Help: Heater squeal

smtippin · 10-08-2009, 10:40 AM

Need your help all. Temps have dropped to below freezing temps here in Wyo and my heater/AC is squealing. The air seems to be blowing fine and according to settings (ac or heat), but there is a quiet high pitched whirl and/or loud squeal for various durations randomly while driving. The sound will be intermittant for maybe 5 minutes before it stops and the heat works fine. It just happens at every start up. What gives?

PS. This all started abruptly after letting the Jeep sit for approx. 2 week when out of town. Sounds seem to be coming from behind the glove box, where I believe I saw the blower motor previously.

Gimme your thoughts. If my blower is about to explode, I'd like to have another ready so I don't have to drive without heat/defrost for a while.

Thanks again,
s

Abovetimberline · 10-08-2009, 10:51 AM

It is possible something has crawled in there and set up home when it got cold. Try and pull it and see if anything is in there.
My heater core also made this noise when it had air in the system.

smtippin · 10-08-2009, 03:13 PM

pull what? The blower behind the glove box? How do I check for 'air in the system'?.

Thanks,
s

mike albo · 10-08-2009, 03:20 PM

Sounds like a bearing is makeing a little noise in the fan, it should be fine unless you can't handle the squeal.

aircrewallan · 10-08-2009, 03:52 PM

ya mine does something to that effect...when i get the heat turned on outside the car sounds like its surging, like the compressor is loading up then unloading and i have a minor squeal during the "load" cycle and it causes my headlights to dim every 5 secs or so < not sure if its the same for you or what the deal is with mine...

UK PONY · 10-08-2009, 06:59 PM

Mine does the same thing...I have a used blower motor set aside just in case (pretty sure it's the blower motor bearing) but for now I've found that if I turn up the blower speed the squeal goes away much quicker..then just turn the blower speed down to whatever you need it to be.

lhickey · 10-11-2009, 12:53 PM

Trying to figure out how to get to the blower in my 2002 Jeep Grand Cherokee. A mouse - now dead and getting smelly - took up residence.

speedyp · 12-11-2009, 09:50 AM

I have the exact same issue, I came here to find an answer. Hopefully someone will have a cure for this !

I second the following it does work pretty good :

Quote:

Originally Posted by UK PONY

Mine does the same thing...I have a used blower motor set aside just in case (pretty sure it's the blower motor bearing) but for now I've found that if I turn up the blower speed the squeal goes away much quicker..then just turn the blower speed down to whatever you need it to be.

10-08-2009, 10:51 AM	#2
Abovetimberline CF Veteran Garage is empty, add now Join Date: Jul 2009 Location: Chico,ca Posts: 2,159 My Photos 89 Cherokee Engine: 4.0 Transmission: AW4 Transfer Case: 242 Front Axle: D30 Rear Axle: D44 Tires: Junk at this point	It is possible something has crawled in there and set up home when it got cold. Try and pull it and see if anything is in there. My heater core also made this noise when it had air in the system. __________________ Marry the right person it will determine 95 percent of your happiness or misery. Remember that old saying,you can be right or you can be happy,I choose happy. 89 xj in progress D44,4"x 2" lift 72 Restored chevy truck 4x4,lockers,built 350,approx 400 hp.

10-08-2009, 03:20 PM	#4
mike albo CF Veteran Garage is empty, add now Join Date: Mar 2009 Location: Loomis,California Posts: 8,687 My Photos 1987 Cherokee Engine: 242 inline six Transmission: aw4 automatic Transfer Case: np231 Front Axle: hp D30 Rear Axle: D44 Tires: michellin ltx ms 235-75-15 Lift Specifications: OME 2 inch standered duty Misc Accessories: JKS track bar, lower&upper arms, disconects, stainless steele brake lines, KC lights, more to come	Sounds like a bearing is makeing a little noise in the fan, it should be fine unless you can't handle the squeal. __________________ You can't fix stupid!

10-08-2009, 03:52 PM	#5
aircrewallan Seasoned Member Garage is empty, add now Join Date: Sep 2008 Location: WA Posts: 313 My Photos 1999 Cherokee Engine: 4.0L I6 Transmission: Auto Transfer Case: NP231 Front Axle: D30 Rear Axle: Chryso 8.25 Tires: 33x12.5 SS TSL on 15x10 RockCrawler's Lift Specifications: 3.5'' RE SuperRide w/ Full Leafs	ya mine does something to that effect...when i get the heat turned on outside the car sounds like its surging, like the compressor is loading up then unloading and i have a minor squeal during the "load" cycle and it causes my headlights to dim every 5 secs or so < not sure if its the same for you or what the deal is with mine... __________________ WHEN THE RICH WAGE WAR, IT'S THE POOR WHO DIE! __________ /__l__l,\____\, l---L---L –XlllllllX ()_)----()_)--o-)_) http://www.whidbey4x4.com "It's an XJ thing, you wouldn't understand"

10-08-2009, 06:59 PM	#6
UK PONY Junior Member Garage is empty, add now Join Date: Sep 2009 Location: Saskatoon, SK Posts: 86 My Photos 1988 Cherokee Engine: 4.0L Transmission: Auto Transfer Case: NPG 242	Mine does the same thing...I have a used blower motor set aside just in case (pretty sure it's the blower motor bearing) but for now I've found that if I turn up the blower speed the squeal goes away much quicker..then just turn the blower speed down to whatever you need it to be. __________________ Steve 1988 Cherokee Limited, 4.0L, Auto 2005 Mustang Convertible 2007 Mustang Coupe

10-11-2009, 12:53 PM	#7
lhickey Newbie Garage is empty, add now Join Date: Oct 2009 Posts: 1 My Photos Cherokee	So where is the heater blower? Trying to figure out how to get to the blower in my 2002 Jeep Grand Cherokee. A mouse - now dead and getting smelly - took up residence.

10-08-2009, 03:13 PM	#3
smtippin Senior Member Garage is empty, add now Join Date: Oct 2008 Location: Wyo Posts: 996 My Photos 1996 Cherokee Transmission: AX-15	pull what? The blower behind the glove box? How do I check for 'air in the system'?. Thanks, s

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12-11-2009, 09:50 AM