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Old 07-19-2013, 05:23 PM   #1
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Ford A/C question

I have a 2012 (2011 chassis) Ford class C and I notice that when I go up a hill under a load, the a/c blower will cut out for 10 seconds or so. Then it comes back as normal. It almost seems the blower is still going but an intake door closed or something. Not sure of that though... Turning off the a/c to vent does not affect this, nor does changing the blower speed. Anyone else have this happen, have an idea? It happened five times today, then not again for an hour.
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Old 07-19-2013, 05:49 PM   #2
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Sounds like the A/C system is loosing vacuum, either due to a bad check valve or a vacuum reservoir being to small.
When the engine is near full throttle there is no intake manifold vacuum to replenish the system, and most times with no vacuum the dash controls will default to defrost; then return to their settings when vacuum is restored.
Not sure where the check valve and reservoir are on your Ford, but the valve will be between the intake manifold and the reservoir in the vacuum line of course and it closes the line so vacuum wont bleed back to the motor at full throttle. The reservoir may be too small ( black plastic about the size of a soft ball ) I added another on my last tow vehicle for this reason. Cruise control on my P/U was using all the vacuum and starving the A/C.
Just re-read your post , I was assuming gas engine , the same problem is possible with a diesel , except there is a 12volt vacuum pump instead of engine vacuum , erratic operation of the 12v pump could cause these problems too.
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Old 07-19-2013, 06:09 PM   #3
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This system is does use vacuum as mentioned above. There is a check valve prior to the vacuum reservoir. Suspect a small leak in this system. If you are under 36000 miles, this should be covered under the Ford warranty. As long as the body builder did not mess with this system, it should be covered. The Econoline chassis are shipped from what I understand with the complete HVAC system built and working.

You should be able to duplicate this concern by performing a WOT acceleration. This may help the servicing dealer determine the fault also.
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Old 07-19-2013, 07:18 PM   #4
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Thanks!
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