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Unread 12-22-2013, 12:33 PM   #1
Kevinyj95
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1995 ZJ 
 
Join Date: Jun 2012
Location: Presque Isle, Maine
Posts: 756
No heat.... or very little

Barely any heat at all wont even defrost the window. Kinda sucks when you have to get out and scrape your window every two mins in the freezing rain.
00 4.7. new rad, water pump , fan clutch and thermostat 195*. It did this last year before the new parts as well. heat core has good flow flushed it twice. NO leaks no air. The heat is warm hot when its warmer like fall. Now that its winter were freezing again. blows air good just only slightly warm. Thanks for any help or tips. Im thinking heater core but it has good flow when I hook the hose to it and flush it.

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Unread 12-22-2013, 01:11 PM   #2
creepingdeath94
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2000 WJ 
 
Join Date: Sep 2010
Location: port saint lucie
Posts: 147
Maybe blend doors not making a good seal between heater core/evaporator side? If the foam internally has come apart it could just be inefficient for how cold it is.
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Unread 12-22-2013, 01:41 PM   #3
LowLyfe
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2002 WJ 
 
Join Date: Feb 2012
Location: Helena, Montana
Posts: 95
Both sides blowing cold air?
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Unread 12-22-2013, 03:04 PM   #4
Kevinyj95
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1995 ZJ 
 
Join Date: Jun 2012
Location: Presque Isle, Maine
Posts: 756
yes its the same everywhere.
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Unread 12-22-2013, 03:44 PM   #5
86cj74.2L
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2004 WJ 
 
Join Date: Jul 2006
Location: Stouchsburg, PA
Posts: 7,175
If you are not overheating and your engine temps are always normal its time to look at your heater controls.

You could loosen a clamp on the coolant lines going to the heater core and make sure coolant comes out.

Doing a few 3/4 throttle accelerations to 60 should push any air trapped in the heater core back into the block where it can get dumped into the rad.
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Unread 12-22-2013, 04:09 PM   #6
abock33
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2001 XJ Cherokee 
 
Join Date: Jun 2009
Location: Northern KY
Posts: 55
My heat was the same way until Friday. Bit the bullet and put a new heater core in it. I had good flow as well. When I pulled the old one it weighed three times as much as the new one. It turns out it was most of the way clogged but i couldn't tell cause the flow through the clear tubes was hiding the issue. It's nice to have heat. If you can set aside a day and replace it as we'll as your a/c evap core since your in there.
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