SOURCE: Coolant filling up overflow bottle
You may need to ask AAA to put a radiator pressure tester on the resevoir bottle and pump it up to operating pressure(Pressure cap rating) and see if it over pressurises while it is running at operating temp,rev engine up and down and watch what the testers pressure readings do,it should move up and down in sync with the water pump.If the pressure keeps building i would have to believe that combustion chamber gases are over pressurising your cooling system.Also test the pressure cap is functioning within factory specs.
SOURCE: 2001 mitsubishi eclipe heater does
It could be very well your water pump from the sounds of it. When was the last time you had that check or replaced? That would be my next guess to the problem...what's your mileage on the car?
SOURCE: The temperature gauge pegs then comes down some.
it seems like you have air trapped in the cooling system run it with the coolant cap loose so air can escape air will cause exactly what you described if you cant get air out remove sensor and clean it reinstall it your problem should go away.because air is near the sensor once you remove it a little coolant will leak causing air to escape.
SOURCE: 2003 Mitsubishi Galant Have a screaming
To adjust your alternator belt . First , take off the negative battery cable so you do not blow an expensive fuse on the positive battery cable clamp. Facing the back of the car , reach UNDER the alternator and loosen the bolt on the bottom right side, now loosen the bolt on the adjuster block on top, you can now turn the adjuster bolt and move the alternator to change or adjust the belt.
To take off or adjust the steering pump belt on the front of the motor, you need to loosen the nut on the back side of the adjuster pulley (right side ,belt is on the left) . With the adjuster pulley loose , you can use the adjuster bolt to move the pulley forward and backward to adjust the steering pump belt tension
Your hot /cool issue is tied to an electric motor under the dash that turns the flow of anti freeze on and off to the heater core. It's located under the dash to the left of the glove box. If you unhook the top of the glove box (push it to one side and gently pull it down) you should see it to the left of the blower motor housing. Some disassembly required. The part will cost about $120 to $180. part number is #MR958603. I saved money by purchasing it on line. It is a stocking part at most Mitsubishi dealers. Once you pull the glove box out and remove the bottom half of the dash all the way across, you should be able to gain access to the motor to replace it. Yes, you can do this yourself and it does help to have small hands. Caution: if you do not put everything back in correctly and tie/tape it all back down carefully in the correct places you will have lots of under the dash noises when you are done. At this time you may find the loose part that is banging/clacking under the dash. If you open the dash and see the valve opening and closing properly when you turn the temperature dial then you may want to just look to see if a simple cable or hose is unhooked.
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