Question about 1999 Chevrolet S-10 Pickup

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Where is the blend door motor on a 1999 Chevy S-10? I can't change between hot and cold air, only the cold side works.

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Under dash, left end of heater box above gas peddel.

Posted on Jun 23, 2009

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Heater won't work in my 2005 Chevy aveo. I've changed my thermostat already.


MOST LIKELY A BLEND MOTOR ISSUE , LIL MOTORS IN DASH OPEN AND CLOSE DOORS TO MOVE AIR HOT OR COLD

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1999 chevy silverado heater fan only blows cold air , both coolant lines in are hot


I like that you were knowledgeable to check both coolant lines tells me you are getting hot coolant through the heater core next thing to check will be the blend door on the inside of your vehicle. The blend door is a door that switches from cold air duct to heater duct depending on what you are using at the time. If it is stuck on the cold air duct you will not get any heat sometimes these doors are vacuum actuated and sometimes they are electrically actuated most the time you are able to see the movement of the motor from inside if you don't see any movement but you hear it move chances are it is the door blend I hope this helps.

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Heater doesn't get hot on 96 chevy truck. Blows good, just cold. Replaced thermostat, flushed radiator. Any ideas?


Air Temperature Control Blend Door Failure No Heat or no AC (dependes on where door sticks)

In all modern cars there is a tiny DC electric motor driven gear drive that moves a plastic door that blends heated and cooled air from the AC and the heater core, this is called (interestedly enough) the air temperature control blend door actuator. The motor that moves this door fails because the door starts sticking from warping, most common complaint is no heat but it can be no AC as well. To replace these parts (blend door and blend door actuator) you must remove the entire dash from the car. Always have this problem confirmed by a dealer or qualified repair shop as it is a very expensive repair.

Other causes of no heat in the cabin are engine thermostats that are stuck open (engine runs cold) or air bubbles in the cooling system.

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1 Answer

1997 chevy silverado blows hot air only through vents


If you know for a fact the compressor is running and one of the lines is cold, I would look for a blend door problem. The blend doors direct air thru the heater and evaporator.

Aug 31, 2012 | 1999 Chevrolet Silverado 1500

1 Answer

How come when i turn heat on. driverside blows hot but passenger side blows cold


talking from experience there can be 2 problems , either the "blend motor" on the driverside of the air register has failed or the door inside the register broke i would say 9 out of 10 the "blend motor" is the problem , on a scale of 1-10 its about an 8 to change the dealer refers to this part as a blend door actuator

Nov 20, 2010 | 1999 Buick Regal

1 Answer

Ac blows out the defrost side 1999 grand cherokee I-6 engine


these were common for the blend air door breaking around the pivot side. They would break clean off and not allow the switch of cold air to hot air etc. This can easily be dtermined by having a technician scan the HVAC module and a code will be "blend door range too large" then you know for sure either the actuator motor, or the blend door is broken. Either way, its 10 hours labor, minimum, at a shop. Simply because the entire instrument panel (dash) has to be removed from the vehicle and lay across the front seat. Then you can find access to the heater box and remove it. Only then can you replace the necessary doors, and actuators. Its very labor intesive. Good luck with the repairs.

May 21, 2010 | 1999 Jeep Grand Cherokee

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My heat works on the passenger side and not the drive i've changed the thermostat and still the problem hasn't changed


If you have good heat on one side, it can't possibly be the the thermostat. Good heat on one side means that there is plenty of hot water (water and antifreeze mix) circulating through your heater core. The thermostat controls the temperature of the water. If you have hot water, the thermostat is not at fault. Your Impala is equipped with what is called "zoned climate control". All the inside air (both sides) is still heated by the same heater core. The difference between a "zoned" system and a conventional system is that there is more than one "blend-air" door insided your HVAC housing. The blend-air door swings back and forth to direct the incoming air either through the heater core (for hot air) or around the heater core (for cold air) The drivers blend-air door may be broken or the motor that moves the blend-air door is malfunctioning.

Oct 10, 2009 | 2005 Chevrolet Impala

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1997 F150 heater problem


your problem is caused by the air temperature control blend door actuator motor being defective, the little motor moves the door that gives either hot air or cold air or a blend of the 2.

Feb 21, 2009 | 2004 Ford F150

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2002 Lincoln Navigator. Heater is not working, it blows cold air. I had the thermostat changed and it stills blows cold air. There is no water leaks under the dashboard. It takes about 10-15 min for...


try changing the thermostat if thats not it check and see if you have water leaking in the passenger side floor board if so then you need a new heater core

Jan 05, 2009 | 1999 Lincoln Navigator

3 Answers

Blowing cold air


I had the same problem that I just fix by flushing the heater core out with a hose.   take the two hoses off the fire wall and put the water to it and let flush.  my heater is putting out 150 dg. F  of hot air.   I'm so excited!  i will stay warm now.

Dec 22, 2008 | 1999 Chevrolet Silverado 1500

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