1999 Lexus LS 400 "car runs defrost heater" Questions

...defrost, changed thermostat, hoses and flushed heater core, no obstructions, still no heat, fan blows air, motor good, only one hose going to heater core gets slightly warm other stays cold. ...

defrost vents had heater core replaced now wont change from defrost vents and air condictioner compressor wont run Check all vacuum lines that goto the heater control under the right side of the dash.

...defrost or heater, the compressor won't engage. When using the a/c, the compressor engages, everything is fine. Replace the HVAC head unit? the compressor should engage when running the A/C just like ...

...HEATER OR A.C. IF NOT MY CAR WILL OVER HEAT I suspect you are low on coolant. I further suspect the best thing for you to do is have your cooling system flushed and refilled ... What is happening is ...

...defrost, heater, vent switch isn't switching the control to a differnt source There is a small vacuum hose that runs along the front of the throttle body.Usually gets brittle and brakes .This ...

heater or defrost. What could it be and what do I do? If it smells like antifreeze, and leaves a film on windshield, it's probably a leaking heater core, but if not, your drain tube/passage for heater

runs very rough, or the engine dies. You can also smell something burning if the defroster is left on for very long. Not sure if the smell is a rubber smell (like a fan belt) or whether it smells like

...car DOESN'T overheat so it isn't thermostat or water pump related. I need help to figure out this problem. possibly the bled door is stuck open so only the cold air from a/c works when on defrost vs ...

...heater set on defrost this will cause your engine fan to run because it turns on the compressor for air conditioner this helps to extract moisture from your warm air defrost and the fan in the engine ...

Defroster won't blow air Heater works fine, but won't come up through the defroster. Have a piece of vinyl hose attached to the heater on the floor, run up across the dash with intermittent holes ...