Question about Mitsubishi Galant

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I have a 1998 Mitsubishi Galant. I have a problem with the cooling system and air conditioner. I removed the thermostat and flushed the radiator already but the car still starts to overheat whenever I come to a stop and cool down as I drive down the road, the air conditioner also quits working at an idle. It has an electric [dual] fan system that is not belt drive and the air conditioner works while going down the road. The fan was also working when I let it idle and watched it with the hood up. Are these two problems connected and what should I check to find the problem? The fuses are brand new as well.

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  • Phoenix Cain May 09, 2010

    Thank you, and no, there is no blockage but the radiator was pretty dirty. I had this feeling that the fan is possibly quitting but I can't verify it. I do a lot of mechanic work but I'm no good at all with electric stuff. Thank you again. I will try that out.

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Hello! First just a few questions...Is there any debris blocking air flow through the grill area, between the air conditioning condenser and the radiator? if not the radiator itself is to blame...The cooling fins are clogged externally and/or the internal flow is restricted due to build-up...I recommend replacing the radiator...Install a new thermostat, and replace both upper and lower hoses as well...Good luck...


Guru.......Saailer

Posted on May 09, 2010

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1 Answer

Heating problems for Mitsubishi Galant 2000


1) The "heat" cycle on a vehicle depends on the engine's operating temperature when "heat'' desired," as well as the "external temperature of the atmosphere; colder days will create "lower" internal temperatures for the vehicle's passenger compartment as related to the amount of cooling of the radiator fluid through the radiator.
2) One option exists as to place "a 'piece of cardboard' in front of the radiator itself," especially in very cold areas of the country.
3) The other problem may involve your "thermostat" of the vehicle being "bad" (they fall apart sometimes), versus being of the wrong temperature variety; In this case your "automotive technician" should be consulted so as to replace your vehicle's thermostat with a different thermostat.
4) Lower temperature thermostats (185 F) open the system to the engine at 185 degrees; with 195 F opening the system at 195 degrees.
5) One of these solutions (the cheapest being the cardboard) may be of assistance (just remember to remove the cardboard in the summer/spring).

Jan 22, 2013 | 2000 Mitsubishi Galant

1 Answer

02 Galant slightly overheating after driven about 50 miles. Have replaced coolant, thermostat, temp sending unit and radiator cap


Drain the system again and try back flushing the radiator and the block - using a high flow rate of water try flush in the opposite direction of the normal water flow, ie. out of the radiator filler cap and out of the block top hose (remove the thermostat). Be careful to do this on the engine when it is cold. Also check that the radiator core is not obstructed by leaves, insects etc. If this does not work, check the ignition timing, brakes for binding, wheel alignment and even tyre pressures. All these things can contribute to an increase in engine operating temperatures

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My thermostat indication is on H. When I turn on the heater the indication drops to 50%. I have 75% of antifreeze in the reserve tank.


1. Does your radiator fan works when the temperature indicator on H?
2. Have your flush clean whole cooling system and put fresh new coolant to resolve problem?
3. Does reserve tank amount ever decrease?
4. Have had the thermostat function checked?
5. Technically when you turn on the heater it bypass the thermostat line and goes into heater and after giving up heat enjoins radiator return line.
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99 Mitsubishi Galant, engine is over heating. Where is thermostat located?


I have a 4 cyl engine in my galant and the thermostat is found by following the LOWER radiator hose. You will need to remove the battery in order to gain access to the thermostat housing mounting bolts. There is a video on Youtube.com showing the removal and replacement of the thermostat and radiator for a 1999 mitsubishi galant.

http://youtu.be/Er1szRKrk7c

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1 Answer

What cause engine overheating


Several problems can cause it. A thermostat that is stuck closed (will not allow coolant to circulate- remove and place in a pan of boiling water, it should open rather quickly). Engine cooling fan(s) not operating as temp rises (when temp gauge goes up past normal range, check to see if fan is running. If not, it could be a switch that controls the fan operation, or less possible, a bad fan motor). A radiator plugged up with rust and sediment won't allow proper circulation of coolant, resulting in overheating. If coolant has not been changed in a long time, or appears rusty, flush the system thoroughly. You may need to have the radiator professionally flushed if it's plugged up bad. Good luck!

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1 Answer

Change the thermostat in the galant.


1. Raise the front of your Mitsubishi Galant with a jack and lower onto jack stands, or use wheel ramps. Disconnect the negative cable from the battery. Drain the coolant into a suitable container by opening the drain plug on the bottom of the radiator.
2. Step 2 Follow the upper radiator hose to where it meets the engine at the thermostat housing. Loosen the clamp at the engine end of the radiator hose and pull the hose off the thermostat housing.
3. Step 3 Remove the two bolts on the thermostat housing cover and pull off the cover. Note the position of the old thermostat and remove it from the thermostat housing. Place a rag in the thermostat housing and scrape any gasket residue from the inside of the thermostat housing cover.
4. Step 4 Take out the rag and insert the new thermostat in the same position as the old one, with the spring-side facing into the engine. Install the new gasket or o-ring, depending on the type of thermostat you are installing. Note that most late 1980s and early 1990s Galant models use a thermostat gasket.
5. Step 5 Replace the thermostat housing cover and tighten the bolts. Re-attach the radiator hose and tighten the clamp. Fill the radiator with new coolant, or use the coolant drained from your Galant earlier if it's relatively new and clean.
6. Step 6 Start your Mitsubishi Galant and run with the heater on high until it reaches operating temperature. Make sure the heater is blowing warm air to ensure the thermostat is working properly. Check for leaks and tighten the radiator hose clamps if you detect any.

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1 Answer

Heater wont get hot


Make sure the temp door is moving when you change the temp.then change the thermostat out with a new one.Bleed the system of all the air in the cooling system.If still,no heat,remove the heater hoses from the heater core,and flush the heater core out with a water hose.In one pipe,it will flush out the other pipe of the heater core.

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3 Answers

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I would go with slowcalafl. It is either air, or a cracked head bad head gasket. Remove the radiator cap when cool. Start up the car and watch for bubble emerging from the coolant. If it continues to bubble, you have a bad head or head gasket. If not, look for improper timing as another possibility.

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1 Answer

Overheating and plymouth voyager van 1997. 183,000


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