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Old 01-13-2014, 10:39 PM   #1
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Heating problem!

Eh guys,

Fellow Canadian jeeper here, I own a 1994 jeep Sahara yj. I'm in and out of arenas quite a bit for hockey and would love some hot air to warm me up, unfortunately it isn't working. Sometimes blows hot air and sometimes it's cold and sometimes it will tease me with like warm air, it's driving me crazy! Even after I get it to operating temps! I haven't torn anything apart or even tried to pin down the problem, I'm 19 years old working a full time job the last thing I want to do in the middle of the winter is tear it apart, it's got 230,000 kms on it and is in good shape I recently replaced the original gas filter on it... Got all my fluids changed (trans,front and rear diffs, trans case, engine oil.) I just did the rad in the summer because I got into a fender bender and blew the rad. I don't know where else to turn to, I know it's got to be the heating motor whether the lines are clogged and it's not receiving fluid but do I got to flush it or just better off to install a brand new one? Some input would be nice guys!

Happy jeeping!

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Old 01-13-2014, 10:46 PM   #2
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There is a sticky in the YJ tech forum that might help you figure it out

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Old 01-13-2014, 11:04 PM   #3
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That dis out things into perspective so going off my knowledge of the problem I'm going to say when I switch it into heating the arms aren't closing all the way allowing some fresh air to flow through
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Old 01-14-2014, 07:57 AM   #4
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flush your heater core,,,
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Old 01-14-2014, 03:44 PM   #5
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On the bottom passenger side of your cab is the arm that opens a little door on the heater vent. Sometimes that bracket will break off the rivets and be so loose that the cable has too much slack. When the cable has too much slack, it wont open the heater door all the way, and it causes cold air to come through like the vent is open to the outside.

It will drive you crazy with being cold sometimes and hot sometimes.
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Old 01-14-2014, 10:41 PM   #6
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Oh it does it's cold bam warms up back to like warm air and I spend sometimes an upward of 8 hours in the arena ( I know true Canadian eh?) but I would love some hot air to warm up too
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Old 01-15-2014, 08:28 AM   #7
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make sure the little door on the passengerside is closed, and flush your heater core.
most everytime the core just gets clogged and needs a good flushing,its easy and a heck of alot cheaper and easier than replacing your core..
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with trail rash..and getting 25mpg,s
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Old 01-15-2014, 12:53 PM   #8
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That is true, in the spring she's getting spoiled though welding in new floor pans, new paint job (I'm a certified colour finisher) 31's maybe even a lift cargo net the whole works! I just don't want to face this problem again next winter
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Old 01-15-2014, 06:32 PM   #9
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last year but i lost my heat after i replaced my water pump and t/stat..
i had given the whole system a good flush before and after but it would do just like yours sometimes warm sometimes cold , so i was looking up and getting ready to replace my heater core and thought why not just give the heater core another flush, this time i got some brown gunk come out then alot started coming out put my hoses back on and BAM hot air i have stayed pretty comfy in my little rag top yj all winter,,i havent even put my driverside window panel in,,,im from kentucky and i know we dont have the cold as you do , but 20deg. is cold here and im still warm.
i cant tell you how many people i have helped get there heat back with just a simple core flush i hope this works for you !!

i know we all look forward to watching your build this spring and see how and what you build yours for,,,,best of luck to you..
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Old 01-15-2014, 08:25 PM   #10
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Yea some days were -40 and some days -10 but cold is cold aha and oh ya I'll be doing a build thread showing step by step!

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