Question about 1995 Ford Bronco

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1995 Ford Bronco - AC and heat cut out when under a load

I have a 95 Ford Bronco, 351, Eddie Bauer, and for the last few years the AC and heat cut out when you're gassing it or going up hill. The AC holds a charge and works fine so, I'm guessing that since it's doing the same with the heat, maybe some sort of vacum line or something like that?  Thanks in advance for your help.

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  • regger Jan 08, 2009

    Sorry...yes when I accelerate, it stops blowing. I don't think it comes out of the defrost vents, because I don't hear it, and it's hot as hell...haahaa.

  • moonracer666 Jan 24, 2009

    My 95 Bronco has done this too for the past couple years, but never before. This is why I don't think it's by design, I think it's a vacuum leak but am not sure either.

  • kevin carpenter May 11, 2010

    do you mean when you acclerate the air no longer blows out the vents and starts blowing out the defrost vents?


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I had the same problem on my 95 XLT 351. It was the vacuum tube going into the ac/heater box on the passenger side near the firewall. The tube was rotten.......I replaced it and BAM.....all fixed.

Big Tim
Jupiter, Florida

Posted on Dec 03, 2009

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This is by design, there is a WOT [wide open throttle] cut out that cuts your ac off to be certain you have full horsepower for passing.

Posted on Jan 08, 2009

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I just found this on another site ------

The doorsa in your heater case that control which vents the air blows out of are operated by engine vacuum on this model. The vacuum is supplied through a hose that passes from the heater control assembly out through the firewall to the intake manifold.
When youa ccelerate, it causes a sudden drop in engine vacuum. To prevent this sudden drop in vacuum level from affecting the operation of your heater/ ac system, there is a plastic one way check valve located somewhere in this hose out under the hood; this lets the engien draw on the hose but prevents loss of vacuum from the hose if engine vacuum drops too low.
Your problem is being caused either by a cracked/ leaking vacuum hose, or a faulty one way check valve in the hose. There is also a vacuum reservoir in the system to maintain engine vacuum during acceleration.
If you investigate the vacuum connections out under the hood, I am sure you will find the problem in that area.

It makes sense to me - moonracer666

Posted on Jan 24, 2009

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