Question about 1991 Chevrolet Caprice
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Posted on Jan 02, 2017
SOURCE: the blend doors on a
i had the same problem on my 95 s10. there is most likely a vacuum line that came loose under the hood near the firewall on the driver side. that solved my problem.
Posted on Aug 11, 2008
In the following diagram part 14 is the heat valve (door). I suggest that you attempt to manually actuate the valve by rotating part 13 the valve shaft by hand and see if heated air starts flowing. You may find when you examine part 13 that either the cable is detached, or by feel/sound that the shaft is not moving the valve (door) inside.
Posted on Feb 06, 2011
SOURCE: The driver side only blows
Yes it is most likely a vacuum actuator there are more then one . They open and close little doors in the ducts to deriect air flow inside the ducts . They are not easy to get at in most cases however you should look at all vacuum lines going to and near the unit its controlled by engine vacuum . exhust all other opptions first before takeing the dash out . The problem could also be electrical check the control switches make sure the switch is not bad on one side . Spend some time looking and thinking before you start riping things apart. Good luck with it
Posted on Sep 18, 2011
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Dec 26, 2015 | Chevrolet Monte Carlo Cars & Trucks
Apr 02, 2015 | 2003 Chevrolet Tahoe
Temperature Control Blend Door Failure No Heat or no AC (dependes on
where door sticks)
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.
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