A/C quits working when engine is under load.

30

Asked by Jul 23, 2013 at 03:19 PM about the 2000 Ford E-150 STD Econoline

Question type: Maintenance & Repair

When accelerating, my A/C stops blowing and only sometimes resumes blowing when a fairly low speed is attained. At highway speeds, it practically never runs. One mechanic said it was a vacuum problem and the dash board would have to be removed to fix it ($900). Is there an easier way to get access to the problem?

3 Answers

88,905

He may be correct about a vacuum problem, when it happens does all of the air blowing go to the windshield like the defrosters are on? If it does then he correct about a vacuum leak and the dash will have to come out to locate it, it it doesn't do that then it could be a control head problem, but there again it is located behind the dash, kind of a catch 22. I would check the main vacuum line that feeds the heater controls first just to make sure it is not damaged somewhere along it's length.

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Best Answer
30

Thanks...that pretty much confirms my suspicions. I think it probably a fairly easy repair once you get to it, but the problem is getting to it.

3 out of 3 people think this is helpful.
23,405

There's a black plastic vacuum tube from the intake that runs along the top of the engine on the right side. There is a Check Valve a Tee, and a vacuum reservoir. One end of the tee goes to the reservoir and the other through a grommet through the firewall to your AC controls. The system is designed to hold vacuum whenever there is a high load demand (Climbing a hill, passing or taking off from a stop with a heavy load.) Check your tubing, check valve operation and the reservoir's ability to hold vacuum. $900? That's a lot of beer.

20 out of 20 people think this is helpful.

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