Question about 1998 Toyota Avalon

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Heater blend door stuck

Cold air coming from heater while mixing valve is ok

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It needs serivce
the tests and steps are all in the FSM. every lil details.
same at HVAC chapter.
read . login .
it may have blend motors, and are unique to al lcars, and models
as are the tests very very unique. (pin , tests)

Posted on Jan 09, 2014

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Posted on Jan 02, 2017

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SOURCE: my 2000 4 runner limited blows cool to lukewarm

Have you checked your thermostat to make sure it isn't stuck open?

Posted on Oct 10, 2009

  • 3 Answers

SOURCE: 2001 toyota senna, Heater will not come on? Blows

Check coolant level.

Posted on Mar 05, 2010

  • 52 Answers

SOURCE: Same problem: 2001 Toyota Tundra that won't blow

that is entirely possible yes, could also be a broken cable to change the temp from hot to cold, could be a problem with certain ac components under the dash

Posted on Dec 15, 2011

  • 14 Answers

SOURCE: air blend door

First check the connections at the blend dial if it is good there then take a look at the control assembly circuit board for broke or loose wires.

Posted on Jul 08, 2012

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2007 toyota camry LE 2.4L does it have a heater control valve?

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The A/C pump starts when i move heater controls to defrost or mix

Great question dustin but the A/C is suppose to come on in defrost or mix mode- this is floor & defrost. Does not seem to make sense does it. One of the things the a/c does is remove the moisture from the air. You need warm DRY air to remove the moisture from the windows. An automotive H.V.A.C. ( Heating,Ventilation,Air conditioning) first forces air thru the a/c evaporator core then thru the heater core and out the selected vent. If you only want a/c a blend door will by-pass the heater core which is controlled by a hot/cold knob or digital temp cotrol on the dash. Now back to the cold air problem- assuming the basics are all ok- Coolant is full, Engine gets up to proper operating temp-around 195 degrees- upper radiator should be hot. Both heater hoses should be hot. If thats all OK the blend door might not be working. It is controlled by an electric motor called a Blend Door Actuator which are prone to fail. I have replaced many on ford vehicles. Hope this helps

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My 1999 National Surfside Chevrolet P30 Chassis Motorhome, A/C is blowing cold air mixed with hot air from defrost setting, what is the problem?

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What could cause my truck to have no heat?

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My 2001 ford ranger heater blows out cold air,what might be my problem??

If you are sure the engine is getting up to temperature then your problem will be a part called the electrically positioned blend door and or the little motor that moves the blend door. The blend door moves back and forth between the AC core and the heater core to provide a mix of hot and cold air or hot or just cold depending on what you set the air temperature control at, blue being cold and red being hotter. This is all to common a problem on Ford rangers and Explorers which share the same components of the heating and AC systems. When the door fails it is usually on the cold setting position. The kicker here is that you must remove the dash to replace the parts, the blend door and the blend door actuator motor should both be replaced at the same time, the common reason for the motor to fail is a sticking hard to move blend door due to warping of the plastic it is made from.

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Hot air from a/c - a/c is charged but no cold air is coming out

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Hi There I have1994 jeep Grand Cher. cold air on heater, but hot cooland going thro core.The vacum sounds ok switching all directions : windchil , flor, mix up and down. but maybe the vacum is a bit to...

Hi, the blend door is not vacuum operated; however the veater water control valve is. Check to make sure the heater control valve (see pic below) is opening (vacuum motor should turn valve lever). If that's good, check the adjustment of the blend door cable. Make sure the door opens fully when the temp is set to hot. Please let me know if you have questions, and thanks for using FixYa.



Jan 19, 2011 | 1995 Jeep Grand Cherokee

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Have a 1998 dodge caravan blows cold only new thermastst flushed system new anti freeze help

Most likely the problem is a broken blend door inside the heater box or a broken adjuster cable going to the blend door, the blend door inside the heater box is responsible for heater output depending on your temp adjustment on your heater control panel, most likely the blend door is stuck in the cold position allowing cold air to come through the vents verses allowing the blower motor to blow warm air past the hot heater core to produce heat, check the temperature adjuster cable behind your heater controls and make sure its connected and not broken, lastly make sure the blend door isnt broken and operating freely.

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