Question about 1999 Lexus RX 300

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I have 2000 rx 300 it has no heat inside the car i fush the heatercore change the thermostat i stiil do not have heat what can be the problem

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You may have a faulty heater blend door motor or the door may be stuck!!

Posted on Oct 06, 2010


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I am having a problem with heat in my 99 RX300. When I turn it on, it blows cold air. I can't seem to get the heat to come on...

Check coolant level, if that is acceptable,, then the problem may be a thermostat or the deflector mechanism inside the heater which should be checked by a qualified mechanic.

Sep 23, 2011 | 1999 Lexus RX 300

1 Answer

Low coolant light flashed stopped topped reservoir read label wrong saw dont fill engine damage can back on road an check engine popped on pulled over wound up losing two or three litres out...

Your most likely problem is a bad head gasket.If you used the bleeders to remove the air from the vehicle and your are sure you got all the air out and you still have no heat and the coolant keeps coming out the over flow bottle.Then the head gasket is bad.Usually the rear head head.But I have also had the front head go bad.The best is to replace both gaskets.You should also have the heads checked to make sure they are not warped if the engine ran hot.Hope this helps.Good luck.Let me know if you have anymore questions.

Mar 21, 2011 | 2000 Chevrolet Venture

1 Answer

Lost all heat inside my car but my car is not over heating or i dont have any leaks inside my car and i already replaced my blower motor resistor

change your maybe stuck.or there maybe an air pocket in the system take the hoses off the heatercore and run water threw the core with a garden hose.gookluck

Jan 16, 2011 | 2003 Ford Taurus

1 Answer

How yo change the heater core

are you sure its the heater core whats it doing i would check few things before digging out the heater core its not a easy task heatercore check thermostat if heater blows warm or cold air replace thermostat make sure you have the controls on correct settings inside of car make sure you have proper water levels in car let me no then ill tell you how to change heatercore

Dec 13, 2010 | 2002 Dodge Stratus

1 Answer

My heat is blowing cold air.

Could be a number of issues:
Low Engine Coolant
HVAC controls,
or Heatercore.

Check in this order:
Make sure your engine coolant is not low!

Does your engine heat up to the proper temperature? If not, change the thermostat.

To check heatercore try this:
Keep your air turned off, after the car's engine is heated up nicely, turn the heat on and see if you get some heat for a short while. If this happens, your heater core is plugged.

Hopefully one of these help fix the problem for you as diagnosing the controls is harder.

Nov 29, 2010 | 2002 Kia Spectra

1 Answer

My coolant fan only works with a/c on, but not heat car running hot

Have the coolant temp. sensor check out, sit by thermostat housing.If you unplug it and fan comes on, more then likely bad sensor.

Nov 23, 2010 | 2000 Lexus RX 300

1 Answer

Heater doesn't work with my 2000 Lexus RX 300. a/c works fine but no heat even when I set the temp to 75 or higher

Possible air bubble trapped in the HVAC unit so the heat from the engine is not getting to the heat exchanger

Apr 16, 2010 | 1999 Lexus RX 300

2 Answers

Not enough heat coming out


Sounds like a flap problem on heater unit.

Get your head under the dash and check for movement, when you operate temp control hot to cold.

Good Luck !


Feb 03, 2009 | 1998 Mercury Sable

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