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motorad failsafe thermostats? #2791248 11/02/12 06:51 PM
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eoghan Offline OP
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Anyone had experience with these? Are they any good or should I stick with something like stant? it will go in a 2002 Dodge Grd Caravan 3.3L.


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Re: motorad failsafe thermostats? [Re: eoghan] #2791260 11/02/12 06:56 PM
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chevys10 Offline
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Had one in my Mazda that failed within a year. Had another one in my Chevy S-10 that was fine for years.


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Re: motorad failsafe thermostats? [Re: eoghan] #2791269 11/02/12 07:01 PM
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NHGUY Offline
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I believe if OEM was good enough to last 11 years,another OEM will do the trick...even though it may be made by Stant or someone else under the Mopar label.

Re: motorad failsafe thermostats? [Re: eoghan] #2791284 11/02/12 07:16 PM
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Chris142 Offline
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Absolute garbage! Whats the point anyway? So your engine gets to 230F, so what. But the thermostat hangs open and now you must replace it.

It's been my experiance that those failsafe stats lock open @ normal operating temps. That 3.3L in that van will hit 230F very often believe it or not. The temperature guage is a dummy guage anyway. As long as it's between 190 and 230 the needle stays in the normal area. Once up to about 240F it will move 1 click towards hot.

Last edited by Chris142; 11/02/12 07:18 PM.

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Re: motorad failsafe thermostats? [Re: eoghan] #2791290 11/02/12 07:22 PM
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Quest Offline
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If it's imported engines/import car brands, always go with OEM.

No use fuzzing over a few bucks of savings, only to have them (non OEM aftermarket shxt) fail on you prematurely, or when you least expected).

I have had excellent luck with OEM Honda, Mazda, Mitsu and Toys. I dropped STant and motorad thermostats during my servicing over a decade ago, due to high failure rate and inconsistent performance (e.g. motorad failsafe didn't keep the unit wide open when failed, but instead completely shut which lead to partial engine overheating).

Q.


"Internet discussion boards act as echo chambers for conspiracy dittoheads" A.Allen
Re: motorad failsafe thermostats? [Re: eoghan] #2791292 11/02/12 07:23 PM
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Oldmoparguy1 Offline
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Originally Posted By: eoghan
Anyone had experience with these? Are they any good or should I stick with something like stant? it will go in a 2002 Dodge Grd Caravan 3.3L.


I tried 2 different brands, both failed within a year. Get the oem ones from Dodge dealer. They are high quality and cheaper then the so-called failsafe ones. I even use the 3.3 Tstats in my turbo 2.5 Caravan. Works great..

Wayne


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Re: motorad failsafe thermostats? [Re: eoghan] #2791296 11/02/12 07:32 PM
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J281v8 Offline
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Stick with oem and change it when you change the the coolant. A failsafe thermostat will either keep you in open loop (too cold)or make you overheat if it fails depending on weather or driving conditions.


1994 2.3L Ranger CAT 7W-2326 Rotella T6 5-40 257K
1993 5.0L LX FL-1A MaxLife 10-30 116K
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Re: motorad failsafe thermostats? [Re: Chris142] #2791309 11/02/12 07:55 PM
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Drew99GT Offline
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Originally Posted By: Chris142
Absolute garbage! Whats the point anyway? So your engine gets to 230F, so what. But the thermostat hangs open and now you must replace it.

It's been my experiance that those failsafe stats lock open @ normal operating temps. That 3.3L in that van will hit 230F very often believe it or not. The temperature guage is a dummy guage anyway. As long as it's between 190 and 230 the needle stays in the normal area. Once up to about 240F it will move 1 click towards hot.


I agree. Garbage, Would never buy one ever again. You can search for my experience with Motorad. Should have taken Chris's advice.

Re: motorad failsafe thermostats? [Re: J281v8] #2791320 11/02/12 08:10 PM
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HTSS_TR Offline
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Originally Posted By: J281v8
Stick with oem and change it when you change the the coolant. A failsafe thermostat will either keep you in open loop (too cold)or make you overheat if it fails depending on weather or driving conditions.

No need to change thermostat at every coolant change(about 3-4 years). Only change it when it failed.

I change coolant in my LS400 every 3-4 years with Prestone or Peak, the thermostat was changed once about 7-8 years ago. The car is 19 years old and 300k miles now.

My 13 years old E430 with 14xk miles has original thermostat and water pump, the coolant was changed 3 times (every 3-4 years).


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Re: motorad failsafe thermostats? [Re: eoghan] #2791331 11/02/12 08:21 PM
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eoghan Offline OP
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Originally Posted By: eoghan
Anyone had experience with these? Are they any good or should I stick with something like stant? it will go in a 2002 Dodge Grd Caravan 3.3L.


also this is a flex fuel e85 vehicle - current factory thermostat is stuck partway open, last couple of days engine has not reached normal temp and heater is much cooler than normal.


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Re: motorad failsafe thermostats? [Re: eoghan] #2791336 11/02/12 08:24 PM
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Avoid "failsafe" t-stats like the plague. Just stick to a OEM t-stat and be worry free.


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Re: motorad failsafe thermostats? [Re: HTSS_TR] #2791347 11/02/12 08:36 PM
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J281v8 Offline
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Guess I was wrong. Hope the rest of my post made sense.


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Re: motorad failsafe thermostats? [Re: eoghan] #2791351 11/02/12 08:42 PM
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Quest Offline
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Originally Posted By: eoghan
Originally Posted By: eoghan
Anyone had experience with these? Are they any good or should I stick with something like stant? it will go in a 2002 Dodge Grd Caravan 3.3L.


also this is a flex fuel e85 vehicle - current factory thermostat is stuck partway open, last couple of days engine has not reached normal temp and heater is much cooler than normal.


flex-fuel or not is irrelevant in this case. Just get an OE replacement thermostat, refill coolant (purge properly) and be over with it.

We deal with water-cooled diesel engines with failed thermostat the same way as gasoline/NG engines: replace t-stat and refill coolant.

Q.


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Re: motorad failsafe thermostats? [Re: Chris142] #2791449 11/02/12 11:00 PM
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Originally Posted By: Chris142
Absolute garbage! Whats the point anyway? So your engine gets to 230F, so what. But the thermostat hangs open and now you must replace it.

It's been my experiance that those failsafe stats lock open @ normal operating temps. That 3.3L in that van will hit 230F very often believe it or not. The temperature guage is a dummy guage anyway. As long as it's between 190 and 230 the needle stays in the normal area. Once up to about 240F it will move 1 click towards hot.


This makes absolutely no sense to me. The reason to use a failsafe is that it's suppose to fail in the open position (run cool) rather than fail closed and cause the engine to overheat.

Re: motorad failsafe thermostats? [Re: eoghan] #2792017 11/03/12 04:22 PM
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Chris142 Offline
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the term failsafe is wrong.they fail open because they have a hook and when the engine hit a certain temp the hook catches on the piston which holds it open. they basically let you know that your engine got to around 230f which is still a normal temp depending pn corcumstances. once a failsafe locks open you can unhook it and it will work again until it hits 230f again.


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