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Unread 02-10-2010, 12:03 AM   #1
tehmilz
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2000 XJ Cherokee 
 
Join Date: Feb 2010
Location: springfield mo
Posts: 11
heat wont get hot just gets warm

the heat in my 2000 cherokee sport with the 4.0 will only get warm. the temp goes to 195 but the heat doesnt get hot any ideas?

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Unread 02-10-2010, 12:17 AM   #2
jettatdi
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1973 FSJ Cherokee 
 
Join Date: Feb 2009
Location: Atlanta, Georgia
Posts: 102
I have the same problem with my 97 Cherokee. Let me know if you find a solution.
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Unread 02-10-2010, 04:28 AM   #3
tjwalker
It's the crank sensor!
 
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1999 XJ Cherokee 
 
Join Date: Nov 2007
Location: Central Minnesota, MN
Posts: 8,467
By far, the most common cause of weak heat into the cab if coolant temp is at a reasonable temperature, is a partially clogged heater core.

Running near 200 means that your thermostat is working okay and there is no heater control valve on a 2000.

Verify blend door operation, but suspect the heater core if that checks out.

They sometimes can be backflushed with a garden hose to restore function but if that doesn't work, it would need to be replaced.

Feel both the hoses going to the heater core when the engine is hot. If one is hot and the other not so much, that is proof of a heater core problem. That technique though is not completely foolproof for a partially clogged core.
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Unread 02-10-2010, 05:22 AM   #4
superj
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1987 YJ Wrangler 
 
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Location: corpus christi, texas
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until you get it fixed, buy one of those electric heaters that plug into your lighter. they sell them at truck stops by the CBs.
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Unread 02-10-2010, 03:04 PM   #5
dirty97jeep
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1997 XJ Cherokee 
 
Join Date: Dec 2009
Location: Lovettsville, Virginia
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try disconnecting both hoses from the heater core and and if possible hook a hose up to one end and increase water pressure slowly and you should se some gunk and whatnot coming out of the other end.
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Unread 02-10-2010, 07:31 PM   #6
tehmilz
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2000 XJ Cherokee 
 
Join Date: Feb 2010
Location: springfield mo
Posts: 11
i did that to my whole cooling system today dirty97jeep. now the heat gets nice and toasty! thanks guys
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Unread 02-10-2010, 07:41 PM   #7
Smittyman
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2000 XJ Cherokee 
 
Join Date: Aug 2009
Location: Knoxville
Posts: 500
Haha, exact same thing happened to me. Works like a charm! Glad you got it taken care of
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