Question about 1999 Chevrolet Silverado 1500

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I have a 95 full size chevy truck. Most of the time, the defrost, vent, and floor work fine and sometimes it seems to hang between the different settings. I think it is either the actuator or the linkage that it moves? Where is this located at under the dash and will I have to do much disassembly to get to it? Thanks for your help.

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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johnny5846
  • 379 Answers

SOURCE: 89 chevy 2500 silverado

that was old school , vehicles with the turbo 400 transmission are equipped with an ECM controlled downshift system , when vehicle is at speeds below 70 mph a forced (detent) downshift is possible by fully depressing the accelerator ,when the ECM detects a drop in manifold vacuum (high map sensor reading) the downshift control relay is energized by the ECM , the relay detects battery voltage to the detent solenoid in the transmission to open open an oriface to force the transmission to downshift ..... if yours is not working i would first check the downshift relay , under hood , picture is so bad i can't tell , looks like on the firewall more to the passenger side , next to fuel pump relay , if it needs more diag than that maybe you should get an estimate for repair from a trans shop or such , hope ya fix it , cheers .

Posted on Jan 09, 2009

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  • 20 Answers

SOURCE: Heat wont blow through heater or defroster vents

common problem, check under dash by the gas pedal if control arms are muving went selecting from ac to heat cuz this it is the control for the vents to go from ac to heat and to defrost.

Posted on Feb 23, 2009

  • 37 Answers

SOURCE: PROBLEM WHEN SELECTING THE DIRECTION FOR THE AIR

Sounds like you have a supply vacuum problem. When you lose supply vacuum to the control head it defaults to defrost.

Posted on Mar 13, 2009

  • 28 Answers

SOURCE: Defroster & floor blowers don't work but front facing vents do

There are what they call mode door's these days they have a electrical motor that turnes the door to different posistions...sounds like yours is become broken. It would depend on your expertise in the ac & heating system area to replace the part. Sometimes easy and most of the times the dash has to be removed.

Posted on Apr 02, 2009

  • 169 Answers

SOURCE: my 2002 trailblazer is making a clicking noise in the a/c

more likely a broken door in hvac case.with car running work controls and watch actuaters operate to locate good luck maybee a little challange

Posted on Aug 30, 2009

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1 Answer

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