My speedo went out on my 2003 shevy 2500hd at 116000 miles.i went to start it on a cold day and it was reading 20mph in park.today it reads 70 mph in park and is reading over 70 mph over the speed that i am driving.*cn
Dt*: the contact stated when the temperature is below 25 degrees the heater does not blow hot air. the dealership inspected the vehicle several times and was unable to locate a problem within the heating system. updated 2/13/2006 - the dealer replaced the thermostat and other components to correct the problem but the problem continued. *nm