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Old 11-16-2012, 09:19 AM   #1
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warming up the wrangler

97 2.5 when its 15 degrees out ill let it idle for 15 minutes, it doesn't get all the way up to operating temp until I get in and drive for another 10 minutes, anybody else have issues like that? or if not, anybody know why it takes so long to warm up. my old 89 2.5 didn't take this long to get warmed up. why tj why?

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Old 11-16-2012, 09:55 AM   #2
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Thats about normal for my I6 here in MI, its a BIG hunk of cast iron to heat up! If I want heat when I warm it up it takes at least 20min at idle. You may want to look into an electric block heater. You plug the jeep into 110 on the cold nights and it keeps the cast iron block warm for fast start/warm ups.

You may also need a new thermostat if its not normal behavior. The thermostat will heat up the block then circulate. If its bad, it will always circulate and take forever to get warm.

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Old 11-16-2012, 10:41 AM   #3
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I have a back heater, but nowhere to plug it in.
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Old 11-16-2012, 02:46 PM   #4
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My guess is your thermostat is hanging up & letting water circulate through the radiator before it should. I'd install a new conventional (non fail-safe) 195 degree thermostat from Stant or Robertshaw.
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Old 11-16-2012, 05:59 PM   #5
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Quote:
Originally Posted by Jerry Bransford
My guess is your thermostat is hanging up & letting water circulate through the radiator before it should. I'd install a new conventional (non fail-safe) 195 degree thermostat from Stant or Robertshaw.
thanks Jerry, do any regular parts stores sell those type? or is it special order kinda stuff. ive got carquest O'Reilly AutoZone and Napa within easy driving access.
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Old 11-16-2012, 06:00 PM   #6
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Any worthy auto parts store will have a Stant or Robertshaw 195 degree thermostat hanging on one of the aisle displays. Just avoid any thermostat that claims to be fail-safe. Make sure to get a gasket with it, they are sold separately... don't use RTV. And make darned sure both gasket surfaces are absolutely positively 100% clean & no old gasket material is on them which will cause it to leak. Use a wire brush on both surfaces to make sure they are absolutely pristine.
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Old 11-16-2012, 06:05 PM   #7
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oky doky I appreciate it. so my next question is, how long should it take with this new thermostat installed to warm up? bearing in mind its been between 15-20 degrees outside when I go to work.
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Old 11-16-2012, 06:08 PM   #8
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I dunno, I never timed it. What, 5-10 minutes max?
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Old 11-16-2012, 06:47 PM   #9
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It gets cold in Utah, but always heats up to normal temp with about 5 miles of driving 30 mph. Sounds like a bad thermostat to me.
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Old 11-16-2012, 06:56 PM   #10
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would getting a bra for it help for the mornings its gonna be -15 to -20? ive been told they help but haven't ever tried, if so any good brands to look at preferably less than $100
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Old 11-16-2012, 06:59 PM   #11
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Your TJ hasn't done anything to deserve the indignity of being forced to wear a bra. Slip a piece of cardboard in through the grill slots if need be but a new 195 degree thermostat is the likely cure for the slow to warm engine.
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Old 11-16-2012, 07:02 PM   #12
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lol bras aren't that bad, not those grill blanket ones.
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Old 11-16-2012, 07:30 PM   #13
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I drove home 4.5 miles and after 3.5 miles it was up to temp. The thermostat needs some attention.
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Old 11-16-2012, 07:31 PM   #14
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I was just looking at some block heaters on ebay for the 4.0/4.2. Where on the motor do they mount?
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Old 11-16-2012, 07:36 PM   #15
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my block heater is inline with the engine coolant. it mounts near the heater core.
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Old 11-16-2012, 07:40 PM   #16
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I always thought letting a vehicle idle like that wasn't good for it, specifically in cold weather for initial start? And I also always thought the fastest, and proper, way to warm it up was to drive it at a moderate speed?
Assuming of course don't have engine block heater like mentioned by a prior poster.
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Old 11-16-2012, 07:45 PM   #17
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I let my idle stabilize and then drive slow, its about 2.5 miles with a speed limit of 35mph before hit main road anyway, and before I reach end of that my heat is performing as I expect
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Old 11-16-2012, 07:59 PM   #18
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why would idling the engine be bad for it. that doesn't make sense.
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Old 11-16-2012, 08:06 PM   #19
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Quote:
Originally Posted by tallzdatank
why would idling the engine be bad for it. that doesn't make sense.
I was asking a question not posing a statement but a quick Internet search leads to pretty consistent results. Most state that the most effective/fastest way to warm a vehicle is to drive. And several sites, and there is some disagreeable info as well, that bc it's colder and takes longer to warm up some fluids like oil are not efficient which causes unnecessary wear on the motor.
Now many also preface stating 'modern' engines I dunno if the 2.5 or 4.0 qualify as modern. Hence, my question.
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Old 11-17-2012, 02:40 AM   #20
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with today's engine oil formulations it is not necessary for a a complete warm up before driving provided you keep rpms low until you reach full warm up....sure you can start it and let it idle for a half hour but that likely does more harm than good. from a cold start, 60 seconds of warm up time then moderate driving speed is fine.
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Old 11-17-2012, 03:12 AM   #21
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Is it true letting it idle for long can lead to a bad cat?
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Old 11-17-2012, 06:18 AM   #22
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Vehicles now a days don't need to be warmed up, per se, but only for a few seconds.

