We changed the thermostat and it is still overheating. Checked the coolant and it is fine. Also, now we are not getting any warm air when we turn on our heater, but we didnt have a problem with this before.
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i would 1st check the thermostat, most overheating problems result from the thermostat sticking closed, and not allowing the coolant to circulate, while you are doing this, check the upper and lower radiator and heater hoses, to make sure that they are not collasping, also check the coolant temperature switch. this switch is normally located on the top of the intake manifold, most of the time, not too far from where the top radiator hose is connected. hope that this information has helped you.
Sean I have a 2004 Montana and mine is also overheating. I just paid Pep Boys $300 to replace thermostat and it is still overheating. They checked for coolant leaks, water pump is okay, the pressure checked out ok. No air in the system, etc. Today I brought it to a different mechanic and he says my cooling fan is kicking in very slow after the temp gauge goes 3/4 up which is not supposed to happen. My fan does not have a relay and he said it is either the temperature sending unit, but most likely it is the COMPUTER which is going to a very, very expensive repair. He said this happens a lot with Montanas! I am pissed. I just bought it used and the previous owner probably dumped it b/c he knew it needed a computer. Also the Fuel gage does not work and it will cost $800 to replace the fuel tank which contains the fuel sensor.
Hi, check you have heat coming out the heater in the car put it on hottest setting and see what happens if it comes out cold then the chances are the head gasket has gone and is pushing gasses into the coolant system causing an air lock and then over heating.
check the oil for signs of a white substance look on the oil level stick and also inside the oil filler cap if their is any signs of milky substance then this is proof head gasket has gone.
Your thermostat may be stuck open. Your cooling system could be low on coolant, but if that was the case your temp gauage should still move.
Would probably start with a thermostat-you may even have trouble code stored for the thermostat(P0128).
tran should be ok need to take head to repair shap and be sure head is ok and not cracked. thermostat, radiator, or cap, hoses need to be checked to dtermine what caused it to run hot also check engine fan. Pls rate this solution
It is probably the problem. To make shure that need to change the gaskets, one of the symptoms use to be thet the temp rises when you are running at speed 50+ average, where is supposed that the car gets a lot of air due by the speed and nobody thinks that will be overheated.