Engine Overheating

elvised77 · 2009-05-08T07:52:53+00:00

My car has been overheating for about a month. It will be fine then all of sudden jumps up and says "hot coolant temp". Then after a couple minutes or so it will go back down. I have changed the thermostat, the timing cover gasket and the bypass hose (which had two tiny holes in it) and it is fine for awhile and then right back to overheating. I would open the cap and usually run it until all the air/air bubbles would stop and then put cap back on. Well. now all I get out of the filler tube is steam and it was the temp gauge will not come down off of "hot coolant temp". What else could I be missing? When I had the timing cover gasket replaced and the bypass hose. They did all that already. So I am still at square one of why it still jumps to "hot coolant temp" and now will not come back down. What else could it be? Somebody told me the water pump. Could that cause it or no? I change water pump radiator hoses the thermostat radiator and put engine block sealant and the temp Gage still goes up and down sometimes when the Gage goes down I get heat then when the Gage goes up I lose heat

2003 CHEVROLET IMPALA

85,000 MILES • 6 CYL • FWD • AUTOMATIC

WRENCHTECH

✓Experienced Mechanic
20,760 POSTS

I don't know where you are getting your information from but that isn't even close to true. The 3.4 is one of the worst engines for blowing head gaskets if they are even mildly overheated.
You're also totally wrong on fan temps also. These fans aren't programmed to come on until approx 226 degrees.

Oct 24, 2018 at 6:30 AM (Merged)

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Engine overheating