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Chevrolet
Suburban 1500
186

Improper HVAC Temperature and/or Air Delivery Due to Failed Mode Door Actuator on Chevrolet Suburban 1500

Problem Description and Possible Solution

One or more heater & AC (HVAC) air delivery and/or temperature mode door actuator may fail. This can result in incorrect air delivery or temperature. If this occurs, fault code(s) stored in the HVAC control module should be available to assist with diagnoses.

Problem Data
RepairPal Verified
Average mileage: 139,684 (15,500–288,000)
18 model years affected: 1992, 1993, 1994, 1995, more1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
186 people reported this problem
Comments
Viewing 1 - 20 of 71 comments
Actuator door quit working and would only blow hot air on driver side and cool air on passagner side when in ac mode.
2003 suburban z71 with duel climate control and rear controls no heat in front or rear sometimes rear will blow warm if reving rpms countinously. , blows cold air out of vents. When cycling the duel climate control levers up and down there is a change in air flow but not temp. Have flushed coolant system , replaced thermostat and flushed out heater core and water runs through freely. There is a clicking sound from under driver side dash coming from an actuator but all blower fan modes work. Just no temp control.
Drivers side a/c switches to heat, while passenger side blows cold.
Replaced drivers side door actuator, did not fix problem.
Turning the a/c off then shutting off car and restarting will reset all doors and actuators, fixing the problem temporairly.
Cooling only works on upper setting. The heater will only work when the car RPM are increased and will not heat the back vents at all. There is a continuing clicking sound coming from the dashboard.
The door controlling the air to the defrosters and the floor will not work. Heat comes out but will not go to the defrosters.
Occasionally hot air would start blowing on driver's side, but nowhere else. Stopping and restarting engine would fix it. This happened about twice to four times a month, until the alternator went out, and now it does it full time. This is the first day and after doing some research tonight I plan to disconnect the battery tomorrow to reset the door blend actuator and see what happens. But I haven't seen anyone else mention an alternator replacement being the trigger for this, and I want to educate myself before a mechanic potentially decides I need a new compressor.
Driver side Air cond turns to a high heat ---passenger side is fine --this is not a very good condition to have going across the Bonneville Salt Flats in 95 degree weather. I have had 10 suburbans and this one takes the cake -- I have had more problems with this one than all the others combine---the one that makes me most upset is the speedometer --with a $600.00 price take to repair plus removing the whole consul for a week or so. I wish the engineer that thought this one up had it stuff where the sun don't shine along with there fuel pump in the gas tank.
Heat is intermittent on drivers side. It will mostly blow cold on the drivers side while the passenger side and rear are working correctly. Sometimes you can hear the door open and it will blow hot air as it's supposed to do. No problems when AC is selected - only heat.
Front HVAC only blows out windshield defroster vents, nothing from dash vents or foot vents. Temp controls are fine and blower speed is fine, just vent selection.