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98 Bravada. THe servo for the HOT/COLD blend door

HI, I have a 98 Bravada. The servo for the HOT/COLD blend door keeps moving back and forth. and making funning noise. IT know stays on hot! Is this the blend door problem or somthing diffent ?

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Posted on Jan 02, 2017

shadtremonky
  • 353 Answers

SOURCE: 98 Bravada blows hot air out all the time

check for a vacuum leak at the actuator under the hood

Posted on Jun 24, 2009

  • 13 Answers

SOURCE: 98 s10 blazer. i need step by step instructions of

dont pull the dash out, i had exacly the same problem and pulling the dash out is too risky and complicated, 1)just take out the glove box,2) with a very small 5.5mm cube take out the screws holding the blend door motor it only has about 3-4 screws, its a very tight fit but it posible,3) once out put in the new one, or get one from the junkyard (much cheaper). hope this helped

Posted on Aug 10, 2009

  • 1 Answer

SOURCE: Replace Blend door on 2004 Suburban

My problem is hot air on the drivers side, cold on Pass when the AC is on...2004 Sub

Posted on Nov 06, 2009

  • 1 Answer

SOURCE: 01 silverado blend door changed /now works back wards!!!

were the a/c blend door is located in 2002 chevy silverado

Posted on Mar 05, 2010

  • 228 Answers

SOURCE: 1999 olds bravada climate control problem. Whether

There may be a vacuum leak,in the control head,or the supply to it or even to one of the vacimn motors that controls door opening! The vaumn reservoir may be leaking and or the check valve! Does it cool ok at idle or at low speeds and partial throttle opening?

Posted on Sep 02, 2010

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1 Answer

How can I troubleshoot the climate control when the drivers side gets cold and the passenger side stays warm when both controls on max cold. I have removed the glove box and can visualize three servos


one of the modes or the temperate blend door/motor, if you ccan reach them, remove each one and check for one that flaps back and forth way to easily. the door usually breaks from the motor pivot causing it not to move when changing settings

Apr 24, 2014 | 2004 Volvo XC90

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Air conditioning does not blow cold air in my 2004 nissan x terra


If your a/c compressor kicks on and your manifold gauges show proper hi/lo readings then I would inspect the blend door. The blend door is a motor that moves back and forth when u set the temp for hot or cold . In your case, it may be stuck in the same position. The blend door is located in the dash, usually behind the glove box or in that general area. I hope you are able to fix your problem. Scott

Jan 22, 2013 | 2004 Nissan XTerra

1 Answer

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.

Nov 17, 2011 | 2001 Ford Ranger Regular Cab

1 Answer

1998 Jimmy with electrical controls for temperature. Replaced Themostat, Flushed heater core, replaced damaged vacuum lines. Vehicle produces heat to heater core but only luke warm interior temp. Rotated...


Suggestion: see if the blend door opens or closes completely to allow all air through the heater core. To see the blend door moving, remove the panel that says "Cut here for service" under the hood along the firewall. I have a 99 Bravada where the blend door keeps moving back and forth constantly. Changed the blend door actuator but still keeps moving. The air inside is only warm since the door keeps allowing bypassed air through.

Jan 04, 2011 | 1998 GMC Jimmy

1 Answer

Still looking for a solution for my 98 Olds Bravada. Will only blow hot air. We've changed the blend door motor. Still only turns to the hot side. We've changed the Climate Control Head and the blend door...


Check your wiring with an ohm meter. Also ckeck the plugs at both ends and make sure there aren't any pins pushed out or bent. And just to throw this in, you may have bought a bad motor. You have other motors on the plenum, try swapping them to see if you get results. If they are accessible. Good luck

Oct 04, 2010 | 1998 Oldsmobile Bravada

1 Answer

2 vents blow semi cold aair and the other 2 blow hot air


You have a blend door issue under dash. Also possible blend door actuator motor may have failed. Try moving the mode select dial on control panel back and forth and listen for air sound change under dash at both sets of vents. If do not hear air flow change door is not moving.

Jul 21, 2010 | 2001 Volvo S60

1 Answer

1999 f-350 with a 7.3 diesel, turned heater on can't get temp control to switch back to ac. blowing both hot and cold air. Thanks


possible blend air door motor stuck, try tapping lightly on the servo motor while moving the temp selector from hot to cold,

Jan 22, 2010 | 1999 Ford F350 Regular Cab

2 Answers

I have a 98 olds bravada. i have it on ac but hot


Does the AC come on and stay on? If so it will be either in the heater control head or a blend door or blend door motor!

Aug 13, 2009 | 1998 Oldsmobile Bravada

1 Answer

What could cause the heating to pack up in my 98 corolla?


Try it again today, if no heat, move back & forth from cold to hot, and bang with hand, under dash on passenger side where heater duct work is and wait a few seconds. Blend/air door may be stuck.

Jan 25, 2009 | 1998 Toyota Corolla

1 Answer

No heat, when I turn on heater- all cold air flows out


sounds like you have a stuck blend door in the HVAC system. If its not controled by vacuum the servo motor is bad or the vacuum line is bad. This door moves back and forth to go from vent to floor to defrost. and you have one to go from cold side to hot side. Hope this helps you

Jan 17, 2009 | 1999 Buick Regal

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