Question about 2003 Mitsubishi Galant

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No heat I changed the thermostatand I filled the radiator. I have all the fuses working. The blower works. air conditioner works

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Sounds like a heater control valve is not working.Either cable driven or electronic. In either case, when activated,this valve opens, allowing hot water from the engine's cooling system to flow through the heater core ( passenger side foot well) where air is blown across it, heating the cabin. Ck for blown fuse. Try to determine if it is cable operated or electronic. One way is to go to "Autozone" A retail parts chain,on line, and navigate to repair. Autozone has enlisted the services of "Alldata" DIY to help its customers repair their' own vehicles. Also,By looking up the part for your specific make model, one can establish what type of component is being used, and where it is located on the car. Also, make sure you didnt install your thermostat upside down. When this happens, your engine can overheat, restricting water from flowing through entire system, which effectively render's your heater as inoperative.

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Posted on Sep 30, 2009

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Heater core probably not getting hot water, could be mechanical- hot water line valve not opening, or electrical- same thing- but valve relay not working.
could be defective thermostat, or wrong thermostat, or bad temperature sensor. do you have a temperature gauge on your dash, or an 'idiot light'. meaning, if a red light comes on when it overheats, then it's time to check for leaks and check coolant level in radiator? if you have a gauge, is the needle, or bar moving as the engine heats up? if not could be a defective sensor. if you set it to heat, does the fan work? sorry, you already stated that the fan works.
there is duct-work under the dash and a flap that that opens either mechanically (in older cars), pneumatically (from the vacuum line- usually older cars), or electronically (motors, actuators) in newer cars. could be a problem there. have a trusted mechanic check it out.
to check the thermostat, start the car when it's cold, remove radiator cap, wait 'til it warms up and check the liquid in the radiator. if when it starts warming up you see obvious circulation in the radiator, then the thermostat is probably working properly. if not, you have a defective thermostat. return it and get a replacement! also, consider that you may have a bad water-pump! usually, you'll hear a nasty grinding or rattling noise from the front of the engine, and the car will definitely overheat! expect to spend some money on that and have your timing belt changed at the same time! if you're 60-70K miles, it's due for new timing belt, anyway. check your owners manual for service recommendations.
good luck!

Posted on Sep 30, 2009

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When you first start the car when its cold...put you hand around the top radiator hose to feel if water is running though it..you should be able to squeeze it flat also..this is normal...until the thermostat kicks in and opens then you will feel as rush of water going through it and start to get warm..normal thermostat operation. if this all works good then im afraid you must have a bad heater core..and this is sometimes hard to access and replace..

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I also had this problem with my 2003 Mitsubishi Galant and it was the heater core. Works great now that its replaced.

Posted on Oct 14, 2009

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Maybe your heater core is done or it could just be the heater switch for switching it from cold to warm air

Posted on Sep 30, 2009

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Are you talking about the blower motor or the radiator fan? The blower motor is under the glove box in the circular black plastic cover. This is very easy to replace, a new one cost about $50 and just plugs right in. There is a 30 amp heater fuse in front over the driver seat under the dash. It's above all the other fuses, its black and rectangular. If that's not it it may be the blower motor

But if its your radiator fan its another ball game. First try the fuses and the relay in the fuse box under the hood, driverside. If thats not it, it could be the fan motor. f the fan motor is burnt out thats easy. Thats $130 for a new motor at the auto store and there are only 3 bolts that hold the radiator fan assembly in. Pull that out, change the motor out (3 more bolts) and put it back in, plug it in and your done.

If the problem is in the radiator fan and not the blower motor it could also be a busted thermostat. Not horrible, but if you have the 1.9 liter engine you have to take of the distributor, to get to it. New thermostat is $8.

I had to replace the blower motor and the ac worked better than great after. My recent problem is in the radiator fan. Not coming on at all. I replaced the motor, the relay, the fuses, the thermostat (was also broken), and the problem persists. This is a worst case senario. I think I have it narrowed down to a fusible link, but have to locate them.

Good luck

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