- Buick Ownership
I always have the exact same problem as this in WINTER. Trmperature guage pegged down to cold, fans running continuously, engine code light on and in this case is that totally asinine block heater thermostat. It prevents the block heater from coming on unless it is -18C or 0F or colder and I chopped that garbage off! It was about -15C and I plugged in, Bing on comes the light, temp guage showing very cold and fans running non stop while driving. First thing I thought is a bad sensor or worse wiring etc. after all it is a POS Buick. Tests revealed correct coolant temp, properly functioning sensor and a call to the local Pewick dealer where I was asked if my block heater cord is damaged? I said what does this have to do with the price of rice in China? The car runs fine except for the above mentioned. Again the block heater mentioned and then I was told about the engine off timer, engine coolant being warmer than it should for being of for X amount of hours, and of course the intake air temp being above -18. The ECM thinks the engine is overheating and trips a code and runs the engine in preservation mode. Yes it is now spring and this is yet another thing to keep in mind having the identical symptoms mentioned as earlier. When I drive a GM product I always bring my code reader along!I have this same problem however it only happens when it is cool outside. Like 50 degrees once the outside temp is higher it goes away?