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Unread 01-19-2013, 08:37 AM   #1
ckarmis
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1998 TJ Wrangler 
 
Join Date: Jan 2009
Location: CA
Posts: 19
How to flush heater core during radiator change

Can anyone answer the following questions:

1. Exactly how do you flush the heater core while changing out the radiator and thermostat. I've seen a few different posts but not sure which hoses to run the water hose through. Particuarly when I have the radiator disconnected and the thermostat removed. Any pictures to clarify would be helpful.

2. If I replaced the origainal radiator with a new mopar one, should I be using zerex G-05 or just the regular green stuff? I've also seen a few conflicing posts.

3. My current radiator cap is rated at 20#, but everythhing I read online says it should be 18#, so I'm replacing with an 18# one. Doest that sound right?

Thanks.

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Unread 01-19-2013, 10:09 AM   #2
ckarmis
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Join Date: Jan 2009
Location: CA
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For a 98 TJ

Also, to clarify point #2, I have a 98 TJ 6cyl. So I think the manuf recommendations call for the green stuff, but people recommend the zerex. Although I'm not sure if that's only for newer models, or applies to a 98 as well. All that said, I"m replacing the radiator with a new mopar one.
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Unread 01-19-2013, 10:48 AM   #3
Sandhara
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just run the green stuff, it works just fine.
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Unread 01-19-2013, 11:16 AM   #4
oakmckinley
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The thinner black hoses go to the heater core. Remove the hoses from thermo housing and other, and then flush water in one side, and then switch and flush into the other side (have the hose on pretty high, yes you'll get sprayed).
You should be good flushing both ways. I don't recommend putting anything in there, CLR etc. just use water.

If you are getting a radiator from mopar, ask them, if you not sure what coolant to use. I got my radiator from the dealer too, and was able to haggle on the price. It is much better one than after an market, IMO.
Good luck.
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Unread 01-19-2013, 11:58 AM   #5
LastDetail
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Good write up right here with some good pictures.
Helped me to do it right the first time and I'm a moron.

http://www.jeepforum.com/forum/f9/he...hotos-1266369/
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Unread 01-19-2013, 10:31 PM   #6
ckarmis
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Join Date: Jan 2009
Location: CA
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Mission Accomplished

Thanks for the feedback. Mission accomplished. Only snag was wermopar.com sent me the wrong lower radiator hose. But the old one was in good shape so I cleaned it up and put it back on.
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