My wifes 2003 G35 sedan started to overheat today. It has not done it in the past, and this last week, it has started getting into the high 90's. Today it aproached 100 and started to overheat. This was during driving as well, not just at a stop. Are there any common issues I should fix first? I was going to try the usual process of thermostat, then the water pump if that doesnt solve it. It is full on coolant and has not leaked any. What would be reccomended on the car? Thanks

 

I would bet it's the thermostat...

 

T-stat, check the fans or mechanical fan, make sure the radiator cap is pressurizing the system ( upper hose should be firm when system is at normal operating temperature)

 

Thanks, I was curious if this was a common issue with them. With the suddon increase in temp. here I didnt know if it went bad. If I remember right, that is under the hose where the coolant hose and oil line attach? 3 bolts I think?

Does the water pump commonly go out at all? I mean, its not a plastic impeller is it? I used to have a vw and I know those and audis use junk plastic ones that implode after about 80k miles.

 

hhheeeeeeeeeeeeeeellllp

I changed the thermostat out last night, and still have the same issue. I am not getting coolant circulation. I started the car and dtove it around the block, the guage went up almost instantly. The hoses are not limp, but dont have a ton of pressure either(I can squeese it...how hard should it be?). The top hose is hot as hell, and the bottom hose is just warm. This tells me it is not circulating. What would be your reccomendations now? My electric fans are turning on with A/C etc. Is this a water pump issue now? Or could it be there is air in the system somehow? It never went low on coolant, just started overheating. Help please