common fault on ka set heater fan switch half way between hot and cold with heater blowing then touch valve if pulsing or clicking noise it is faulty if doesnt solve problem faulty switch

Jun 07, 2009 | 1999 Ford Taurus

1 Answer

Sometimes heater will blow cold air and a/c will blow hot air --a while back it started having a clicking noise but now it has stopped and started not working properly. i keep working with it and put it on...


Clump sound is probably the blend air door inside housing moving to where it's supposed to be. Is that when you notice it heating like it should? Try to pay attention when driving to see if you hear that "clump" noise or feel different temperatures as you accelerate, and then let of the gas, which would indicate vacuum operation of blend air door, and tells you that there is a vacuum leak somewhere in the system, or a perhaps just a faulty check valve in the line somewhere. let us know.

Dec 13, 2008 | 1998 Lincoln Town Car

2 Answers

02 galant heater not working


As me and my stepdad just discovered, the Galant came with an added feature to help the AC use less energy, by placing a heater valve within the dashboard. After pulling about 10-12 screws and half the dashboard apart, we simply opened the valve permanently. Many cars out there work that way all the time. Now after changing those lousy clamps into actual hose clamps by the firewall, my wife enjoys cool air in the summer and heat the whole winter. Hope this helps, there is a site that will actually show you a video of putting dash back together, as author did not film the disassembly.

Sep 10, 2008 | 2002 Mitsubishi Galant

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