Air compressor noise from behind the dash
Thread Starter
|
Senior Member
Joined: Dec 2016
Posts: 165
Likes: 37
From: Tulare/South Lake Tahoe
Air compressor noise from behind the dash
I’ve had my 98 XJR for 2 years now. Never heard this noise til last night. Sounds like a small air compressor behind the dash that comes on intermittently even when the car is off. Any ideas?
Veteran Member
Joined: May 2012
Posts: 3,290
Likes: 1,328
From: Winchester, CA
Probably the aspirator fan in the dash for the climate control sensors. The fans get noisy from dirt build up. If you look closely you can see a small pattern of perforations near the steering column. That is the fan inlet area. I have had pretty good luck sticking a shop vac over the perforations and removing the dirt to quieten the fan.
It comes on when the door is opened and will run a short while after you exit the vehicle.
It comes on when the door is opened and will run a short while after you exit the vehicle.
Veteran Member
Joined: Mar 2015
Posts: 3,125
Likes: 1,279
Try this test...
Next time you run the engine, make sure that the A/C button is off and do not use your defrost for this test. Run the engine 1 minute with climate control on and make sure the auto button is in the off mode. Turn the engine off and listen for this noise your hearing. If you do not hear the noise, start the engine again and turn the A/C on and run it for 1 minute. If the noise your hearing behind the dashboard is present after you turn the engine off, it’s most likely that your Freon is low in the system. Getting the Freon topped off will remedy the noise. It has something to do with low Freon level and the expansion valve that’s located in the dashboard.
Next time you run the engine, make sure that the A/C button is off and do not use your defrost for this test. Run the engine 1 minute with climate control on and make sure the auto button is in the off mode. Turn the engine off and listen for this noise your hearing. If you do not hear the noise, start the engine again and turn the A/C on and run it for 1 minute. If the noise your hearing behind the dashboard is present after you turn the engine off, it’s most likely that your Freon is low in the system. Getting the Freon topped off will remedy the noise. It has something to do with low Freon level and the expansion valve that’s located in the dashboard.
Last edited by Addicted2boost; Nov 11, 2018 at 12:24 PM.
Thread Starter
|
Senior Member
Joined: Dec 2016
Posts: 165
Likes: 37
From: Tulare/South Lake Tahoe
Freon level is good. Assuming since going through the ash/smoke of the fires here that highhorse is probably right. Seems like this little motor runs quite a bit even while driving. Hope it’s not going out
Thread Starter
|
Senior Member
Joined: Dec 2016
Posts: 165
Likes: 37
From: Tulare/South Lake Tahoe
So figured it out. I wasn’t even close. A few months ago the tracks on my sunroof crumbled to pieces. It’s locked into the vent position just slightly open. No worries I’ve preserved a replacement from a salvage car. Anyway for some unknown reason the motor for the roof started running. Got home pulled the upper console and sure enough that’s what it was. Unplugged it now no problem.
Thread
Thread Starter
Forum
Replies
Last Post
afterburner1
XJS ( X27 )
7
Feb 12, 2015 09:41 PM
MLRocafella85
XJ XJ6 / XJR6 ( X300 )
2
Dec 10, 2010 09:23 AM
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)