1999 Chevrolet Tahoe "heat air flow" Questions

heat only, the air flows from the defrost vents. When selecting dash flow, air flows from the dash vents. the temperature controls function correctly in that I can choose cooler or warmer air... but I

...air flow. heat in winter, ac in summer. I have had the compressor changed, blower motor changed, switches, cylinoid, and the blender motor replaced. It will work for 10-20 min then it just does not ...

the temperature regulation & heat/demist air flow vanes are operating correctly, Check motor operating temperature is as per specification- if motor running too cold replace the coolant thermostat

...heat blowing but heat is blowing from the back Make sure the directional gate on the core isn't jammed or something isn't broken. It allows air to flow over the heater core or blocks it for cold

...fan should switch on at a stop at idle for the condensor to disapate the heat. If the fan doesnt come on not enough air flow will keep the system hot. A low freon level will compound this

...heat for the first 5 minutes then it begins to blow cool air. The temp guage on the inside of the vehicle consistently shows a temp of about 195 degree, just left of the 210 degree reading. The surge ...

...heat probably the heater control valve in the engine compartment usually mounted to one of the heater hose , the valve is broken internally and allowing hot water to constantly flow into the heater ...

...air in the front when I have the heat on . I was wondering if the controls might be bad. the system for the back works great and gets hot. if it's not the controls is there something else that could ...

heat out of floor vent or defroster Under your dash you have a motor that moves a door that will change the air flow from defrost,to vent ,to the floor mode. This is not functioning properly. I am not

...air conditioning and heat. Throughout the summer the air would blow hot, have replaced battery, also periodically disconnected it. It sometimes blows cold air, then switches to hot. Actuator maybe? ...