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  #1  
Old November 13th, 2017, 11:57
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Yet another heat issue

so as the cold air moves in again. i am left with marginally warmish air.
i also notice that the temperature gauge fluctuates and im guessing thats from when the thermostat opens.

i was reading this http://gojeep.willyshotrod.com/Howto...Restrictor.htm

could this be an cause of the no heat issue?

what are your thoughts on this?
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  #2  
Old November 13th, 2017, 12:48
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dan1977p dan1977p is offline
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Re: Yet another heat issue

Before trying to alter how your cooling system works, you should confirm your heater core is still in good shape, blend door is doing it's job and there is no air in the system.

Usually, this is a heater core issue, though.
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Old November 13th, 2017, 13:35
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Re: Yet another heat issue

I did look into the blend door and heater core. i have an 88 and can hear the blend door opening and closing. and can tell when its switched. and i did flush the heater core twice now. and no gunk comes out and its flowing pretty good. i have a digital thermometer in the center dash and i got about 118 today and it was about 40 out today. on my hours drive to work it still ends up cold in the cabin.

i feel with the renix cooling system the coolant would just go through the tank and skip the heater core.
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Old November 13th, 2017, 18:03
Green XJ Jeep Green XJ Jeep is offline
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Re: Yet another heat issue

Is the vacuum valve opening up?
When was the last time you put a thermostat in it?
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Old November 13th, 2017, 18:49
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Re: Yet another heat issue

ill double check the vacuum valve. it is newish.
i replaced the thermostat last year when i swapped this engine into this jeep.
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Old November 13th, 2017, 21:39
lawsoncl lawsoncl is offline
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Re: Yet another heat issue

It's been quite a while since my 89 had that stupid crumbly plastic vacuum valve. As I recall it was a screwy design that let some coolant bypass the even when it was open. When I converted to the "closed" style used in the later Jeeps and plumbed directly to the heater core, my heat significantly improved. I measured 140*F air from the vent on high in 30-degree weather.
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Old November 14th, 2017, 06:20
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Re: Yet another heat issue

What does the temperature gauge show? Normal to get a ~50 degree drop in temperature from the head to the heater vents. If the engine isn't fully warmed up you won't get good heat.

Feel the heater hoses with your hand. Top hose from the thermostat housing should be hot and consistent. Lower hose return to the pump should be cool when heat is running, and same as top hose when not.
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Old November 14th, 2017, 15:35
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Re: Yet another heat issue

Today was not as bad. It was 45 out with engine temps between 175-182 and center vent fan on 2 temp 120. It wasn't as cold and raw out today.
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Old November 14th, 2017, 16:33
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Re: Yet another heat issue

Why is your engine temp only getting up to 182?
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Last edited by dan1977p; November 14th, 2017 at 16:38.
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Old November 14th, 2017, 19:27
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Re: Yet another heat issue

185 tstat? put a good quality 195 in there
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Old November 15th, 2017, 06:17
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Re: Yet another heat issue

for the most part it sits around 175. i wonder if i got the 160 one by accident. any particular brands you recommend? me and the thermostat housing are sworn enemy's.
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Old November 15th, 2017, 06:33
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Re: Yet another heat issue

I never had any issues with my 195* duralast tstat. If you're having issues with keeping the tstat in place when mounting the housing, you can apply a thin layer of rtv to the tstat and mount it on the inset part of the housing or the head (I forget which side has that right now). Just be careful to not block the weep hole in the tstat and use as little as you have to just to make sure it doesn't move. And if the housing isn't flush before you tighten the bolts, the tstat isn't in the right place and you need to restart from step one.
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Old November 15th, 2017, 07:30
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Re: Yet another heat issue

Stant Superstat is my go-to, never had a problem with them. Mopar made a slightly different model for the last couple of years (buy one for a 2001 XJ), expensive but it works well and has a built in breather to let air out.
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Old November 15th, 2017, 21:25
JeepNoob JeepNoob is offline
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Re: Yet another heat issue

Quote:
Originally Posted by ehall View Post
Stant Superstat is my go-to, never had a problem with them. Mopar made a slightly different model for the last couple of years (buy one for a 2001 XJ), expensive but it works well and has a built in breather to let air out.
Agreed. I've heard some bad stuff about Stant stuff here, but never had a problem with the Stant cap or 195-degree T-stat I put in my '96. In fact, when I first bought it, I flushed the coolant not long after and installed the Stant stuff while I was at it. 2 years later when I flushed it again, I re-used both.
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