this is my first GMC (2004 Sierra p/u 4800 vortec) and I thought it abnormal when it couldn't warm up at idle. The dealer replaced the thermostat but it still doesn't warm up at idle. I've driven 5 miles to work and left it idling for over twenty minutes and the gauge reads 175. When driving it will warm up to almost 210 but it takes a lot longer than my other car. If it's cold enough outside, say below zero, it will actually start to cool down if I leave it idling. I've let it idle for 20 minutes in the morning before so I could have a warm car and didn't. Is this normal? Did I get another bad thermostat?
- posted
19 years ago