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Unread 05-25-2011, 06:56 PM   #1
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1994 YJ Wrangler 
Join Date: Jun 2009
Location: Ohio
Posts: 173
yj 4.2 Strange heater noise

Hey guys, I've got an 88 yj l6 4.2 auto. The heat gets nice and hot, always has since i've had it. Also, since i've had it, the when the heat is on i get a constant whining noise. Its kinda high pitched, and gets louder the higher i set the fan. If you can imagine... it sounds like someone going ehhhhhhhhhhhhhhhhhhhhhhhhhh, but obviously sounds mechanical.

Since i dont need my heat anymore for a while i figured i'd yank the fan or whatever i may need to do and get it fixed before summer's end. The noise is pretty loud and very annoying.

Thanks for any help.

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Unread 05-25-2011, 07:24 PM   #2
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1991 YJ Wrangler 
Join Date: Nov 2008
Location: Elizabethtown, Ky.
Posts: 3,064
Sounds like a bearing in the fan motor has gone out .


MJM Powder Coating
Elizabethtown Ky.

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Unread 05-25-2011, 07:34 PM   #3
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1990 YJ Wrangler 
Join Date: Aug 2006
Location: Grass Valley California
Posts: 14,442
X's 2 on the Fan motor, just be aware that the new motor will not fit the stock hole in the firewall so you'll have to enlarge the hole size a bit. The current Siemens part number for the YJ is PM102 which is the same number as the "Blazer Upgrade", just FYI.
Originally Posted by George Orwell
We sleep safe in our beds because rough men stand ready in the night to visit violence on those who would do us harm.
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4.2 , heater , noise , wrangler , YJ

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