Stranger Heating Issue
My Chevy cobalt is an LS model 2006 with 135,000 miles. I am experiencing a strange heating and possible almost overheating issue. When I'm traveling at regular speed without too much stopping my car will maintain a temperature of around 180°. When I am in heavy stop and go traffic my cars temperature will climb to 223°, the thermostat will open and the fan will kick on, the temperature will decrease to around 210°, then will rise back to 223°. This process will repeat until I either get back to regular speed or turn the car off. In this sort of heavy traffic my temperature will not decrease back to 180°.
I have replaced the thermostat twice since owning the car. Right now the current thermostat is an aftermarket unit. I have flushed the coolant system many times and I replace the fluid once per year. I live in a very warm weather environment.
Additionally, the heater core went last year, and I bypassed that system with a hose. That hose doesn't show any deformation or wear and tear.
So, does anyone have any thoughts? Is this normal, abnormal, could it be a radiator, the hose i used to bypass the heater core, The radiator fan, or something else entirely? Thanks very much.
Last edited by heilo99; 05-06-2016 at 11:09 AM.