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Old 03-17-2013, 05:15 PM   #1
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new water pump now my heater does not blow hot

i replaced my water pump on my 93 2.5 because it started leaking and now my heater doesnt blow any hot air and my heater hose going into the firewall is not getting warm any ideas? thanks

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Old 03-17-2013, 05:21 PM   #2
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Check your thermostat.
It may be jammed. Only costs a few bucks to replace it anyway, couldn't hurt.

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Old 03-17-2013, 05:28 PM   #3
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i thought of that but its running up around 210
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Old 03-17-2013, 05:47 PM   #4
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Are you sure you put the heater hoses on the water pump correct? If you reversed them you won't have heat!
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Old 03-17-2013, 06:35 PM   #5
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yes i just went and double checked there was only one top hose and one bottom hose
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Old 03-17-2013, 11:25 PM   #6
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i would say there is air in the way , run it with the cap one click loose for a little bit.
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Old 03-18-2013, 02:13 AM   #7
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Turn your hat on high run it cut the button if a 1 liter bottle off and tape it to your filet neck on the radiator and keep the bottle filed with the antifreeze mixture it should get rid of air pockets
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Old 03-18-2013, 06:49 AM   #8
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same thing happened to me ,,,you may need to reback flush your heater core...assuming you flushed your system before you replaced your pump.

i had good heat before i replaced my water pump and tstat, after my replacement i lost all heat, i then back fushed my heater core again real good and now have great heat..

best of luck
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Old 03-18-2013, 04:58 PM   #9
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ill try that thanks guys ill let you know
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Old 03-18-2013, 06:56 PM   #10
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ok i got all the air out and back flushed the heater core and the heater works better than ever thanks alot guys
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Old 03-18-2013, 09:51 PM   #11
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great!!!!! i know how cold it really gets in there without heat, i have a soft top half doors with messed up zippers and no carpet, happend to me in single deget weather for a week......freaking cold..--lol

really happy ya got your heat back,,,, stay toasty
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Old 03-20-2013, 01:29 PM   #12
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Thats whats Im experiencing now. New t-stat antifreeze is -20 degrees and low if any heat. So do I just pull the heater core hoses off and run water thru it with a garden hose
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Old 03-20-2013, 02:01 PM   #13
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I've always found the best way to bleed systems after working on them is to jack up the front of the vehicle, run it up to temp with the rad cap off and keep topping the system off as you squeeze the hoses working bubbles through. Also vary the rpms, you will see the bubbles come through the radiator cap and the level drop a little. Jacking the vehicle makes the radiator cap the highest point in the system.
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Old 03-20-2013, 02:15 PM   #14
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This happened on my ZJ too, it was luke warm flushed the heatercore with a hose, you should have seen all the gunk fly out of there. Now it's to hot...lol
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Old 03-20-2013, 04:32 PM   #15
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liftkit55 thats all i did was run a garden hose thru boths sides until i got clear water thru both hoses
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Old 03-20-2013, 04:43 PM   #16
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I will give it a try. Thanks
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Old 03-23-2013, 12:32 PM   #17
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Well raising the front didn't help. I let to run for about 20-25 minutes and no burp. Gonna try flushing heater core today.
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Old 03-23-2013, 04:58 PM   #18
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And we have HEAT. Flushed the HC both way for a bout 15-20 min back and forth and a little rusted colored stuff came out. Thanks for the tips.

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