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Unread 02-25-2013, 07:44 AM   #1
jwrangler91
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cooling issue

I have a 97 Cherokee... 182,000 miles. I am having a bit of an issue with my cooling system.

#1 - My heat is nowhere near as warm as it was a couple of weeks ago. Sometimes it blows cold air, sometimes hot, but typically just unsatisfying warm air.

#2 - When i am moving, my temp is fine (right around 200). If i stop, or get caught in traffic, the temp rises to about 230 degrees, which i am not comfortable with.

I'm thinking a good flush will do it for me. Hopefully that is why the heater core is acting up. Im fine if i have to replace the radiator, but really dont feel like replacing the heater core.

Any ideas?

Thanks

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Unread 02-25-2013, 08:28 AM   #2
xjfever
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Your heater core could be partailly clogged, be sure to remove the hoses and give it a good flush as well. The fan clutch is suspect when temp creeps at idle or in stop and go traffic. Also be sure the fins are open and there are no debris clogging the airflow through the radiator and that your electric fan is operating correctly.
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Unread 02-25-2013, 09:06 AM   #3
jwrangler91
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If I flush the entire system using a garden hose, will that unclog the heater core?? I was thinking the same thing about the fan clutch as well.
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Unread 02-25-2013, 10:08 AM   #4
VBRubicon
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Just pull both 5/8"(I think) lines off either at the proportioning valve or the firewall and flush it there. At that point, i'd swap the hoses too if they wern't new. And make sure that valve is moving when you change from hot/cold.

Just saw that you said this is a '97 and probably a totally different set-up on the heater valve....ha!
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Unread 02-25-2013, 05:55 PM   #5
xjfever
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There is no heater control valve on the 97 model. I would flush the core directly though, and make sure it is flowing properly.
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  2. Sold'99 WJ limited, 4.7L, 3" IRO lift. Bilstein shocks, JK rubicon wheels, 255/70/17's, carolina driveshaft, IRO adjustable control arms, IRO adjustable A-arm
  3. Sold '00 TJ, 4" lift, rusty's adjustable control arms, skyjacker shocks, rock krawler adj. trac-bar,rugged ridge SYE and RE driveshaft, soft 8's, 35" mud king xt's,XJ HP D30 w/aussie locker, 4:88 yukon gears, hella 500's, rock crusher diff covers
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Unread 02-25-2013, 06:41 PM   #6
Flyordie
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Quote:
Originally Posted by xjfever View Post
There is no heater control valve on the 97 model. I would flush the core directly though, and make sure it is flowing properly.

REVERSE FLUSH! Fill the core with 50/50 Vinegar Water also to eat up any calcium and deposits that have formed. You could do the same with the radiator if you like too.
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Unread 02-26-2013, 02:26 AM   #7
oakmckinley
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Thems hoses ain't cheap.

I dropped $200 bucks on all new hoses for my XJ this past fall. But if you need them...what can you do.
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Unread 02-26-2013, 06:03 AM   #8
jwrangler91
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Do i have to flush the radiator and the hoses to the heater core seperately?
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Unread 02-27-2013, 01:06 AM   #9
oakmckinley
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Just do the heater core. You can use water, not necessarily vinegar or anything else.
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Unread 02-27-2013, 09:49 AM   #10
jwrangler91
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Ok... well i'm going to flush everything seperately best I can. If that doesn't work I'm thinking it might be the fan clutch...
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Unread 02-27-2013, 01:02 PM   #11
oakmckinley
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For what it's worth, I know the fan clutch gets mentioned a lot on here but mine are fine on both my Jeeps.

You plugged heater core is probably causing the slight overheating.
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