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Old October 27th, 2013, 03:30 PM   #1
skife
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97 XJ, weak heat

heater on my G/Fs XJ blows luke warm... moving the blend door it will get cold and then back to luke warm, I flushed the heatercore with water until it was pouring out clear, and it seemed to help slightly.

G/f isn't happy she is cold, help please.
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Old October 27th, 2013, 03:32 PM   #2
Mudking
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Mine is that way to. On high heat its hardly warm. On low its warmer

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Old October 27th, 2013, 03:48 PM   #3
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Either clogged heater core or bad thermostat.
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Old October 27th, 2013, 04:28 PM   #4
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Plugged heater core
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Old October 27th, 2013, 07:01 PM   #5
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going to flush it with acid tomorrow
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Old October 27th, 2013, 08:07 PM   #6
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Flush it both ways. I hooked hoses end to my lines n threaded the house on so it got max pressure
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Old October 27th, 2013, 08:38 PM   #7
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Don't leave the acid in too long. I flushed one at the dealer once and left it in a tad too long and it ate through the core. And if anybody knows how hard it is to replace a core on an S series Blazer, it wasn't worth it.
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Old October 27th, 2013, 10:16 PM   #8
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Where do you get the acid? Battery acid?
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Old October 27th, 2013, 10:20 PM   #9
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Carquest sells a radiator flush which I think is hydrochloric acid. Or something similar.

I would use a long transmission funnel which fits well into the hose end. But the acid will soften the plastic.
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Old October 28th, 2013, 03:41 PM   #10
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Try burping the system. I did all the stuff you did and still only put out luke warm air. After burping the system, getting all the air out, it start to push the heat out.
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Old October 28th, 2013, 05:08 PM   #11
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Quote:
Originally Posted by mudviper View Post
Try burping the system. I did all the stuff you did and still only put out luke warm air. After burping the system, getting all the air out, it start to push the heat out.
trying to flush the core with vinegar right now.
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Old October 28th, 2013, 06:51 PM   #12
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slightly better, going to put a thermostat in it tomorrow.
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Old October 28th, 2013, 08:44 PM   #13
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Quote:
Originally Posted by skife View Post
slightly better, going to put a thermostat in it tomorrow.
Ours (my wife's dd also) runs just under 210 all the time. So didn't imagine a tstat helping. I'm gonna try the same this weekend. Flushing and burbing

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Old October 28th, 2013, 09:09 PM   #14
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You can check the temps of the hoses to see if the coolant is flowing, check at different spots like at the upper radiator and lower and the heater hoses. An infrared or laser thermometer is easiest but contact thermometers can work too.

This can tell you if the thermostat is not opening or if the heater core is clogged.
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Old October 29th, 2013, 06:44 AM   #15
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Upper rad hose was warm when temp gauge said 205, heater hose that's up there is just warm too.
coolant is brown and nasty. This weekend itll get wheel bearings and a coolant flush
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Old November 4th, 2013, 05:31 AM   #16
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Coolant flush didn't help much.
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Old November 4th, 2013, 11:53 AM   #17
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time for a heater core. Fun stuff. weekend repair if you DIY
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Old November 4th, 2013, 07:15 PM   #18
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Check the diverter valve by the firewall
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