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blend door

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Question
How much to flush out system cause car has no heat
The heater core being plugged is not the most common cause for this vehicle to not give heat out of the vents. If you move controls to heat and do not notice a temperature change when turned hotter the most...
Question
Heating the cab area
You need to check the temperature blend door actuator on the heater blower case behind glove box to see if the motor is moving the blend door to control the interior temperature. If it is not moving door then actuator...
Question
Ac and heat only blows when moving.
Hi there. Check the blend doors to the vehicle and see if they are working. It seems that the blend doors are stuck to the outside air only, but passing through the heater core. Look for any vacuum lines cracked,...
Question
I am having issues with the defroster blowing cold air on the driver side
Hi there. There is a blend door issue on your ducting to your heating and air conditioning system. Check all of the blend doors and make sure that they are working. The blend door that is not working properly can...
Question
Why is my car blowing hot air and cold air at the same time?
The answer to this depends on whether you have switched on heating, cooling (A/C) or neither. In one scenario, for example, if you have not switched on the A/C system, but the A/C is running as confirmed by a visual...
Question
I have a 1999 chevy Tahoe that only blow air from the defrost vents. How can I get the air to blow in your face of feet?
The control actuator that moves the door to control this may have a wiring connector issue due to connections at control head and actuator wiring was miss routed and it pulls the harness connector wires too taught. You should disconnect...
Question
No heat from vents floor defrost
The first thing to check is to see if both heater hoses are getting hot and staying hot. Then from inside temperature controls check to see if the inside air temperature can be adjusted up and down. If temperature stays...
Question
Problem with cabin vents in Nissan Qashqai 2013 1.5Dci (Dual climate control)
Hello. Thank you for writing in. The climate control utilizes a duct system and blend doors to control the temperature of air entering the cabin. If these blend doors are not mixing the correct air supply than the air entering...
Question
My oil light does not come on when the oil is low, and the heater only blows hot air for a short time.
When the oil pressure drops lower than 8 psi, then the oil light will come on. If the oil pressure drops and there is no light, then check the oil pressure sensor harness for power. If there is power, then...
Question
Where is the Heating A.C. door actuators2 Lesabre Custom with manual control.
It is attached to the HVAC assembly behind the glove box. Sometimes you can remove the glove box and access it and other times you will need to remove a good portion of the dash. This is determined on a...
Question
Hi! I Was driving on the highway with the A/C on and noticed some fumes/smoke coming through one of the vents and it smelled like exhaust.
Hi there. Check the blend doors to the air conditioning and heating system. If the outside blend door actuator is not working properly or if it's open to the outside air, it will draw air from inside the engine compartment....
Question
A/c stopped working
Hello there, many faults will cause your 2000 Chevrolet Impala to have no air blowing from the vents and the air conditioning not function. When no air comes from the vents at all under any settings the problem is likely...
Question
Air conditioner blowing hot air on drivers side
If the air conditioning system is on and vent temperatures are as expected for a/c at certain outlets (typically outlets would measure around 35-40 degrees below outdoor ambient) yet the air blowing from other outlets is "warmer" or indeed "hot",...
Question
Chevy captiva 2014. A/C running warm. Will not recirculate. And even though I have it on face vents, it blows thru them AND bottom
Hello, thank you for writing in. The vehicle is likely having more than one issue at once. The blend doors control the flow of air through the vents and the cabin. If they are unresponsive, you may have one of...
Question
Clicking when A/C is on
The temperature or mode a/c doors in the dash heater air conditioner doors have electronic actuators that when they go bad may start to click when the a/c is turned on or when trying to change door position that has...
Question
Climate control off by 8 degrees
Hello Dennis, thank you for writing in. The automatic climate control uses a cabin temperature sensor, blend doors, and engine temperature sensors to regulate the air coming into the cabin. There may be an issue with any of these components,...
Question
Air conditioner makes clicking sound when truck turns on, low air pressure unless max AC is used
When the engine turns on, if the A/C switch is off, the compressor clutch is not engaged so the only "noise" should be from the compressor pulley freewheeling. If the air flow is too low at the lower blower speeds,...
Question
My car only blows out hot air, can't switch over to A/c or vent. What could be wrong?
The temperature blend door on the evaporator case is most likely the cause. The actuator for the temperature door is stuck in the heat position and has failed. The actuator needs to be checked to see if it moves when...
Question
the air blower to select where the air is blowing isnt working the only thing till do is blow on the dash.
Hello, thank you for writing in. There may be one of several things happening. There are "blend doors" located in the duct work that control where the air flows. If the servo-motors that control these doors fail, or the switch...
Question
Dual auto climate control
You will need to have the blend door actuator removed and the blend door rotated manually to see if it can change the temperature on the drivers side. If it cannot then the blend door is broken inside the heater...

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