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Old 01-06-2014, 12:00 AM
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schwag27's Avatar
Join Date: Aug 2012
Location: niles, just north of chicago
Posts: 350
88 YJ heat question

so its been really really cold in chicago this winter - gonna be -15 tomorrow!

my heat barely gets warm after about 40 minutes. my question is did YJs run heat simply from the engine blocks and its just so cold that its doesn't get warm enough? or do they have a heating core/element that is not working right?

thanks for any input!

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Old 01-06-2014, 03:47 AM   #2
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Location: Ohio
Posts: 316
When everything is working correctly the YJ's have a pretty good heater. You must have some other issues. Check the blend door movement, make sure the blower fan is working , then if need be try flushing the heater core. That can be done with a garden hose. Disconnect the heater hoses from the engine and insert the garden hose in to one of them. If it starts to flow well then great. If not then try flushing through the other hose. If you get good flow that should fix your problem. If you cant get it to flow then its time for a new heater core.

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Old 01-18-2014, 06:01 PM   #3
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Location: Henryville, IN
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I flushed mine before this winter. Made a huge difference. Basically had no heat before, now, it's pretty comfortable.
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Old 01-18-2014, 09:07 PM   #4
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If I put the heater on high it gets too hot. If the flush doesn't solve the problem you most likely have a clogged heater core. If it fails you'll get a puddle of coolant on the passenger side floor board.
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Old 01-22-2014, 05:25 PM   #5
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Mine gets warm but definitly not hot, maybe i'll try flushing it. Good info.
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Old 01-23-2014, 05:06 PM   #6
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i'm having a heat issue as well. had a coolant leak fixed issues. today my jeep didn't get above about 150. i know it normaly loves to be about 210. i'm wondering if just too cold for some reason. never been a big fan of blocking off grill some but may have to.

Schwag27 where is you jeeps temp at?
95 YJ, 4" suspension lift, 32's, 2.5l 4 cyl (350 built and waiting to be installed in spring, along with ford 8.8 rear end)
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Old 01-24-2014, 09:24 AM
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Location: niles, just north of chicago
Posts: 350
real low - barely moving on temp gauge after 30 min - but in chicago we're having wind chills of -10 to -20 so its pretty damn cold

i already picked up a new heater core. waiting for a warm enough day to install
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Old 01-24-2014, 10:18 AM   #8
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Posts: 61
maybe something like this could help you out until spring.....

Jeep CJ CJ5 CJ7 YJ TJ Wrangler 12V Backseat Heater 13150 01 | eBay

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