stuck on defrost - Ford Powerstroke Diesel Forum
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post #1 of 3 Old 08-07-2009, 09:37 AM Thread Starter Rookie
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stuck on defrost

i jsut purchased a 99 f-250 and i am stuck on defrost no matter if i am on vents or floor. i get heat and ac out of the defrost. everything seems to work okay just only comes out of the defrost. any solutions. i checked the electric vacum pump and i get vacum out of it, but i don't know how much i should be getting. help please.

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post #2 of 3 Old 08-08-2009, 10:59 AM
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You're on the right track... probably is a vac. problem. Open your glove box, squeeze the sides to allow the stops to get past the dash, so you can get behind the glove box- then you will find the vac. lines and the actuator. You might get lucky and find a loose vac. tube. If not, you probably have a bad actuator or selector valve. You'll figure it out, it's not too hard.

Late 99 F250 ext. cab 4x4 Lariat 7.3
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post #3 of 3 Old 08-10-2009, 08:35 PM
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Where would i look on a E450? Same exact problem, stuck on defrost for everything AC and heat.

2014 F250 4x4 CCSB Platinum
Dieselsite water/fuel filter, Stingray 40" LED with Randy Ellis mounts, High Idle mod, Airbags, Marathon Seat Covers, LED lights.

2012 Eclipse Stellar 27DBLG

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