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Author Topic: Dashboard vac.lines  (Read 985 times)

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Offline Sandeagle

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Dashboard vac.lines
« on: September 13, 2015, 09:02:15 AM »
Before I start digging  what vac lines are behind the dash. I hear a leak at idle,during acceleration it cuts down but at cruising  speed it comes back. I have cruise control  but haven't tried yet.  Just got her yesterday.. Am not sure if 4wd is engaging  either.

Offline txjeeptx

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Re: Dashboard vac.lines
« Reply #1 on: September 13, 2015, 01:54:42 PM »
There are vacuum lines going to and from the 4wd switch on the dash, and some of the heater/defroster controls use vacuum. Those are places to start looking for disconnected or rotten lines for a vacuum leak inside the car.
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Offline Sandeagle

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Re: Dashboard vac.lines
« Reply #2 on: September 13, 2015, 03:23:48 PM »
Anything for cruise control

Offline txjeeptx

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Re: Dashboard vac.lines
« Reply #3 on: September 13, 2015, 04:40:27 PM »
The only vac line for the cruise stays in the engine compartment. Cruise control, whether factory or added on, only has wiring inside the cabin.
'82 Eagle SX/4 "Golden Eagle", '89 YJ 2.5L '93 MPI-converted rock-crawler, '79 Jeep Cherokee Golden Eagle "FSJ", 'o7 F150 Supercrew FX/4 daily driver

Online AMC of Houston

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Re: Dashboard vac.lines
« Reply #4 on: September 13, 2015, 04:45:19 PM »
Well, except for that silly cruise vacuum bleed-off switch on the brake pedal.  But it only has vac to it while the cruise is engaged.
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Offline carnuck

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Re: Dashboard vac.lines
« Reply #5 on: September 14, 2015, 12:56:00 AM »
Unless it's hooked up wrong. Bad brake booster will do that too.
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Offline Sandeagle

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Re: Dashboard vac.lines
« Reply #6 on: September 19, 2015, 09:41:07 PM »
Once I noticed when she was parked for 4hours the brake pedal was solid the first time I stepped on it and I haven't stepped on it at all when it was parked. She is running great since I found and pluged the leaks I could find. A manifold vac line was off. I could hear the leak inside the car from under the hood. That was the reason for the post,it sounded like it was behind the dash.

 

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