i have a 2003 ford e350 superduty. A/C blows cold in front and rear. Recently on family trip, the rear a/c blew hot air when the van was going up hill or when passing other vehicle and load on the engine is high. Front A/c not affected when going up hill or passing other cars, only rear a/c. I looked up online and saw it may be the vacuum reservoir. When i turn the van off i hear hissing behind the dashboard on passenger side. Would I be correct in just changing the vacuum reservoir first to see if it fixes the problem? others online say that it may be low freeon. should i try checking the free on first or just change the vacuum reservoir. thank you.
What makes this problem better or worse?
slowing down
How long has your 2003 Ford E-350 Super Duty had this problem?
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Hello, it sounds like air flow is being affected perhaps by engine vacuum. I'm not sure it's the reservoir as much as there could be vacuum leak or a fault with a vacuum operated motor this is causing this. Hands-on testing to trace the system off component function is needed.
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