03 impala. shows overheat but then goes down on guage. changed thermostat but??? thermostat guage in car goes to red then back down? suggestions?

Asked by Jan 20, 2016 at 09:36 PM about the 2003 Chevrolet Impala LS

Question type: Maintenance & Repair

So rocker screw broke 6 wks ago, repaired.  1 week later, car "overheats".  
radiator cool.  Had mechanic change thermostate.  ok for a few days then,
interior engine guage gets to red, then gets back to normal, both farily
quickly.  drove today.  quick heat up over normal, then quick return to
normal and fluctuation since.  ??? faulty thermostat?  dirty sensor?  Guys
looking at head gasket but oil is clean, no cloudy color.  When reply, please
keep it simple.

2 Answers

19,455

auto parts sells a test kit for exhaust in water at radiator fill cap, a damaged head gasket will pump pressure gasses in system and cause an air lock bubble stopping the circulation of coolant , sometimes watching the coolant at fill port, you'll see a bubble of gas every second or two when running

1 out of 1 people think this is helpful.
60,905

Sounds like there's air in the cooling system. Or a defective thermostat. Try bleeding the cooling system first. If you have the 3.8 (3800 Series II) it's not going to be a head gasket. These motors rarely, if ever, blow a head gasket. They eat intake manifold gaskets. HTH. -Jim

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