Vacuum leak or bad vacuum
11-06-2013, 12:51 AM
#1
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Year: 1997
Model: Cherokee
Engine: 4.0
Vacuum leak or bad vacuum
So here's the issue my heater is hit or miss sometimes hot sometimes kinda hot. Running at highway speeds I lose vacuum. I.e. My blend door shuts. I have not replaced all my lines but I cannot hear a leak. Also I do have a reservoir ball. Just put it in. When I did that I noticed the vacuum was much weaker than on other lines. Is this normal. Or is it a bad pump. I'm confused.
11-06-2013, 06:09 AM
#2
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
There is no vacuum pump. The vacuum source is the intake manifold. I would inspect the line carefully from the intake manifold to the reservoir.
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