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Thermostat lifespan? #4499365
08/27/17 11:03 AM
08/27/17 11:03 AM
Joined: Nov 2016
Posts: 1,278
WI
HoosierJeeper Offline OP
HoosierJeeper  Offline OP
Joined: Nov 2016
Posts: 1,278
WI
Getting ready for a road trip (about 600 miles round trip plus some off roading) in my Liberty next month and I got to thinking about the thermostat. I have 165k on it and the tstat is the original (every other cooling system part has been replaced, radiator, hoses, WP) I don't have any symptoms of it failing (still warms up quickly). I've read about replacement tstats (even Mopar ones which are Motorads) being finicky and sticking and people having to test them before installing and going through 2 or 3 before they open right.

So on one hand I feel like it might be foolish to swap a seemingly good one for a wildcard new one and on the other hand, I could see an old one being an issue at some point and overheating this engine usually spells death.

Any thoughts? Thanks!


15 Jeep KL Limited V6: Formula Shell 5W20
07 LR3 SE V8: Maxlife 5W30
05 Jeep KJ Limited: PHM 5W30
96 Jeep XJ Country: STP HM 5W30 (winter)
Re: Thermostat lifespan? [Re: HoosierJeeper] #4499370
08/27/17 11:06 AM
08/27/17 11:06 AM
Joined: Oct 2011
Posts: 5,091
USA
NHGUY Offline
NHGUY  Offline
Joined: Oct 2011
Posts: 5,091
USA
Never had an issue with genuine Mopar thermostats.Nor with Gates,but CST ones act very strange.I'm sure Stant is ok too.

Re: Thermostat lifespan? [Re: HoosierJeeper] #4499374
08/27/17 11:09 AM
08/27/17 11:09 AM
Joined: Jun 2003
Posts: 5,921
Illinois
SHOZ Offline
SHOZ  Offline
Joined: Jun 2003
Posts: 5,921
Illinois
My Hyundai ones got lazy. Al thought they maintained the 180F opening temp for the most part they seems to be slow to warm and in the winter would drop below 180F when coasting. Put new ones in and they run at around 185F to 190F now. Should be better for winter.

One had 150k miles the other 80k miles. Both had same Tstat.


2008 Hyundai Accent 1.6L 5 sp manual hatchback
2010 Hyundai Genesis Coupe Track 2L Turbo 6sp manual
Re: Thermostat lifespan? [Re: HoosierJeeper] #4499376
08/27/17 11:11 AM
08/27/17 11:11 AM
Joined: May 2012
Posts: 1,372
The land of USA-made Subies!
SubieRubyRoo Offline
SubieRubyRoo  Offline
Joined: May 2012
Posts: 1,372
The land of USA-made Subies!
OEM thermostats are always a little more expensive, but you also expect (and normally get) an appropriate increase in reliability and quality control for the investment. The extra money you spend on an OEM thermostat is pennies compared to the cost of being stranded just once far from home and your tools. JM2C.

Re: Thermostat lifespan? [Re: HoosierJeeper] #4499388
08/27/17 11:39 AM
08/27/17 11:39 AM
Joined: Nov 2016
Posts: 1,278
WI
HoosierJeeper Offline OP
HoosierJeeper  Offline OP
Joined: Nov 2016
Posts: 1,278
WI
If I replace it, I'll definitely go Mopar...along with a new housing. Thanks for the brand advice.

I guess my question is, do tstats have a service interval for replacement? I haven't gotten any codes for it (like I did on my LR3 when its was sticking) and I don't know if I'd rather take a trip with a new tstat or an old but proven one...


15 Jeep KL Limited V6: Formula Shell 5W20
07 LR3 SE V8: Maxlife 5W30
05 Jeep KJ Limited: PHM 5W30
96 Jeep XJ Country: STP HM 5W30 (winter)
Re: Thermostat lifespan? [Re: HoosierJeeper] #4499389
08/27/17 11:39 AM
08/27/17 11:39 AM
Joined: Jun 2003
Posts: 17,374
Deplorable in apple valley, ca
Chris142 Offline
Chris142  Offline
Joined: Jun 2003
Posts: 17,374
Deplorable in apple valley, ca
The oe mopar stats are junk. Mine stuck open @ 24k. Dealer warantied it and that one didnt make it to 50k. I put a mopar one in and it was stuck by 75k. Been using stant and robertshaw ever since.


02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: Thermostat lifespan? [Re: NHGUY] #4499402
08/27/17 12:00 PM
08/27/17 12:00 PM
Joined: Jun 2012
Posts: 678
Reno, NV
redbone3 Offline
redbone3  Offline
Joined: Jun 2012
Posts: 678
Reno, NV
I had a 98 and a 97 Dodge neon. Both had their thermostats physically break.


2014 Passat Wolfsburg, 1995 Miata.
Re: Thermostat lifespan? [Re: HoosierJeeper] #4499420
08/27/17 12:23 PM
08/27/17 12:23 PM
Joined: Aug 2004
Posts: 1,364
VA
Rhymingmechanic Offline
Rhymingmechanic  Offline
Joined: Aug 2004
Posts: 1,364
VA
It seems like the safest option here would be to buy the thermostat of your choice and pack it, along with extra coolant and a tool kit. That way you won't be stranded IF old faithful gives out.

As far as replacements go, I used a Stant thermostat when I changed the water pump on my Silverado. It didn't look as robust as the stock piece, but has been working for the past 35k miles.

