1995 Chevrolet Tahoe Q&A
1995 Chevrolet Tahoe Question: Truck has no heat while driving down the road ... why?
I just picked up this truck and has no heat I changed radiator cap and thermostat but did nothing has heat at idle but loses it as you drive down the road was told it could be a number of things like heater core... water pump.. bad head gasket... well I eliminated the head gasket so far the system pressure checks good but I have no heat... the passenger side vents don't work when the heat is on but if I turn the ac on they vents work.. but there is a lot of air blowing around the blower motor area.. please help - Tahoe_man89
Does the engine temp increase when driving? Could have water pump impeller issue thus not properly circulating the coolant.... If engine temp lowers while driving you may be missing the thermostat causing the coolant (antifreeze) to cool to quickly. Although it could be a number of other possibilities or combinations. I'm local if you have any further questions. - ASE Master 2001
Have it checked by a mechanic!! - pushrod
what temp therm did you install? poss blockage in heater core heater control valve is bad - globalhelper