Warning on Fail-Safe thermostat - JeepForum.com
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post #1 of 48 Old 10-05-2009, 02:32 AM Thread Starter
rtingdds
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1997 ZJ 
 
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Warning on Fail-Safe thermostat

I installed a Fail-Safe thermastat.
In 2 weeks, the thermostat malfunctioned, it stated in locked position. My car was not overheat or near overheat that may damage the thermostat.
I called the Motorad company & they denied their "life time warrantee".
Just want to lead you guys know not to buy their substandard product & don't trust their life time warrantee!


97 5.2;NP231,RE 6.5"LA;ACOS;Dynatrac D44/ProRock60 & ARBs;ARB front bumper/remote Warn/Viking line;KOR rear carrier bumper,rack,slidz,diff skit;RonDavis Alum radiator/E fan;Fitch Catakyst;FIPK;front SwayLoc & rear AntiRock;Kings;Hellas;Hi steer/brace/TomLee ram assist;4XD tank skid;35"KM2 beadlocked 5&5.5 lugs;Hushpower II;hood vents
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post #2 of 48 Old 10-05-2009, 04:20 AM
comptiger5000
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I've never heard of a fail-safe thermostat that doesn't lock open early and fail.
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post #3 of 48 Old 10-05-2009, 06:58 AM
Area.3.Fiftyone
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What the hell is a "fail safe" thermostat and why the hell would anyone need one?

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post #4 of 48 Old 10-05-2009, 08:57 AM
Chris93zj
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It's supposed to be a fail-safe...if your thermostat gets stuck, they're supposed to get stuck open, so coolant still flows. Regular thermostats can get stuck open or closed...closed and you over heat. The fail-safe ones I tried about a year ago failed miserably (2 different t-stats) and locked closed. It's all a hoax, I say. Went back to the el-cheapo t-stat and haven't had a problem since.
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post #5 of 48 Old 10-05-2009, 12:20 PM
Area.3.Fiftyone
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Thanks. I have never heard of them before.

I have never run anything but Stant thermostats in my vehicles and never had a problem with one sticking open or closed.

79' CJ7 - 82' CJ8 - 94' YJ - 96' ZJ
Diagonally parked in a parallel universe.......
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post #6 of 48 Old 10-05-2009, 12:59 PM Thread Starter
rtingdds
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Fail-Safe thermostats (made by motorad) are the "premium" brand that are sold at all the Autozone store. They highly recommended them & cost more too.
We need to pass on the message so there will be no more victims from this fail-safe crap!

97 5.2;NP231,RE 6.5"LA;ACOS;Dynatrac D44/ProRock60 & ARBs;ARB front bumper/remote Warn/Viking line;KOR rear carrier bumper,rack,slidz,diff skit;RonDavis Alum radiator/E fan;Fitch Catakyst;FIPK;front SwayLoc & rear AntiRock;Kings;Hellas;Hi steer/brace/TomLee ram assist;4XD tank skid;35"KM2 beadlocked 5&5.5 lugs;Hushpower II;hood vents
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post #7 of 48 Old 10-05-2009, 02:09 PM
WiCkeDuDe
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I dont see the point of this given the fail rate of normal thermostats.
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post #8 of 48 Old 10-05-2009, 05:29 PM
CULate
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I used a fail safe thermostat once & it failed. It also stuck open with normal engine temps. When winter came along I had no heat. The only thing I recommend is if you open up a coolant system to change parts, I find replacing the thermostat is a good thing.
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post #9 of 48 Old 10-05-2009, 07:51 PM Thread Starter
rtingdds
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So there is a lot of victims of this fail-safe thermo.
People got to stop using them.

97 5.2;NP231,RE 6.5"LA;ACOS;Dynatrac D44/ProRock60 & ARBs;ARB front bumper/remote Warn/Viking line;KOR rear carrier bumper,rack,slidz,diff skit;RonDavis Alum radiator/E fan;Fitch Catakyst;FIPK;front SwayLoc & rear AntiRock;Kings;Hellas;Hi steer/brace/TomLee ram assist;4XD tank skid;35"KM2 beadlocked 5&5.5 lugs;Hushpower II;hood vents
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post #10 of 48 Old 10-05-2009, 08:09 PM
comptiger5000
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Yep. Only seen 1 normal thermostat fail (stuck closed), and it was 22 years old in a closed cooling marine engine.
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post #11 of 48 Old 10-05-2009, 09:45 PM
BigDaveZJ
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Had a Stant get stuck shut in my ZJ a few years back out in Moab. Once everything cooled down I got a screwdriver in there to pop it back open, still doing fine.

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post #12 of 48 Old 10-06-2009, 10:54 AM
tsconver
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I also had one stick open with only moderately elevated engine temp, will never buy another one.

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post #13 of 48 Old 10-07-2009, 01:32 AM Thread Starter
rtingdds
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Man! that Motorad Fail-Safe crap really suck!

97 5.2;NP231,RE 6.5"LA;ACOS;Dynatrac D44/ProRock60 & ARBs;ARB front bumper/remote Warn/Viking line;KOR rear carrier bumper,rack,slidz,diff skit;RonDavis Alum radiator/E fan;Fitch Catakyst;FIPK;front SwayLoc & rear AntiRock;Kings;Hellas;Hi steer/brace/TomLee ram assist;4XD tank skid;35"KM2 beadlocked 5&5.5 lugs;Hushpower II;hood vents
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post #14 of 48 Old 07-04-2010, 03:26 PM
whooda
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I too just bought one, it failed on me also. Wish I had seen this before purchasing it. It never even got over 215. Drove to work at 160degrees. At idle it will not get over 130. Guess im going back to vatozone to get them to give me a new one and a gasket.
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post #15 of 48 Old 07-24-2010, 11:11 AM
mcoh1030
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Just adding a note here. THESE FAIL -SAFES SUCK.

Just had one crap out on me, within 1 day. In Florida it's hot. So I thought I'd use a 180 fail-safe. Vehicles running around 220 and naturally it "failed safely" and is not forever in the opened position. Which I assume means you'll never get heat because nothings closed to force fluid into the heater hoses.
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