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Old 01-25-2013, 11:53 PM   #31
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Pulled the pump today....it looks like new inside. Going to put it back together tomorrow. Going to flush the core again while it's apart. I will get heat....I will win....thinking positive.

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Old 01-26-2013, 07:06 AM   #32
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Take heater core hoses off where they mount to the engine and hook up a garden hose and flush it both ways for a long time and then do it again.Ive flushed sons 2000 3 times now and Im still getting junk out of it.

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Old 01-26-2013, 12:09 PM   #33
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Picked up flushing chemical. New thermostat. New cap. Going to put it all together and see what happens.
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Old 01-26-2013, 10:12 PM   #34
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Well...put it all together and did a complete system flush. Thought why keep flushing the heater core and have the rest of the junk in the system plugging off the core. Found that the pump was not as good as I thought. After flushing the pump seal was shot. Must have been enough junk in it to keep it from leaking. Off the the parts shop in the morning for a new pump. Hope it works....forecast is for -35C for Tuesday.
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Old 01-27-2013, 10:06 PM   #35
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New pump is in....no leaks...now to see if I have heat. Won't know till Tuesday night.
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Old 01-30-2013, 07:06 AM   #36
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Minus 31C last night and minus 18C this morning and jeep is warm ...life is getting better!
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Old 01-30-2013, 10:34 AM   #37
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Quote:
Originally Posted by jeepsrgreat View Post
Well...put it all together and did a complete system flush. Thought why keep flushing the heater core and have the rest of the junk in the system plugging off the core. Found that the pump was not as good as I thought. After flushing the pump seal was shot. Must have been enough junk in it to keep it from leaking. Off the the parts shop in the morning for a new pump. Hope it works....forecast is for -35C for Tuesday.
Exactly what happened with mine. Glad it is working for you.
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Old 04-06-2013, 10:00 AM   #38
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This is exactly how my pump on my 1999 looked. $30 for a new one, not rebuilt, at NAPA.
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Old 01-07-2014, 09:12 PM   #39
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Just re-read and bumping this thread... given the "polar vortex" it may be worthwhile for some of you guys north of the Gulf Coast...
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Old 01-07-2014, 09:56 PM   #40
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Thanks for bumping this thread. I found out tonight that my heat doesn't work very well. It looks like I will start with a heater core flush this weekend once it warms up. We're not used to this freezing crap in GA.
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Old 01-10-2014, 04:41 PM   #41
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That was the trick. The heat works great.
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Old 01-10-2014, 09:14 PM   #42
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Glad it worked for you. Much easier than replacing the water pump.n
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Old 03-06-2015, 05:25 PM   #43
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I have a 2006 Rubicon that has had a new water pump and heater core installed in the last year. Defrost is hardly working. The higher the fan speed the cooler the air coming out of the vents. Blend door is working as it should.
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Old 03-06-2015, 06:14 PM   #44
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I have a 2006 Rubicon that has had a new water pump and heater core installed in the last year. Defrost is hardly working. The higher the fan speed the cooler the air coming out of the vents. Blend door is working as it should.
Old thread but how old is your thermostat? Sounds like no heat circulation. What does temp gauge show?
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Old 03-07-2015, 09:47 PM   #45
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I tried everything myself before I was about to run the jeep off a cliff. The coolant flush gave me a 3 degree diff in heat. This could also have just been a warmer day. The garden hose did help, and gave me at least 5 degrees more of heat. My first understanding was yes water pump could be a problem and or the thermostat aswell. The jeep stayed in operating temps during hot days, so water pump was good and so was coolant level when checked. I checked the radiator hose on a cold day and that was pretty hot. What wasn't very hot was the return hose from the heater core. There was a significant temp difference between upper and lower heatr core hoses. Because I noticed improvement with the garden hose, I decided to turn up the pressure, but not with water but with air. I used a blow gun (Pocket Blow Gun with Industrial Coupler) and I did one hose at a time, rinsing out with garden hose in same direction as air was blown each time, I worked my way up with increasing air pressure each time. I must have done this 8 times each hose and put it all back together. On a cold day my heater air went from 80-85 degrees tops to 110-120. I know too much air pressure can be dangerous, but it was risking that or replacing the heater core.

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