Question about 1999 Chevrolet Silverado 1500
Sounds like your heater matrix could be blocked try flushing out but when you refill system undo one hose on your matrix at the rear of engine compartment to bleed air out of matrix this should help if not it may be you need a new water pump
Posted on Jan 02, 2014
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Posted on Jan 02, 2017
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Jun 16, 2016 | Cars & Trucks
Jul 08, 2015 | Cars & Trucks
Feb 14, 2015 | Cars & Trucks
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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