Re: Thermostat lifespan? [Re: HoosierJeeper] #4499439
08/27/17 12:55 PM
08/27/17 12:55 PM
Joined: May 2012
Posts: 5,387
Fort Lauderdale, FL
DoubleWasp Offline
DoubleWasp  Offline
Joined: May 2012
Posts: 5,387
Fort Lauderdale, FL
I've installed countless Stant thermostats without an issue. Stant actually is the OEM is many cases.


07 Lincoln Navigator M1 0w-40/FU
68 Charger R/T / Supercharged 440 VR1/DBL7349
07 Ram 3500 4x4 / Cummins 6.7 /DBL7349
17 Maserati GranTurismo Cabrio
Re: Thermostat lifespan? [Re: Chris142] #4499446
08/27/17 01:06 PM
08/27/17 01:06 PM
Joined: Apr 2010
Posts: 4,409
Storrs, Connecticut
jeepman3071 Offline
jeepman3071  Offline
Joined: Apr 2010
Posts: 4,409
Storrs, Connecticut
Originally Posted By: Chris142
The oe mopar stats are junk. Mine stuck open @ 24k. Dealer warantied it and that one didnt make it to 50k. I put a mopar one in and it was stuck by 75k. Been using stant and robertshaw ever since.


+1

OEM Mopar Stats used to be made by Stant, now they are made by Motorad and quality has dropped. I maintain 3 different Jeep Cherokees with the 4.0L. All of them, including my own, have a Stant 195* Superstat and function just as the factory did.


2000 Jeep Cherokee 4.0L (181k) - Pennzoil 10w30, Napa Gold 1516, Magnefine trans filter
2009 BMW 328i (33k) - Castrol Edge Euro 0w40, MANN HU816X
Re: Thermostat lifespan? [Re: HoosierJeeper] #4499487
08/27/17 01:53 PM
08/27/17 01:53 PM
Joined: Jun 2014
Posts: 1,968
IL
Vern_in_IL Offline
Vern_in_IL  Offline
Joined: Jun 2014
Posts: 1,968
IL
OEM parts are usually really good, except any OEM part from Chrysler/Fiat....

That should tell you something about how their cars are built.

Last edited by Vern_in_IL; 08/27/17 01:54 PM.
Re: Thermostat lifespan? [Re: HoosierJeeper] #4499502
08/27/17 02:16 PM
08/27/17 02:16 PM
Joined: Nov 2016
Posts: 1,278
WI
HoosierJeeper Offline OP
HoosierJeeper  Offline OP
Joined: Nov 2016
Posts: 1,278
WI
I like Chrysler stuff, obviously. laugh
Sounds like I should go with a Stant then. I am going to replace it before winter, regardless but do you guys think I can make the trip ok with the OE one?

Going to be down a vehicle the next few weeks so kinda need the remainders to be driveable and I'm not sure if I'll have time to replace it before the trip.

Last edited by HoosierJeeper; 08/27/17 02:17 PM.

15 Jeep KL Limited V6: Formula Shell 5W20
07 LR3 SE V8: Maxlife 5W30
05 Jeep KJ Limited: PHM 5W30
96 Jeep XJ Country: STP HM 5W30 (winter)
Re: Thermostat lifespan? [Re: Vern_in_IL] #4499506
08/27/17 02:19 PM
08/27/17 02:19 PM
Joined: Oct 2005
Posts: 4,343
Kansas
Kruse Offline
Kruse  Offline
Joined: Oct 2005
Posts: 4,343
Kansas
Originally Posted By: Vern_in_IL
OEM parts are usually really good, except any OEM part from Chrysler/Fiat....


Especially crankshaft position sensors.
If you REALLY want to thump the beehive, go to any Jeep/Mopar/Fiat site and even mildly suggest an aftermarket crankshaft position sensor for your Jeep 4.0 inline.
Man, do the feathers get ruffled and the blood pressure rises!
(Even though Mopar/Daimler/Jeep/Fiat has never made an OEM Jeep 4.0 crankshaft position sensor that was worth a flip, the new FACTORY REPLACEMENT crankshaft position sensors are made in China, and I've personally had a few fail before they were in use for a year)
And before the Mopar loyalists get on my case on this site, yes, I know there are some bad aftermarket replacement cps parts out there.

Re: Thermostat lifespan? [Re: HoosierJeeper] #4499507
08/27/17 02:21 PM
08/27/17 02:21 PM
Joined: Jul 2017
Posts: 112
CO
UberArchetype Offline
UberArchetype  Offline
Joined: Jul 2017
Posts: 112
CO
I am starting to believe the [censored] thermostats sticking open issue is part of an unintended auto industry-planned obsolescence campaign. OEM's aren't going to spend time and effort sourcing high quality parts whose failure only leads to poor performing heaters and long-term issues like premature sensor failures and intake carbon build-up. Anecdotal evidence suggests even the premium brand's OEM stats are failing prematurely on an almost clockwork regular basis. Typical owners may never know they are driving a car constantly running below optimal operating temperature. They just go buy a new one after the maintenance hassles become too much.

I must be some sort of conspiracy theorist.

Re: Thermostat lifespan? [Re: HoosierJeeper] #4499511
08/27/17 02:30 PM
08/27/17 02:30 PM
Joined: Nov 2016
Posts: 1,278
WI
HoosierJeeper Offline OP
HoosierJeeper  Offline OP
Joined: Nov 2016
Posts: 1,278
WI
The Stant ones get bad reviews on Amazon....hm.


15 Jeep KL Limited V6: Formula Shell 5W20
07 LR3 SE V8: Maxlife 5W30
05 Jeep KJ Limited: PHM 5W30
96 Jeep XJ Country: STP HM 5W30 (winter)
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