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Old 06-12-2010
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Overheats

My truck has started to overheat. Right after I start it it heats all the way up to the danger level. If I drive it overheated for about 3min it cools right back down to normal temperature and will stay at the normal temperature as long as I am driving at a steady pace. However if I stop, like at a stoplight, the temperature will quickly rise again. I'm at a loss as to what this could be?
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Old 06-12-2010
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It is a 1999 Ford Ranger.
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Old 06-12-2010
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Have you checked the amount of coolant you have?
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Old 06-12-2010
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Yea check the coolant or the fan that it works properly.
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Old 06-12-2010
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Could be thermostat stuck too
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Old 06-12-2010
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Fan clutch is my guess
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Old 06-13-2010
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i have a lot of trouble with mine doing this (once a year at least) and i normally drain the radiator and flush it out with a hose and refill and that usaully fixes it for a while. I've also had to replace the thermostat once tho.
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Old 06-14-2010
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it sounds like you either have a blown head gasket or your thermostat is sticking
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Old 06-14-2010
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your radiator core is plugged with deposits

it is passing just enough coolant to cool it at speed
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Old 06-14-2010
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My guess is the thermostat. Mine didn't heat at all. So I put some cardboard in front of the radiator and I got some heat. I did this to check if the gauge was working. Removed the thermostat and it was stuck open. I just sanded all the rust from it and it has worked just fine. And that was a year ago. Ever since, I've had minus 0C and over 40C.
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