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Unread 01-10-2011, 04:56 PM   #1
toates89
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No heat 2001 cherokee

Helping a friend out.

he has absolutely no heat.

he cut through the back of his glove box and i felt his heater core and its cold as ice.

he said he flushed his system and tried to blow out his heater core.

would anything besides a clogged core cause this?

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Unread 01-10-2011, 05:08 PM   #2
jeepkid03
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Just had this issue on my 2000. Turned out to be the thermostat. The engine was getting to proper temps (according to the gauge) but when I measured the hoses one only reached a max of 120*. The T-stat had stuck open, even though it was a few months old and a quality dealer part. Try getting one of those thermometers and check the temp of the hoses. If he flushed it out and it looked good that is likely your problem.
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Unread 01-10-2011, 05:10 PM   #3
tjwalker
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First off, what is the temperature reading on the coolant gauge on the dash? Cab heat is simply a byproduct of engine heat. Should be in the 200-210 range.

What is the temperature of the hoses (input / output) going into the heater core?

If one cold is hot and the other is quite a bit cooler, that can confirm a clogged heater core.

They should be "approximately" the same temperature if the core is flowing freely.

Here is a link to flushing the heater core with CLR.

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Unread 01-10-2011, 05:18 PM   #4
toates89
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i guess we will reverse flow the core and change the thrermostat again
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Unread 01-10-2011, 05:55 PM   #5
toates89
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well i was looking at some pics and it seems that what i was feeling was the AC condensor.

so maybe the heater core is getting warm. i gotta recheck everything
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Unread 01-10-2011, 06:17 PM   #6
tjwalker
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Quote:
Originally Posted by toates89 View Post
well i was looking at some pics and it seems that what i was feeling was the AC condensor.

so maybe the heater core is getting warm. i gotta recheck everything
Start by checking the temperature of the HOSES going into and out of the core...........
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Unread 01-10-2011, 06:27 PM   #7
toates89
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Quote:
Originally Posted by tjwalker View Post
Start by checking the temperature of the HOSES going into and out of the core...........
one is a bit warmer then the other. but neither get really hot
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Unread 01-10-2011, 06:30 PM   #8
tjwalker
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If coolant temp is steady at 200-210, then the most likely cause is a clogged heater core or a blend door issue. Don't forget about the HVAC routing heat into the cab...........

But my money is on a clogged heater core. If you flush, I would really recommend the CLR method as that can be much more helpful than just a garden hose flush. Takes all of an hour.
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Unread 01-10-2011, 11:30 PM   #9
leadnbrass
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I did a reverse flush on a friends Impala last week. Took all of 10 mins and the heat is great now. Hopefully this will take her till the summer when I can flush the radiator and cooling system.

Damn Dex-cool
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Unread 01-11-2011, 12:26 AM   #10
Kevin108
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Putting 100+ psi into a heater core doesn't seem like a good idea at all. Likewise, CLR says on it's own website (and in their own language) that their product is sorta likely to eat your heater core.
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Unread 01-11-2011, 12:55 AM   #11
99Greenmachine
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I bet he reached in and felt his evaporator which should feel cold....

Flushing the core is the easiest strategy...rules out a lot. If that doesn't do it, check the Vacuum lines and all the blend doors/actuators
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Unread 01-11-2011, 01:28 AM   #12
toates89
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Quote:
Originally Posted by 99Greenmachine View Post
I bet he reached in and felt his evaporator which should feel cold....

Flushing the core is the easiest strategy...rules out a lot. If that doesn't do it, check the Vacuum lines and all the blend doors/actuators
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Unread 01-11-2011, 07:21 AM   #13
globex
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I just had a xj come into the shop no heat. Second one this year. This time it was a clogged core buthe first xj was a bad blend door motor. Both pretty easy fixes.
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Unread 11-08-2013, 02:43 PM   #14
DeCubs
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2001 Cherokee Sport 4x4

I had coolant flush done last month. As I come to find out this week I had no heat. Thermo was good. No leaks with heater core. I googled and saw a guy do a reverse heater core flush. I asked the guy who did my flush and he said he never tried but was willing to try for me. 20 minutes and some nasty guke later. My heat was so hot on low I had to roll down my windows. Thanx to the you tube guy! Jeep On!
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Unread 11-08-2013, 09:32 PM   #15
MoparMech
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Check Vacuum Lines to the hvac.
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