Auto Repair - Roadshow forum


97 Grand Cherokee Limited. Ticking sound

by frandy305 / January 11, 2015 4:44 AM PST

Hello all new to the forums here. Glad to be here and being part of the community. So I just bought a 97 grand Cherokee limited v8 and recently noticed a ticking sound coming from the engine. I found where the sound was coming from and its actually not the engine but a plastic part right next to the air filter box. I took a picture of it. You should see it down below. But any ways the car runs and sounds great I'm just curious what that part is for and should I get it replaced?

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All Answers

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by vembutech / January 12, 2015 4:50 AM PST
In reply to: image

just get the AC system serviced issue will be resolved

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that's a pressure control for the AC
by James Denison / January 11, 2015 5:37 AM PST

If it's clicking, then most likely it needs the refrigerant recharged or too much was placed in it. It could also mean the refrigerant line is blocked. There are usually two pressure controls. One turns the compressor off if the pressure on the condensor side goes too high. The other turns the compressor off if the pressure on the evaporator side goes too low, to keep out atmospheric gases being sucked into the system if there's a leak somewhere, introducing atmospheric moisture into the system. The clicking sound can be caused by either of those acting on the compressor's electromagnetic coil turning on and off, causing the pressure plate on the center shaft of the AC to run the compressor or turn it off. When the pressure plate hits it can make such a click noise. This sounds like an AC problem.

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