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79 Cougar vaccum problem?

Tiny
SKETCHBAL1
  • MEMBER
  • 1979 ALL OTHER MAKES ALL OTHER MODELS
When I accelerate my a/c or heater stops blowing and makes a high pitch squeeky noise. When I go at constant speed or take my foot off the gas it starts to blow again. Any ideas?
Friday, January 12th, 2007 AT 10:50 PM

6 Replies

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
I not only have the answer, but it's on the house! Just give me a vote so I can see if thier counter works! I have answered a lot of questions for free. Tried to join as a moderator and have heard nothing from anyone. Back to you problem, You have a vacuum cannister mounted on the firewall, or near it with 1 vacuum line going to it, this is a reserve tank so when you accelerate the vacuum is supplied to the A/C system. If it develops even a pinhole it will not hold vacuum! Change this tank and all should be well! The old steel coffee can types are the worst of em!
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Monday, March 5th, 2007 AT 2:19 PM
Tiny
SKETCHBAL1
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There are two such canisters that I know of, one inside the engine compartment, and one inside the fender. Which one am I looking at replacing? What would you recomend I replace it with?
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Tuesday, March 27th, 2007 AT 2:32 AM
Tiny
MERLIN2021
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You want to replace the one that has a single black vacuum hose. Go to the junk yard and get a plastic one from a newer car.
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Tuesday, March 27th, 2007 AT 2:34 AM
Tiny
SKETCHBAL1
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They both have a single black vaccuum hose, the one in the engine compartment is more the size of a soup can, in the fender the size of a coffee can. What type of cars have u seen the plastic canisters in?
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Tuesday, March 27th, 2007 AT 2:38 AM
Tiny
MERLIN2021
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Well you should probably get 2 plastic ones! But the coffee can is the one with the leak. Most cars in junkyards today have round plastic balls that replace the old rust prone coffee can types.
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Tuesday, March 27th, 2007 AT 1:50 PM
Tiny
SKETCHBAL1
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Thanks! I'd give you another vote but it wont let me.
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Tuesday, March 27th, 2007 AT 8:25 PM

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