2004 Grand Prix overheating. Help!

Asked by Jul 31, 2016 at 11:58 PM about the 2004 Pontiac Grand Prix GT1

Question type: Maintenance & Repair

Hello everyone, so I have a 2004 grand prix gt with
196k miles on it and for some reason it has been
overheating like crazy in the past week. The needle
just keeps going up, and then about 2 miles down
the road the computer says "AC off for engine
protection" I replaced the thermostat today and it
didn't help. I have a hunch that it's my upper
radiator hose, because I can drive it around the
block and the only warm thing will be that. It'll be
hot and slightly soft to the touch. If anyone has any
insight on what to do, would you be willing to
provide me with some help?

4 Answers


Check your water pump is working, remove radiator cap and see if any coolant is being drawn down. Or run the heater core on max and see if you are getting heat in the car. Running the engine and letting it continually overheat can really ruin it. So I'd get the cooling system completely checked out. Flush it & make sure you have no blockages, replace thermostat & radiator cap, check the water pump, hoses, coolant temp sensor, also check for presence of hydrocarbons with a test kit, that will let you know if you have a possible bad head gasket.


Water pump for sure those cars are the one thing that's goes bad alot


A rad hose has no effect on coolant temperature. Is your rad full, first of all? If so I'd get it flushed and pressure tested. I don't think its possible for a water pump to stop pumping, it may make noise, or leak, but it always pumps.


If the upper hose the only one getting warm, then there is clearly a blockage or coolant is not circulating. Hopefully it's something simple like thermostat not opening. And yes, a water pump can stop pumping. I've removed them and seen the fins on the impeller nearly gone, from corrosion and wear.

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