a/c switch to defrost at 60-70 mph, cruise control not working

1997 DODGE RAM
331 MILES
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TMAJ9447
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  • 78 POSTS
i have replaced all vac check valves, vac tested all a/c lines in cab including vac canister. i hear what sounds like a large vac leak when pressing the accelerator but can not track it down. new engine block approx 6K on it, sprayed around engine on change purs like a cat. i am at my whits end please help.
Dec 19, 2011 at 1:56 PM
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FIXITMR
  • ✓Experienced Mechanic
  • 9,989 POSTS
splice a vac gauge into line and watch what happens.
Dec 19, 2011 at 2:47 PM
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TMAJ9447
  • MEMBER
  • 78 POSTS
Where do you recommend a good location to splice in a vac gauge, before check valve at manifold, after check valve, or other location. Also what am I looking for??
Dec 19, 2011 at 3:52 PM
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FIXITMR
  • ✓Experienced Mechanic
  • 9,989 POSTS
splice into hvac line in cab pre controls.
Dec 19, 2011 at 5:28 PM
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