Question about 1994 Chevrolet Astro
I've had 2 Astros. A 1993 and a 1994, and had a problem with the heat/AC on both of them. They blew only air through the defroster no matter where I set the control, heater, A/C, floor or vent.
Both times the problem was with the VACUUM hoses in the engine compartment. The hoses had become dry, brittle and then cracked. The hoses are black tubes about the size of a drinking straw, and about 12" to 14" in length. Look for hoses that are hanging loose, they usually break off from junctions where 2 or 3 lines come together.
Posted on Oct 16, 2008
The "head" unit the piece in the dash is commonly bad and causes this problem,
Posted on Aug 07, 2008
Check that the flap to switch it from heat and ac working. it is on the heater duct probley buy the heater core it eather broke one of the pins to hold it in place or is not gitting vacuum to switch it or the head unit ( temp control unit ) is bad. on the front dash there is vacuum lines going to it in the back maby one of them are off or broke or cracked hope it helps you
Posted on Sep 29, 2008
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