Pontiac Grand Prix SE 3800

Asked by GuruFJBBN May 08, 2020 at 12:59 AM about the 2002 Pontiac Grand Prix SE

Question type: Maintenance & Repair

my low coolant light flash on and sometimes
"Not everytime im at them speeds". The engine
will start to get a little hot itll read between the
quarter and halfway mark. But I just put a radiator
on it and got all the air out it's still completely full
of coolant I just change the oil. And the fuel filter
the other day and topped off my transmission
fluid

I have a few codes that I got from O'Reilly's
P0463
P0300
P0440

1 Answer

18,185

My '95 Bonneville did that for a while. I found a buildup of crud in the bottom of the overflow tank and the tube leading to the radiator. It seemed to be restricting flow past the sender enough to make it send a false "low coolant" signal to the computer. I cleaned that out and the problem never reoccurred. Just a thought. If the rad is full and the engine's not overheating I'd say there's nothing to worry about i that regard. Google the codes to see what they mean and what the possible problems might be. Do your homework before starting to replace parts.

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