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Old 01-16-2010, 12:38 AM   #1
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heat blows cold air need help

The heat in my 95 wrangler was blowing freezing cold air and would take 20 minutes to get a little warm and the temperature gauge was all over the place so i replaced the thermostat, i even put in a brand new radiator and all new hose and antifreeze before that but now the heat just blows luke warm its not like it was when i first bought the jeep. Does anyone know what this could be? could it be airbubbles and if so how do i take care of it?

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Old 01-16-2010, 12:43 AM   #2
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vacuum valve to the heater core / heater core clogged / vacuum hose

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Old 01-16-2010, 12:43 AM   #3
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Could be a clogged heater core.... When the engine is at full temp, feel both heater hoses.. If one is hot and the other cold, your core is clogged...You can try doing a reverse flush on the core. Has about a 75 % success rate when i do it for customers..... Now if both hoses are hot, i would look into the inner doors on your heater box..... Good luck..
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Old 01-16-2010, 12:45 AM   #4
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Ok thanks for the tips
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Old 01-16-2010, 06:27 PM   #5
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You could have air bubbles in the system if the guage is going up and down. It also could be a defective radiator cap not holding pressure. Did you change this with the new radiator? The coolant is always flowing through the heater core. Trying back flushing like uplifted said and make sure the heater control cables are functioning properly. If it isn't opening the door correctly you may not have full heat or it could be drawing in outside air instead.
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Old 01-16-2010, 06:30 PM   #6
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And just a heads up . If it is the heater core you DO NOT have to remove the dash.
Just 4 bolts from the engine bay side of the firewall .

A lot of jeepers have made the mistake of thinking the dash has to be removed.

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Old 01-16-2010, 08:08 PM   #7
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is the mixer door closing?
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Old 01-31-2010, 02:18 PM   #8
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I also have the same problem... Please let me know how you fixed it. I flushed the core, new cap, new radiator, ....nothing... Thanks
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Old 01-31-2010, 02:40 PM   #9
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Just fixed mine this morning since it FINALLY warmed up to the mid 20's.

Old thermostat was stuck open, guess it's been that way for a couple weeks, since the LAST time it got to be a balmy 34 degrees. Now the dash gauge shows a cozy 200 to 210 degrees and the heat will blast you out.

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