A/C quits working when engine is under load.


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


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.

12 of 12 people found this helpful.
Best Answer Mark helpful

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.

4 of 4 people found this helpful.

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 of 20 people found this helpful.

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