Temp gauge pegs hot after about 10 minutes driving. Does not boil over. If I open radiator cap while running does not appear fluid is moving. My wife has driven it to & from work like this several times 20 miles each way. Can't really tell if it is overheating or not. Hot air blows from heater just fine. Any help would be great
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If the thermostat is not opening, the engine will keep getting hotter as you drive. You could be low on coolant and have air pockets in the system which would cause the temp gauge to not be accurate. Is the radiator fan coming on when the tank is boiling ?
you could have a faulty temp gauge(air in the system) was my problem let it cooldown all the way....open radiator cap turn your heater on so water circulates all around the engine add coolant if needed it helps to gun the engine a little watch for flow of coolant then cap it.a closed thermosthat would also cause you car to overheat.
disconnect the heat hoses going into fire wall , put hose into one with pressure and flush as it sounds like it could be bloked in the heater core,the other thing that could be the problem be the hot ,cold switch as it restricts the flow to makes the heater hoter or colder , it might need tlc or replacing as it is manaul not elec
I have a 2002 Mitsubishi Montero Limited.
The other day the temperature gauge went from normal temp to Max HOT.
The radiator is still cool enough to touch, it is not boiling over, and
there is still coolant in the resivour. The gauge would go back down to
normal in a few minutes, but now it immediately climbs to Max Hot
within 1-2 minutes of turning the car on.