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Old 01-25-2007, 10:28 PM   #1
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heater core?

My heater blows only cool air, even at operating temp. I turned the ac on for a few seconds, then back to heat and is helped for a few minutes but cooled off again. I changed the radiator not long ago and flushed.. didn' t seam top help much either. Also if it was the h-core would it be leaking?

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Old 01-25-2007, 10:47 PM   #2
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Unless you flushed some gunk into your heater hoses and they are clogged up... ?

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Old 01-25-2007, 10:56 PM   #3
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could be the heater control valve, check it under the hood to see if the vaccum line came off or cracked. The heater should still work if the core is leaking, checked the fluid level latly? Do you hear the vents opperating when you adjust the vent style(head/feet/defrost)?
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Old 01-25-2007, 11:39 PM   #4
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the vents do work the cool air will come from the floor vents and the dash vents but there is little air coming from the defroster when it is selected. coolent fluid level you mean?
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Old 01-26-2007, 02:55 AM   #5
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Quote:
Originally Posted by dbwvu View Post
the vents do work the cool air will come from the floor vents and the dash vents but there is little air coming from the defroster when it is selected. coolent fluid level you mean?
Yup, check your coolant level in the overflow tank.
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Old 01-26-2007, 05:31 AM   #6
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Could be an actuator. I think there are several technical service bulletins for the Heating/ac system on your year of jeep. My 02 has a similar problem that I found on the TSB's and am going to check mine out tomarrow.
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Old 01-26-2007, 11:43 AM   #7
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Sounds to me more like either your water pump or thermostat might be bad. The problem you describe is usually what happens when one of the 2 go (your engine heats up but since no fluid circulates through the engine and heater core you don't get heat inside the vehicle.) probably the only reason you get heat for a little bit whenn you turn it off then back on is the fluid in the hoses will still warm up a little from just the heat under the hood, but when you turn it back on the fan cools it down real fast since it wouldn't be near as hot as normal. I would start by replacing the thermostat first if you supect this to be your problem or both at the same time. takes about a hour for someone mechanically skilled probably 2 for a newbie.
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Old 01-26-2007, 11:49 AM   #8
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Old 01-26-2007, 01:41 PM   #9
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heater hoses are both hot but the overflow for coolant was somewhat low. What else can I look for?
thanks for the advice
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Old 01-26-2007, 01:42 PM   #10
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also I changed the thermostat when I changed the radiator adn flushed a month ago. thanks, db
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Old 02-01-2007, 07:45 AM   #11
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Fixed mine the day I previously posted but was watching it to make sure. The problem ended up being the check valve on the line next to the manifold. Unless you have already done this you might want to verify if the vent door/actuator arm for the hot and cold setting is even moving when adjusted. vacum problems is a good place to start, that one leaking check valve was causing my system to do some strange stuff.

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