By holding the gas pedal down, the throttle plate allows more air to enter, indicating a possible rich condition. This makes a suspect coolant temperature sensor that is bad. The gauge reading supports this theory.
The cooling system needs to be addressed. IF the
radiator is cracked it isn't going to build pressure. Replace it. Only fill the cooling system with a 50/50 concentration of straight coolant to water ratio.
IT may be benifical to check for any codes in the computer. While there are other possiblities, this is where I would start.
Tuesday, July 7th, 2009 AT 5:45 AM