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Unread 02-06-2013, 07:04 AM   #1
WJlover
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how long does your dub take to heat up?

i just want to make sure im not the only one.

on a cold morning, i run out to my jeep, start it and run back inside like any new englander does.
but it seems to be taking upwards of 30 minutes to get to temp! every other car ive owned has taken 10-15 minutes.


that and my heat is luke warm so its not like letting it heat up really matters.
anyone else?

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Unread 02-06-2013, 07:14 AM   #2
AntonWJ
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My WJ I6 takes about 15min to warm up on a cold morning (28F) but it never even reaches close to the 240 mark on the temp gauge (dead center). But I do have a problem with the thermostat that I need to replace.
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Unread 02-06-2013, 07:35 AM   #3
ChrisHager
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I think today it was high 20's when I started mine. I drove 2 miles and it was warming up enough to turn the heat on. Usually, 5 minutes of driving or so and I'm good to go. I agree with the above as well - mine never reaches the 240 mark.
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Unread 02-06-2013, 07:39 AM   #4
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I had that problem with my jeep before the motor locked up. would go out 20 min early and start it 10-20deg out side and drive to work 10 min with no heat. I had a leak at the thermostat. Pulled in in the shop to look at it because the temps was dropping to 0-5 deg. Found out had air in the system I think from the leak. Got that out did same thing on the really cold days and had hot heat hot a nuff I had to turn it down.
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Unread 02-06-2013, 09:12 AM   #5
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The temp outside today 10 degrees, drove about 2 miles and the engine temp got to 150 and the heat turned on.
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Unread 02-06-2013, 09:25 AM   #6
Cirruslydakota
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Originally Posted by ChrisHager View Post
I think today it was high 20's when I started mine. I drove 2 miles and it was warming up enough to turn the heat on. Usually, 5 minutes of driving or so and I'm good to go. I agree with the above as well - mine never reaches the 240 mark.
Same, after about 5 2-3 minutes its hitting 140-150 on my temp gauge and I turn the heat on low, by 10 minutes the thermostat has already opened up and its toasty warm air coming out of the vents.
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Unread 02-06-2013, 11:58 AM   #7
WJlover
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i could drive mine for 5 miles and it will just be getting warm by the end.
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Unread 02-06-2013, 12:02 PM   #8
1salem1
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It depends on the oil you use i was using 5w30 and it take less time to get warm than the 10w30 which i now use
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Unread 02-06-2013, 12:05 PM   #9
WJlover
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im using 5w 30 now. was using 10w40 before and no change.

once i have the money ill replace the thermo and maybe do a coolant flush.
probably needing one anyways.
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Unread 02-06-2013, 12:34 PM   #10
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I would start with your cooling system. It is a possibility that your thermostat is open or partially stuck open, not allowing your vehicle to warm up to temp without not being cooled down. 30 minutes is quite a bit to reach temp, even in these temperatures. Air in the cooling system will actually do the opposite, and the thermostat may not want to open due to the trapped air. Causing it to not open and reach optimal temp faster than usual.

Start with the easy things first, and I would start by checking on your thermostat to be sure it isn't open all the time.
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Unread 02-06-2013, 12:36 PM   #11
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And if your heat isn't very warm after it's optimal temperature, you may have 1 or more things going on. Low coolant, stuck open thermostat, plugged heater core, air in the system, plugged cooling system aswell. Recirc doors go, blend doors go, HVAC assemblies go....
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Unread 02-06-2013, 12:42 PM   #12
WJlover
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ill start with the cooling system.
dont know much about the heater core but i see enough on here that makes me never want to go near it.
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Unread 02-06-2013, 12:50 PM   #13
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Quote:
Originally Posted by KonLegend View Post
And if your heat isn't very warm after it's optimal temperature, you may have 1 or more things going on. Low coolant, stuck open thermostat, plugged heater core, air in the system, plugged cooling system aswell. Recirc doors go, blend doors go, HVAC assemblies go....
Quick question. My jeep seems to output great heat on the recirculation setting, but rather poorly on all others. Would that suggest recirculating door fine but blend faulty?
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Unread 02-06-2013, 07:34 PM   #14
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Originally Posted by uberjon View Post
Quick question. My jeep seems to output great heat on the recirculation setting, but rather poorly on all others. Would that suggest recirculating door fine but blend faulty?

That usually is the case, although I have seen malfunctioning recirc doors and blend doors at the same time that have that same symptom. But yes, that does shout blend door to me, may want a few opinions
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Unread 02-06-2013, 07:40 PM   #15
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Originally Posted by WJlover View Post
ill start with the cooling system.
dont know much about the heater core but i see enough on here that makes me never want to go near it.
Is yours the 4.0 or 4.7? Heater cores are fairly simply to flush, the 4.7's best spot is right behind your PCV Valve, or oil cap. Follow those lines down and you will see it plug into the block, that's where I flush mine out. The 4.0's are easier, and the trick to doing those flushes, is to back flush the core a few times. I would start with flushing it the way the coolant goes through, ( usually it's the top heater core hose ).
Hook a hose up to one end and let it run out the other hose, ( you should have 2 heater lines disconnected ). Then repeat the opposite way. Some use compressed air as well, just be careful not to use too much as you can rupture a core doing so. Make sure there is water in the core if you use air.

It's a good maintenance anyways to do, I work at a Midas shop so I get really good discounts, but I flush the heater core out at least once a year.
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