Question about Cars & Trucks
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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Posted on Jan 02, 2017
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
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
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
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
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