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Heater blows warm air not hot


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Old 08-14-2012, 12:23 PM   #1 (permalink)
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Have a 2002 Jeep liberty v6 3.7L and the heater blows warm air not hot. I replaced the thermostat and upper and lower hoses and coolent and it still does this. The vehicle is not overheating and the temp guage always sits in the middle or little less. Anybody have a suggestion on where I can check next?
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Old 08-14-2012, 12:33 PM   #2 (permalink)
 
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Flush heater core,if that does not work start looking at the blend door in the HVAC box.
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Old 08-14-2012, 12:39 PM   #3 (permalink)
 
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My wifes 02 has the same problem, I had to change the radiator due to a leak and I flushed the heator core in the process. It did not help, still blows warm air only.
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Old 08-14-2012, 03:22 PM   #4 (permalink)
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How would one go about flushing a heater core? I am a little nervous doing that since when I flushed the radiator and dumped the old coolent there was all kinds of stuff in there. Thinking if I did that it could loosen something and possibly crack the heater core? Is this a plausable statement?
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Old 08-14-2012, 03:23 PM   #5 (permalink)
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How would I get to the "blend door"? The compressor was replaced last week but I think it was doing that before it was replaced.
Checked the radiator and do not see any leaks or any indication of a leak in the radiator (keeping fingers crossed)
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Old 08-14-2012, 03:51 PM   #6 (permalink)
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I'd guess the impeller is starting to slip on the water pump. Warm it up, turn heater on full blast at idle. Then hold the revs at 2000 or so, does the air get hotter? Mine did. Also keep in mind, with a new water pump your old radiator may not be up to task and spring a leak like mine did.
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Old 08-15-2012, 01:54 PM   #7 (permalink)
 
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Old 08-26-2012, 03:59 PM   #8 (permalink)
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The heat blows warm air when heat is on and not hot.
While driving vehicle I would turn it all the way to the right and it blow hot air for about 2 seconds and then blow warm air and nothing else. Accelerating faster does not cause the air to blow hotter.
I rev'd engine to 2000 RPM but still maintains its luke warm temp. The temp guage always stays in middle or little under. The coolent level is a little below the cool level but no sign of any leaks or anything.
Any other ideas? Maybe some sort of vacuume leak behind dash? How hard is it to get to the blend doors to check those out? Does it require removiong the whole dash or can I get to it just behind glove box?
Thanks in advance!
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Old 08-26-2012, 08:13 PM   #9 (permalink)
 
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The blend door(hot/cold) on a KJ is controlled by a electric motor,the mode doors(vent,defrost,floor) is vacuum operated.
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Old 10-22-2012, 08:51 PM   #10 (permalink)
 
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gdlgiii, did you ever get your heater working?
I am still having the same problems as well.
I am at a loss.
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