Quote:
Originally Posted by DeSH
It's hard to say for sure. Could be a bad thermostat. I would replace the thermostat, flush and put in new fluid, then see where you are at.
Are you sure your temp gauge is reading correctly?
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I agree with changing out the thermostat, it is easy to do. I would also recommend checking to the coolant level in the intercooler/heat exchanger. These sometimes boil off coolant and run low. This is also kind of hard to bleed and get full. I have changed out my heat exchanger twice(once for a Ron Davis, and once for an AFCO) and I was refilling it every few days until it was full.
I have also swapped out my radiator(Ron Davis) and thermostats(Lingenfelter 170* and now 160*). Let us know how it works out.
Also the radiator should be almost full.

You need room for expansion when the coolant gets hot.
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Corvette Z06/Z07/M7 (2016) Late Model Racecraft Intercooler reservoir and 160* Thermostat.
Sold- 2013 Camaro ZL1 M6 (Black on Black), Detroit Speed Sway bars, DOT 4 Brake Fluid, separate clutch master reservoir, Moroso Catch Can. 2.11 at Thunderhill 100* ambient. Ron Davis Radiator and AFCO Heat Exchanger installed after track day, Roto-Fab CAI.
Sold- 2001 Mustang Cobra -Griggs GR40,M5, Torsen T2-R, 4.10, 14" Brembo fronts, high 1:40s at Laguna Seca