Serpentine belt chirping when AC is on - Ford F150 Forum - Community of Ford Truck Fans



Serpentine belt chirping when AC is on

Reply
 
 
 
Thread Tools Search this Thread
Old 03-08-2015, 02:11 PM   #1
Member
Thread Starter
 
Join Date: Jan 2012
Location: Florida
Posts: 44
Thanks: 0
Thanked 1 Time in 1 Post
Default Serpentine belt chirping when AC is on

So my AC compressor is emitting a chirp-chirp sound when the AC is on (but is quiet when it's off), and I'm not sure whether it's the belt, the AC clutch, or a bearing. AC compressor and clutch are both under 2 years old (replaced with Motorcraft unit) and serpentine belt is just over a year old, replaced with a Motorcraft belt.

The chirp itself will come and go, when I switch the AC on, it'll be there about 50% of the time. If it does chirp, it will go away about half the time if I cycle the AC off and on. Same with driving, if it starts up I cycle the AC power and it'll go away. It doesn't seem to be effected by engine RPM.

The belt appears to be in good shape, no cracks or delamination. The idler rollers all turn freely, and the tensioner roller turns freely too. The tensioner seems likes it's putting the right amount of pressure on the belt, the belt deflects a little an 1/8 of an inch when pressed hard. I did the soap test on the belt and it didn't change when the sound happens.

The AC blows cold air constantly when on, which from my understanding, if it was the clutch itself it would be cycle between cold and ambient temp air. The clutch flywheel itself is hard to turn when the belt is not tensioned. the wheel does turn when the belt is moving.

I'm stuck with diagnosing the cause of the noise. I'm not sure which parts to throw at it first. Any ideas?
LutzNutz is offline   Reply With Quote
Old 03-08-2015, 07:49 PM   #2
Senior Member
 
jake_85's Avatar
 
Join Date: Jan 2015
Posts: 267
Thanked 17 Times in 16 Posts
Default

I had a intermittent chirp, good year gatorback fixed it!!
jake_85 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Larry's List Éire150 1987 - 1996 F150 20 06-07-2016 05:39 AM
Squeal 2 seconds at startup 89 F150 5.8l WolfgangFox 1987 - 1996 F150 19 10-23-2015 02:35 PM
New seats for my 2001 XLT SCAB? frank_a 1997 - 2003 Ford F150 4 10-02-2015 11:39 AM
2006 f150 chime dmandip 2004 - 2008 Ford F150 2 10-01-2015 06:50 AM
Brakes make sound only when pressed hard tlw613sp 2004 - 2008 Ford F150 5 09-29-2015 08:36 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 06:00 AM.


Copyright © 2006 - 2016 F150Forum.com