Questions about thermostat change

TexasTJ2004

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No, I just fill it up, start and run til it reaches operating temp, let it cool, then top off the coolant through the radiator cap. May have to add a little to the reservoir after the next couple of drives.

I thought the factory procedure is to pull vacuum into cooling system, to evacuate any air. Then suck in new coolant through a valve. This way there is nothing to burp, as there was no air in the system to begin with.
 

freedom_in_4low

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I thought the factory procedure is to pull vacuum into cooling system, to evacuate any air. Then suck in new coolant through a valve. This way there is nothing to burp, as there was no air in the system to begin with.

The 06 fsm doesn't say anything about pulling vacuum.

Screenshot_20220805-212204.png


I would think you could also just disconnect the heater hose from the thermostat housing and fill until it reaches that nipple before reconnecting the hose and finish filling.
 

Longwhitejeep

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Why not to just to buy the Mopar one? The Israeli factory that makes it, is supplying the the car manufacturers all over the world, not just as a replacement, but as something that comes from the factory.
It also has the jiggle, so you don’t need to drill anything whatsoever.

Is your mopar stat stamped motorad? Mine from Amazon is but it just came in a white box and is different than the standard motorad I ordered.
 

TexasTJ2004

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It does not say anywhere Motorad. However, there is a single factory in Israel that is large manufacturer of thermostats, and it is Motorad. So I am 99% sure that what Mopar sells is Motorad.
They supply today significant percentage of cars in US, Germany and China, and I am not aware of any quality issues with their product.

A4A7B7A7-AEF9-41FD-A3DF-935FA39C1C79.jpeg
 

Longwhitejeep

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It does not say anywhere Motorad. However, there is a single factory in Israel that is large manufacturer of thermostats, and it is Motorad. So I am 99% sure that what Mopar sells is Motorad.
They supply today significant percentage of cars in US, Germany and China, and I am not aware of any quality issues with their product.

View attachment 348687

Thanks. I'm not concerned with it being motorad or not. My mopar unit didn't come in a mopar bag. It had motorad stamped on the Stat though.
 

MountaineerTom

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The thermostat I put in a few years ago when I reworked my entire cooling system was a MOPAR. Came in a bag, not sure if it had MOTORAD stamped on it or not. Everything has been working fine.
 
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TexasTJ2004

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So to summarize:
Mopar is motorad. It comes with the jiggle, so you don’t need to drill anything. Just install and be done with it.
 
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Ericshere03

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You might check out the part number I listed next time around.

i don’t think that part number you supplied is OEM. Those were the old Stant high flow, high performance mags sell them as their own brand, has a bigger valve. But if all the OEM thermostats I removed, they all looked like a Stant Superstat with a jiggler valve.
 

pagrey

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i don’t think that part number you supplied is OEM.

It's not, I've tried them back to back with the OEM style and it was easy to tell the difference. I don't think anybody needs to run them but for what they cost it's what I run. It's a thermostat, not a big deal if it's the right temperature. I just don't understand why people spend more on the wrong deal without the valve.
 

TheYellowJeep

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I have an older Stant superstat and bought another off Amazon to compare them In case anyone is interested.

Newer Stant (with MOTORAD stamped on one of the legs) on the left and the older one on the right.

View attachment 348559

View attachment 348557

View attachment 348558

View attachment 348560

View attachment 348561

View attachment 348564

I had just replaced my thermostat with what appears to be the Stant one on the left side. This was alongside the full water pump/radiator/hose/fan clutch upgrade. After letting my Jeep idle for 20-30 minutes, driving it down the interstate awhile, I have found my coolant temp to range between 194-198. It seems like it could be stuck open. Any way to specify the one on the right that's made in the US on amazon?

Also, did NOT drill a bleeder hole so maybe that could be contributing, though I believe it's been sufficiently bled.
 

MountaineerTom

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I had just replaced my thermostat with what appears to be the Stant one on the left side. This was alongside the full water pump/radiator/hose/fan clutch upgrade. After letting my Jeep idle for 20-30 minutes, driving it down the interstate awhile, I have found my coolant temp to range between 194-198. It seems like it could be stuck open. Any way to specify the one on the right that's made in the US on amazon?

Also, did NOT drill a bleeder hole so maybe that could be contributing, though I believe it's been sufficiently bled.

I’m not sure about on Amazon. Probably not. I’d check ebay. You might find some old stock with pictures to verify it’s the older version.
 

Ericshere03

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I had just replaced my thermostat with what appears to be the Stant one on the left side. This was alongside the full water pump/radiator/hose/fan clutch upgrade. After letting my Jeep idle for 20-30 minutes, driving it down the interstate awhile, I have found my coolant temp to range between 194-198. It seems like it could be stuck open. Any way to specify the one on the right that's made in the US on amazon?

Also, did NOT drill a bleeder hole so maybe that could be contributing, though I believe it's been sufficiently bled.

Sounds fine to me … put your hand on the upper radiator hose of a cold engine and let it warm up idling … that will tell you want you want to know …
 

TheYellowJeep

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Sounds fine to me … put your hand on the upper radiator hose of a cold engine and let it warm up idling … that will tell you want you want to know …

I'm pretty new to working on vehicles - if it gets hot then that would suggest that all is working well? Ambient temps are probably in the low 50s today too. This forum has me believe that anything off of the 210 mark is an absolute failure of the t-stat...

Also: I did get into contact with Stant regarding their superstat, and they referred me to MotoRad - there's our answer!
 

Jerry Bransford

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I'm pretty new to working on vehicles - if it gets hot then that would suggest that all is working well? Ambient temps are probably in the low 50s today too. This forum has me believe that anything off of the 210 mark is an absolute failure of the t-stat...
The temp will vary some below and above 210, but in uber-cold weather it could run well below that. So no it won't stay pegged to the 210 mark.
 

freedom_in_4low

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I'm pretty new to working on vehicles - if it gets hot then that would suggest that all is working well? Ambient temps are probably in the low 50s today too. This forum has me believe that anything off of the 210 mark is an absolute failure of the t-stat...

Also: I did get into contact with Stant regarding their superstat, and they referred me to MotoRad - there's our answer!

If you watch it warm up with an obd2 scanner, it'll go up to about 195, thermostat opens and the ect will dip back down as the cold coolant from the radiator circulates through the warm engine. From there it depends on load and ambient conditions - either it will sit in the low 190s or slowly rise into the 200s.

As long as it's between about 190 and 210, you're in good shape.