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f350 repair

Sent to Car Experts July 11, 2005 2:02 p.m.

ford f350 on heatin/air conditioning dials on dash only setings that work are defrost and floor when turned to ac it goes to defog vents and so does vent settings. what could cause this it worked a few hours before with no problems then all the sudden it stopped.

Customer (name blocked for privacy)

Status: Closed Value: $25

Answer
July 11, 2005 7:17 p.m. (5 hours and 15 minutes later)

REPLIED

That is vacuum controlled and you have a problem with vacuum. I'm betting this is only happening when the A/C is set to Max A/c. Ford has a common problem with the vacuum line rotting away for the recirculation door which is only operational in Max A/C. Look under the hood, on the passenger side and you will see a vacuum diaphram over there on top of the A/C box. Look at the hose and follow it back to the harness. I suspect you will find it rotted away. Just splice in a piece of vacuum hose that size.

Hammer Time -- L1 Master Technician -- 98% Positive Feedback on 2706 Car Accepts
ASE Mastertech with Adv level Engine performance cert.

Answer
July 11, 2005 7:20 p.m. (3 minutes and 49 seconds later)

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Hammer Time -- L1 Master Technician -- 98% Positive Feedback on 2706 Car Accepts
ASE Mastertech with Adv level Engine performance cert.

Reply to Hammer Time
Sent July 11, 2005 8:21 p.m. (1 hour and 0 minutes later)

max ac, ac and vent do not work vacum what vacum lines do i need to follow or to replace to make work

Customer (name blocked for privacy)

Answer
July 11, 2005 8:38 p.m. (17 minutes and 1 second later)

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Hammer Time -- L1 Master Technician -- 98% Positive Feedback on 2706 Car Accepts
ASE Mastertech with Adv level Engine performance cert.

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