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Old 01-09-2011, 11:14 AM   #1
Krull's Avatar
Join Date: Jan 2011
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TJ heater question

My heater is acting funny.... when I am at higher rpms the heater blows very hot.. when at an idle it blows cold air no matter what temp the engine is at.. works fine when driving unless i sit for a while then back to cold air. I think maybe i need to flush the heater core, however the coolant is a little low.. not much though.i dont know what coolant i should add?, it has the factory coolant still in it tests out fine so i dont want to drain and replace the whole coolant system.. obvioulsy i would like to add coolant before i flush the heater core to make sure its just not a little low on coolant....what coolant comes stock in the 01 sport? what coolant could i add to it?
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Old 01-09-2011, 11:45 AM   #2
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Does your temp gauge read a good temp when you are driving? Does it go down when you sit for awhile?

97 Wrangler Sport, 4" of random lift, 33" BFG KM1s, steel bumpers
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Old 01-09-2011, 11:47 AM   #3
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Originally Posted by drewcipher88 View Post
Does your temp gauge read a good temp when you are driving? Does it go down when you sit for awhile?
temp is solid fluctuates a few degrees around 210... never much higher or lower
Doetsch 9000 nitrogen shocks
teraflex = suspension lift,steering stab,disc brakes
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Old 12-06-2011, 11:09 AM   #4
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I am having the same problem. Did you ever resolve the issue?
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Old 04-07-2013, 02:22 AM   #5
Join Date: May 2012
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I just stumbled upon this and am having the same problem. Could be a heater core leak?
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