Question about 1992 Lexus Es 300

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1992 es 300 lexus heater is blowing cold

Could a heater control valve cause the heater to blow cold air

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. Yes it could. some are vacuum powered, cable powered (mechanically) or electric powered. If the valve does not open. The hot water will not get to the heater core. It could also be the thermostat not opening.

Posted on Jan 20, 2009

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Posted on Jan 02, 2017

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My 1996 Lexus ES300 ac blows cold for a while then starts blowing warm air. Then I turn it off for a while


There are a number of possibilities.
1. If the compressor has a clutch, do you hear it engaging and disengaging?
2. The valve controlling the hot water going to the heater which mixes warm air with the cold air from the evaporator, is not working properly so it si not maintaining proper temperature.
3. THe temperature sensor that senses air temp at the intake to the AC in the cabin is defective.
4. THis is too comlicated to fix yourself, so you need to take it to an AC expert who knows this particular model.

I have 2000 ES300

Jun 06, 2012 | 1996 Lexus ES 300

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Engine heats up but takes a long time for warm air to blow. Once working, the thermostat works fine. Sometimes, warm air starts to blow and then goes cooler.


low fluid level or heater control valve may need replace..check hoses going to heater core...if cold...between heater control valve and heater core..replace control valve

Jan 11, 2011 | 2003 Toyota Matrix

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The a/c unit comes on cold then it blows hot air whats wrong


either low on gas ,or a fault with the flaps?? check the pipes in and out just behind the bulkhead where the ac pipes goe through and their should be a restrictor valve that only allows a small amout of gas through and this causes the cold ,check these pipes ,one should be hot and the other cold ,if when you start up they are correct then nothing then its a faulty restrictor valve ,or the compressor ,if they stay hot and cold then its a problem with the heater controls or the clima computer if it has one ,also check the fan is coming on when the ac is turned on because if its not then its not cooling the gas in the rad and it will shut off the pump ,then it will not cool ,just like you describe

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1 Answer

A 1992 lexus es300. the fan appears not to be blowing.


you need a FAN temp control switch or relay or run a toGGl switch

Feb 28, 2010 | 1993 Lexus Es 300

2 Answers

2003 Grand Prix not blowing hot air. Does the heater coil need to be replaced? If so where is it located?


If the heater coil was bad, it would be leaking radiator fluid... probably into your dash/floorboard (depending on where it is installed in your model car). There is a switch that diverts the hot radiator fluid through the heater coil when you want heat. There is also an air diverter valve that helps to mix the hot and cold air. The fluid valve is controlled by the A/C settings control. The one that you use to choose between heater/air conditioner/vent/ defrost. The air diverter is controlled by the temp mixing controller. The most simple explanation is that one of those valves or the controller of one of those valves is not working. If the hot water cant be diverted through the heater coil, the coil can't exchange the heat (warming the air). If the air diverter (hot/cold controller) cant move to add heat, then all you will feel is air from the vent side (from outside) or from the A/C cooling the air.

I would guess that its either a controller or one of the valves themselves. Odds are, it is a controller. That tends to be what malfunctions first.

Feb 25, 2010 | 2003 Pontiac Grand Prix

3 Answers

Would the heater control valve malfunctioning make the engine overheat blowing hot air out the heater one moment,then not blowing the hot air, temp gage spikes 225 plus. The motor takes awhile to heat up...


Heater control valve malfunction will not cause engine to overheat unless coolant is leaking externally...Overheating going down the road can be the result of a few different things...Partly clogged radiator...Insufficient air flow due to possible fan problem...External coolant leak...Make sure fans are operting properly and have cooling system pressure tested for leaks...Gaining and losing heat on the inside of the vehicle usually means system is low on coolant but you must find out where coolant is going

Jan 06, 2010 | 2004 Chevrolet Impala

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