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Discussion Starter · #1 ·
My 89 yj 4.2L has never really put out substantial amounts of heat. Didn't know if it just wasn't built for much heat or some other reason
 

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some other reason. it should run you out.
 

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Does your cooling system seem healthy? Sometimes if you've been using a weak antifreeze mix (it also contains essential lubricants and rust prevention agents) rust particles can gum up the heater core.

I'd imagine stop-leak preventatives and similar agents could also reduce the efficiency of your heater.

Hope you find a solution - extreme cold right around the corner!
 

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Discussion Starter · #4 ·
I might try flushing the heater core on Sunday. But coolant is fine and radiator was replaced befor it was parked prior to my purchase of the vehicle
 
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