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I have a 98 GMC Sonoma and the A/C will not work. It only blows heat even when its in the Max A/C position. Do you think this could be the blend door actuator? It is manual not automatic

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Yes - a blend door is definitely a possibility, especially if it blows heat. If the A/C was low on freon - the temperature would be at least ambient temperature.

Posted on May 27, 2011

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Posted on Jan 02, 2017

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My 98 Buick Park Avenue has driver and passenger AC settings but the passenger side always blows hot air. Very cold on drivers side. Why??Can't stand the heat even when vent is closed.


Try unplugging the battery for 5 min's to re-sync the dual climate controls. If that fails it is likely that the air temperature control blend door is sticking to in the heated air position, this is either due to the door being warped and sticking inside the duct work or the electric actuator for the door being defective, both are usually replaced.

Jun 21, 2017 | Buick Cars & Trucks

2 Answers

Heater blows only cold air


Air Temperature Control Blend Door Failure No Heat or no AC (dependes on where door sticks)

In all modern cars there is a tiny DC electric motor driven gear drive that moves a plastic door that blends heated and cooled air from the AC and the heater core, this is called (interestedly enough) the air temperature control blend door actuator. The motor that moves this door fails because the door starts sticking from warping, most common complaint is no heat but it can be no AC as well. To replace these parts (blend door and blend door actuator) you must remove the entire dash from the car. Always have this problem confirmed by a dealer or qualified repair shop as it is a very expensive repair.

Other causes of no heat in the cabin are engine thermostats that are stuck open (engine runs cold) or air bubbles in the cooling system.

Dec 27, 2012 | 1999 GMC Sierra

1 Answer

1998 gmc surburban. front blows 82 degrees, rear blows 48 degrees. ambient is 91 degrees. this is with max-recirc-full tilt.the valve for the heater core does not change position no matter where i put the...


Hi John,
Your right with your diagnostics, you have a blend door problem. If your switching to cool air and it is still hot then you also have a heat exchange unit fault, this is the component that changes the water flow from hot to cool by shutting off. If it is not operating correctly this will give you constant hot air no matter where you temperature switch is positioned.
As for the warm air while the engine is cold, sounds like the blend door is still open to atmosphere tempreture and if it is hot outside will pull that hot air into the inside of the vehicle.
Have the heat exchange valve checked, and the only way the check blend door operation is to remove the wiring from the blend doors and have the circuit tested. If the circuit is ok then the blend doors will need to be replaced.
Hope this helps

Jul 24, 2011 | 1998 GMC Suburban

1 Answer

My 2001 gmc sonama heater doesn't work ..only blows out cold air...what's wrong?


This no heat problem is one off two things, you may be low on coolant and its not flowing into heatercore or the actuator motor that controls the blend door is bad, the blend door is a door in the heater boxs that opens or closes to give you hot air or cold.

Dec 09, 2010 | 2001 GMC Sonoma Extended Cab

1 Answer

'98 jimmy blows heat only, whirring noise behind glove box when problem started


That is your blend door actuator replace it and your air will work just repaced mine the other day.

Mar 30, 2010 | 1998 GMC Jimmy

1 Answer

No heat in 98 jimmy. Replaced water pump,


Possibly.. the actuators which operate the doors actually have a position signal for reference, but the actual motors inside the actuators dont realize there is a limit and overshoot their limits causing the fine wires inside to rip apart rendering the actuator scrap but this happens when actuators are still plugged in to the connector while being taken off the heater door, and they can and will still move with the key in the off position if the actuator thinks it not in the proper position..thats how they work anyway.hope you had them unplugged untill the last, then this would'nt happen....hope this explaination helped

Dec 06, 2009 | 1998 GMC Jimmy

1 Answer

98 Jimmy Blend door cycling


I have the Heater/blend door to replace the old one in my 98 gmc jimmy. I cant get the part to slide on the shaft. Any ideas?

Mar 21, 2009 | 1998 GMC Jimmy

1 Answer

My air blows hot even tho my climate control is on cold


U have a stuck air temp control blend door, either the actuator motor is defective or the door is warped and has jammed, one thing is that u must remove the dash to rcheck replace these parts.

Mar 10, 2009 | GMC Sierra 1500 Cars & Trucks

4 Answers

The heater still won't work after I changed the thermostat on my


Get a female garden hose adapter from the local hardware store. Disconnect the heater hose from behind the fan pulley and attach the hose connection. Disconnect the other heater hose behind the alternator, aim it towards the ground and flush water through the heater core. This worked on my truck.

Feb 12, 2009 | 1999 GMC Sonoma

1 Answer

Heater does not work


Check blend door motor for proper operation (vacuum operated) if necessary, detach arm from heater box and move by hand. If you have heat then, change motor! You are reaching operating temp for engine, right? If not, thermostat is stuck open... Change.

Dec 22, 2008 | 1998 GMC Sonoma

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