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check the radiator censor making sure that the wires for this have not come off is there any fluid on the road when its been left for a few hours normally a car loses water any way may be half a pint a month or so this is normall check hoses for splits before forking out for a new water pump
ok iif the instrument cluster does not work.. before i give a solution can you tell me if it have atach and temp gage not a temp gage witha idiot light but a actual temp gage.. because if temp gage and fule gage hands are not in their proper place like if yo uhave a 1/4 tank of gas and it reads way past full and the temp gage is gone out of site way past say 240 degrees then it is your speedo head .. have this trouble the other day on a chevy 2002 cavalier.. replaced the head and wahla the car started. it seems the speedo head is tied in with the computer system on these cars.. and if the tach is not working you need not worry if you cannot find a head with a built in tach.. a normal speedo head with out the tach part will also work.. just when you change the head count the pins on the old one and compare it to the new one if they match then just plug it in and car should start..
if the temp gage doesn`t go up you could have a gage problem or even a coolant sensor problem that works the gage only and not the one that sends a signal to the pcm to turn on the cooling fans and monitor the engine temperature,if it is the thermostat then it will be stuck open and the only way to correct the problem is to replace the thermostat other wise it can stick open again or closed causing the engine to overheat.
It sounds to me like the gauge is working correctly. You probably have an engine that is running cold. I think I would try replacing the thermostat. Also make sure your coolant level is correct. The gauge will not work correctly if it is low.
Not computer. You have air in the cooling system. Bubble is moving around. Park on an upward incline, take the radiator cap off, run the engine and keep the radiator full. Let it warm up and let the thermostat open (until you see flow in the radiator). Then fill to the brim and keep full until it stops going down. Also open any bleed ports you can find in the cooling system (there may not be any) and let any air out of them. Let the engine run and check for any bubbles that continue to come out. If bubbles continue to come up, you have a blown head gasket that is forming the bubble and causing the heater and temp gage issues. If bubbles do not come out, maybe you have fixed the problem by getting all the air out. Please let me know if you have any questions.
Likely the temp sending unit has failed. They aren't very expensive. One on 4.0 engine is on the thermostat housing but don't know which engine you have. Blower problem could be the resistor pack but not sure exactly where it is on yours, it is always on the heater box and generally looks like a flat fiber plate with four wires going to it.
Check engine light can be any number of reasons, dirty air filter, need oil change, or more serious engine trouble. The temp gage issue is normal, this is the computer resetting itself. My car the fuel gage and temp gage do this...don't be alarmed. Take it to Advance Auto Parts and they can run a free engine diagnostics test on it to see which error code is tripping your check engine light.