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88 sierra electronic climate control

Ok not all the time but i can just be driving down the road or setting still and my heat/ac changes to floor defrost vent off and i lose all lights when it goes off meaning it goes crazy, but it doesnt change fan speed, or the hot or cold. any suggestions?

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  • Jordan Oct 26, 2012

    the only problem im having is it changing different settings i changed the module out and its still doing it so im thinking maybe a bad ground because its only happened like 5 times since i bought it in april of this year if any of you have had this problem please let me know how you fixed it.. and atomicjack thanks im gonna give that a try

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  • Contributor
  • 9 Answers

Vacuum hose cracked or vacuum operated diverter is bad.

Posted on Oct 26, 2012

  • Jordan Oct 26, 2012

    the vacuum hose has something to do with a electrical problem?

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Posted on Jan 02, 2017

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Atomicjack
  • 1 Answer

SOURCE: 2005 PONTIAC mONTANA-NO HEAT

Had the same problem with 03 Montana and it was the actuator assemble. It controls the hot and cold air and controls all of the other functions....defrost, floor etc...

Posted on Feb 06, 2009

alicantecoli
  • 22219 Answers

SOURCE: 2000 Mercury Grand Marquis will only blow hot air when ac is on

needs re-gassing because one line should be hot (feed) and the return cold , This is a specialist job do not attempt to do it yourself because its extremely dangerous with very high pressures involved

Posted on Jun 21, 2009

  • 87 Answers

SOURCE: 04 Chevy Tahoe Climate control issues.

HVAC control head problem or it is the air Temp Control Valve problem. THe control head is the one with the buttons and knobs and the control vavle is located on the HVAC carrier assembly underneath dashboard (two of them one on left and one on right in center). This is a job for someone who has knowledge of HVAC and electrical on a GM vehicle.

Posted on Aug 02, 2009

  • 490 Answers

SOURCE: this car has the automatic temperature control system

The hot/cold switch is probably bad.you have a blend door box that opens to let the cold air in and closes to let the hot air in.From what you are saying this part is no responding to the switch movement.Make sure power is at the switch and power should go through the switch when put on cold air this moves the blend door.Some times the blend door goes bad and has to be replaced its under the dash on the right side.

Posted on Aug 10, 2009

  • 1 Answer

SOURCE: No air/heat from Vents in 89 delta 88

1996 olds lss .no heat from vents which seem blocked.The fan runs

Posted on Dec 10, 2009

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