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  #1  
Old November 24th, 2007, 08:30
Me007gold Me007gold is offline
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no heat

its starting to get "cold" and ive disovered that my heat is not working. It is not overheating at all, the temp is running a little but under 210. the blower motor is working, cuz it is blowing a lot of cold air out. also some times when i move the knob to tell it where to place the air, there is a delay. Do i have a vacume leak somewhere? and if so how do i find it? i also flused my radiator yesterday and that didnt help either
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Old November 24th, 2007, 08:41
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Re: no heat

Are you sure the water level is full? Also, I would pull hoses off the heater core and flush it seperately when I do a radiator flush. A delay with the air could mean a small vacuum leak, but mine does that too and I have no issues with heat. Run the jeep for about 10 minutes and feel the heater hoses, one should be fairly warm and the other should be a little cooler with the heater on.
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Old November 24th, 2007, 08:42
Me007gold Me007gold is offline
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Re: no heat

yes the level is full as well as the radiator, i flushed it with a maching at work, and after i filled the system completly.
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Old November 24th, 2007, 08:52
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Re: no heat

Okay....check the hoses...one hot, one luke warm.

If they are both cold you have no heat going through the core. If one is warm, but the other is cold, then the core is probably plugged. If both are warm and close in temp to each other, then the problem is the in dash control doors. That very well could be vacuum related. Also..park under a tree maybe? Leafs can clog and block door movement if the screen is torn or missing on the cowl air intake area.
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88 MJ on 40's. 98 XJ on 35's. 98 Dodge, 52lbs of boost. 94 Miata LS4. 70 Buick GS455. 01 Harley, been to 46 states. 05 KTM, 576cc. 06 Husky 450, Kims 2011 R6, Kims. 99 Toyota Avalon, daily. 97 Miata, Kims.
And everything fits in the garage!
Kill yourself, or die trying!
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  #5  
Old November 24th, 2007, 09:17
Me007gold Me007gold is offline
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Re: no heat

just drove around the block a few times, both hoses are warm. is it possible that the temp selecting switch went bad? and no i do not park near any trees
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Old November 24th, 2007, 09:18
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Re: no heat

flush the rad. core seperately and check for vacuum leaks.

when I say flush seperately, I mean disconnect the input AND output hoses as well as the vacuum switch that's between the hoses and the heater core, then use a garden hose and flush top to bottom, then bottom to top, and top to bottom again. repeat until the gunk is out...it should mostly come out with the bottom to top.
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Old November 24th, 2007, 09:19
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Re: no heat

yes, it is possible that that switch went bad.

you don't actually need it, you can eliminate it. if you eliminate it, then plug the vacuum line that leads to it. I did this on my xj and haven't regretted it.
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Old November 24th, 2007, 09:24
Me007gold Me007gold is offline
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Re: no heat

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Originally Posted by jeepcomj
yes, it is possible that that switch went bad.

you don't actually need it, you can eliminate it. if you eliminate it, then plug the vacuum line that leads to it. I did this on my xj and haven't regretted it.
if i were to eliminate it, how would i go about doing it?
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Old November 24th, 2007, 10:57
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Re: no heat

Sounds like your Heater control valve has gone bad if both heater hoses are hot. It is a valve that is inline in one of your heater hoses. Normally pretty cheap too.
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Old November 24th, 2007, 14:11
Me007gold Me007gold is offline
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Re: no heat

Quote:
Originally Posted by tow2topgun
Sounds like your Heater control valve has gone bad if both heater hoses are hot. It is a valve that is inline in one of your heater hoses. Normally pretty cheap too.
according to autozone and advance auto online my jeep dosnt have a heater control valve.
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  #11  
Old November 24th, 2007, 14:13
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tow2topgun tow2topgun is offline
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Re: no heat

Hmmm, Never have heard of not having one. What year is it? Check NAPA Online.
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  #12  
Old November 24th, 2007, 14:14
Me007gold Me007gold is offline
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Re: no heat

its a 98


Last edited by Me007gold; November 24th, 2007 at 14:19.
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  #13  
Old November 24th, 2007, 14:34
Pelican Pelican is offline
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Re: no heat

This valve was eliminated on later models.
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  #14  
Old November 24th, 2007, 14:53
WEJOXJ WEJOXJ is offline
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Re: no heat

If the above suggestions fail (they are cheaper and easier than the next step). Look at the heater core. easiest thing here is the thermostat, fluid, flush sometimes, but if the first two don't add up to anything, I am thinking heater core, which still isn't bad to replace. Need the core, gasket and sealant. Still hope this isn't the case for you.
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  #15  
Old November 24th, 2007, 14:54
WEJOXJ WEJOXJ is offline
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Re: no heat

The temp issue tells me that the core isn't picking up any heat though since you're engine is getting hot.
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