94 crown victoria heater fan runs but no air comes out defrost
Nov 13, 2010 at 10:21 AM
no air flow out defroster
1994 FORD CROWN VICTORIA
JDCOULING
- MEMBER
- 1 POST
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ERNEST CLARK
- ✓ASE Certified Mechanic
- 1,730 POSTS
Inside of your HVAC unit are what's called "Diverter doors and Blend doors" that are controlled by vacuum solenoids.
Your issue can be with either a stuck or broken door, a bad solenoid or vacuum line. You'd have to take apart the Unit to gain access to these parts. If you're interested in doing this yourself, write back and include your engine model. I'll walk you through it.
Your issue can be with either a stuck or broken door, a bad solenoid or vacuum line. You'd have to take apart the Unit to gain access to these parts. If you're interested in doing this yourself, write back and include your engine model. I'll walk you through it.
Nov 13, 2010 at 11:37 AM
BMRFIXIT
- ✓ASE Certified Mechanic
- 19,053 POSTS
Check selector switch check for mix routed vacuum lines check door actuator on the heater box
Nov 13, 2010 at 11:41 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.