Is your coolant really hot? Are you losing coolant (boil over)? Gauges
are mechanical devices which may not be correct. Yours connects to a
sensor in the coolant stream. If you are not losing coolant use an IR
gun or a touch type thermometer and see how hot the coolant is. Your
cooling fans should turn on low speed at 199 degrees and go to high at
207 degrees. The PCM will shut them off at 194 degrees.

crispycritter wrote:
> Hi, I have a 2000 Daewoo Nubira, and it has an overheating problem. It
> overheats on the freeway, after about 10-15 miles of driving at sustained
> freeway speed. When exiting the freeway, the gauge creeps up another couple
> of notches when I come to a full stop, then cools down to 1/2 way on the
> gauge when I start back up again (never goes down to where it should be
> though - half way is the coolest it gets). This is what I've done to date to
> solve the problem
>
> * Installed a new radiator
> * Installed a new thermostat
> * Installed a new waterpump (and while it was disassembled I also had
> installed a new timing belt)
> * Two separate pressure tests
> * PH Balance test (whatever that is)
> * Verified that no steam is venting from the exhaust pipe
>
> I've spent 1100.00 so far, and I'm still at square one. Car still overheats.
> It doesn't quite peg the temperature gauge, but it creeps up to near 2/3 to
> 3/4 of max after driving for 20 minutes or so.
>
> Any suggestions would be most helpful. I've combed the 'net looking for ideas,
> but everything I've read so far are things it looks like I've already had
> done.
>
> Thanks kindly,
>
> Matt