A bra on a Jeep? That has to be one of the funniest things I've ever heard! I'd be embarrassed to be seen in it!!

How good is the coolant in your Jeep? Maybe it's weak. Between that and a new thermostat, should be your only issue.

My Jeep, 4.0L, used to be warmed up before I even got outside the village limit here, which is only 1.9 miles from my house. Only warmed up for a few seconds before I took off also. Temp blowing out the vents is 210 degrees, which is exactly what the temp gage has always ran at.
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Old 11-17-2012, 06:38 AM   #23
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I just sold my Dodge Cummins diesel pick up and those things take forever to warm up but one trick I learned that really impressed me to get heat quicker was to put the A/C on but the temp control onto hot.
I forgot why this worked so well but it was probably three times quicker to get heat in the cab.
I also would not recommend cardboard in the grill, when cardboard gets wet and/or forgotten about it will break down and possibly clog up the radiator.
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Old 11-17-2012, 08:58 AM   #24
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I ran a piece of cardboard in my 4.0 last year.. sprayed some black paint on both sides and zip tied it to the cross supports in there, it lasted all winter with getting wet and such and didnt break down at all
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Old 11-17-2012, 09:04 AM   #25
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When I replaced my factory cooling fan with a electric fan one of the things i noticed
was much faster warm up time.
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Old 11-17-2012, 12:02 PM   #26
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Quote:
Originally Posted by scott howard
When I replaced my factory cooling fan with a electric fan one of the things i noticed
was much faster warm up time.
How hard was it to replace? I'm thinking of doing that so when I go trough water I can turn the fan off.
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Old 11-17-2012, 09:11 PM   #27
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Quote:
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How hard was it to replace? I'm thinking of doing that so when I go trough water I can turn the fan off.
It is not hard at all to do and can be done without removing the radiator but taking it out does make it even easier.
I have them on three of my five and they all do a great job of controlling the temp.
I have the adjustable thermistor so i can set it a little warmer in the winter and set it back to 195 for the summer.
And yes having the ability to shut it off when crossing water is very nice.
And it warms up a lot faster because it does not come on until it reaches a set temp unlike a stock fan that runs and cools as soon as you start the engine.
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Old 11-17-2012, 09:56 PM   #28
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Quote:
Originally Posted by fan of fanboys View Post
I always thought letting a vehicle idle like that wasn't good for it, specifically in cold weather for initial start? And I also always thought the fastest, and proper, way to warm it up was to drive it at a moderate speed?
Assuming of course don't have engine block heater like mentioned by a prior poster.
Not the best for it because it has longer for combustion created moisture ans acids to condense in the oil. Not that bad for it like in the carburetor days though where there was more fuel dillution to the oil and carbon build up. Still, if you are heading out to get it up to temperature for a while, the mosture should mostly evaporate.

Quote:
Originally Posted by bostiguy View Post
...one trick I learned that really impressed me to get heat quicker was to put the A/C on but the temp control onto hot.
I forgot why this worked so well but it was probably three times quicker to get heat in the cab...
That works. It puts an extra load on the engine making it work a little harder and so it heats up faster...Like pulling a tiny trailer.
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Old 11-18-2012, 11:02 AM   #29
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Quote:
Originally Posted by scott howard

It is not hard at all to do and can be done without removing the radiator but taking it out does make it even easier.
I have them on three of my five and they all do a great job of controlling the temp.
I have the adjustable thermistor so i can set it a little warmer in the winter and set it back to 195 for the summer.
And yes having the ability to shut it off when crossing water is very nice.
And it warms up a lot faster because it does not come on until it reaches a set temp unlike a stock fan that runs and cools as soon as you start the engine.
Thanks.

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