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the vacuum hose connects to the airbox
A vacuum line near the gas tank on a 2003 Jeep Grand Cherokee is there to keep the tank from locking up due to an air pressure imbalance. If there is an imbalance of air pressure the tank will vapor lock and the engine will not get fuel.
yes it does but i do not know where it goes to, i have a 98 and my vacuum line came off and is still connnected to the tranny
It goes to the ac/heater control head.
vacuum leak at the master cylinder or vacuum line to the master cylinder
The transmission oil line from a 1991 model of a Jeep Cherokee will fit a 1988 model of a Jeep Cherokee because the transmission oil line fits all Cherokee models that were made between 1987 and 1996.
You have a vacuum leak somewhere. Check the orfice line.
fuel pressure regulator
It is self adjusting on a 89 Cherokee with a in line 6 4.0
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The mode door is vacuum controlled in the GC and the default fail position is defrost only. You most likely have either a vacuum leak or a broken vacuum line. There is a vacuum junction under the passenger side dash that kids like to kick and pull the vacuum line loose. That's the first place to check.