98 Bravada auto climate control

cliffg8 · 09-06-2006, 07:37 PM

Just got the car back from being in the shop for 2 weeks. It will only blow hot air no matter what the control is set at. Compressor is running and line is very cold. I can hear one of the air diverter valves move when I move the temp contol. The far right control does change the air output. Just no cold air. Is there a diverter that isn't closing to cut off the hot air? How do I fix it?

atownhockey19 · 09-11-2006, 06:58 PM

maby the knob is broken...

cliffg8 · 09-11-2006, 07:11 PM

No the knob is not broken.
However I did find the problem. The actuator that moves the air mix door from the heat to cool side goes into a mode where it will not move. This can be caused my the door sticking. Under the hood on the housing to the heater/ ac unit there is an area marked. "Cut for service". After removing the area marked there is an access panel with 3 screws. Remove this panel and you will see the air mix door. I manually moved the door from heat to cool a couple times until it didn't feel like it was binding. Do this slowly because the actuator is an electric motor to gear arrangement. GM wants about $120 for the actuator. They are available on ebay for around 35 plus shipping.
Anyway, after moving the door I started the Bravada and selected a mid temp. The mix door moved to a mid way position. I then selected all the way cold and the door moved to block off the heater core. Selecting all the way hot and the door moved to block off the AC side.

If you do have to change the actuator it can be gotten to by opening the glove box all the way. There is a metal loop on the upper left of the opening that prevents the box from swinging all the way out. The loop will swing out to allow the box to open all the way (and dumping its contents on the passenger floor).
You then can look on top of the heat unit and see the actuator. It is on top back by the firewall. It is held in place by 3 screws and has the control wire plug attached. Removig the screws and moving the actuator up will release it from the air mix door. Then just unplug the control wire plug.

I hope this helps someone else.

Oldsguy · 09-12-2006, 04:52 AM

Good tech! Thanks

klenard · 10-21-2006, 08:42 AM

Moved the door a few times......heater works again

09-06-2006, 07:37 PM	#1 (permalink)
cliffg8 Junior Member Join Date: Sep 2006 Posts: 5	98 Bravada auto climate control Just got the car back from being in the shop for 2 weeks. It will only blow hot air no matter what the control is set at. Compressor is running and line is very cold. I can hear one of the air diverter valves move when I move the temp contol. The far right control does change the air output. Just no cold air. Is there a diverter that isn't closing to cut off the hot air? How do I fix it?

09-12-2006, 04:52 AM	#4 (permalink)
Oldsguy Administrator Join Date: May 2004 Location: Lees Summit MO Posts: 2,553	Good tech! Thanks __________________ Dan '46 2 door

10-21-2006, 08:42 AM	#5 (permalink)
klenard Junior Member Join Date: Oct 2006 Posts: 1	Worked Great Moved the door a few times......heater works again

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09-11-2006, 06:58 PM	#2 (permalink)
atownhockey19 Junior Member Join Date: Aug 2006 Posts: 13	maby the knob is broken...

09-11-2006, 07:11 PM	#3 (permalink)
cliffg8 Junior Member Join Date: Sep 2006 Posts: 5	No the knob is not broken. However I did find the problem. The actuator that moves the air mix door from the heat to cool side goes into a mode where it will not move. This can be caused my the door sticking. Under the hood on the housing to the heater/ ac unit there is an area marked. "Cut for service". After removing the area marked there is an access panel with 3 screws. Remove this panel and you will see the air mix door. I manually moved the door from heat to cool a couple times until it didn't feel like it was binding. Do this slowly because the actuator is an electric motor to gear arrangement. GM wants about $120 for the actuator. They are available on ebay for around 35 plus shipping. Anyway, after moving the door I started the Bravada and selected a mid temp. The mix door moved to a mid way position. I then selected all the way cold and the door moved to block off the heater core. Selecting all the way hot and the door moved to block off the AC side. If you do have to change the actuator it can be gotten to by opening the glove box all the way. There is a metal loop on the upper left of the opening that prevents the box from swinging all the way out. The loop will swing out to allow the box to open all the way (and dumping its contents on the passenger floor). You then can look on top of the heat unit and see the actuator. It is on top back by the firewall. It is held in place by 3 screws and has the control wire plug attached. Removig the screws and moving the actuator up will release it from the air mix door. Then just unplug the control wire plug. I hope this helps someone else.