W2K 5.7 thermostat question - JeepForum.com
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post #1 of 7 Old 08-28-2016, 07:10 AM Thread Starter
Pokeher
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2011 WK 
 
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Location: Toronto
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W2K 5.7 thermostat question

Hello everyone, I noticed a small coolant leak originating from thermostat housing on my 2011.

Seems like a easy fix but one question I have is does anyone know if there is a gasket between the housing and thermostat? I see that the thermostat comes with a rubber gasket but is that the only one required?

Do need one of these as well? https://amzn.com/B001UCEJHC

Thanks!!

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post #2 of 7 Old 08-30-2016, 05:57 AM
2kg4u
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If you have a leak from the thermostat housing area, there is a good possibility the housing is cracked. When you take it apart inspect the housing closely. I have not changed a thermostat on a 5.7, but in general if you get a cork gasket you can replace it with RTV, and if you get a rubber gasket you need the gasket. Is the one that came with the thermostat flat, or is it a ring with a groove in the ID that fits around the outside of the thermostat flange?

Roy
2014 Overland, 3.6 L
Fumoto Qwikvalve, Ionic CXV running boards, Michelin X-Ice Xi2 snow tires
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post #3 of 7 Old 08-31-2016, 11:29 PM
BolderGuy
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Sure it is the thermostat housing? The 5.7 water pumps are junk and leak. Had mine replaced under warranty. Just a thought - not sure where the pump is in relation to the housing.

3rd GC. ZJ, WJ and now WK2. Decked out Limited with OME lift running 275/55/20s.
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post #4 of 7 Old 09-04-2016, 07:18 PM Thread Starter
Pokeher
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Thanks for the reply's. I took a chance and just ordered a thermostat without the gasket. The housing looked OK as well.

I swapped out the thermostat today and looks like it was just the round rubber gasket that was mangled.

Very easy job to swap out. The job should take about 15 minutes if you take your time but I had a bunch of dried on coolant that took a bit to scrape off. Total time 30 minutes.

Here are a few pics of the job.

Pic 1. Tools - 10mm and 13mm socket, optional extension, flat head screwdriver

Pic 2. Air box can be removed with flat head screwdriver and 10mm socket. There is a sensor that needs to be unplugged as well.

Pic 3. You can see where the dried up coolant is leaking and dripping down. The 2 13mm bolts came off very easy. When you remove the 2 bolts, you will get some coolant leaking out and more then you remove the thermostat.

4. That gasket looks bad. I'm surprised it didn't leak more. To get a good seal, I had to scrape off all that junk that was hardened around the housing. When I put in the new thermostat, I make sure that the breather hole was on top.

I bolted everything back up and topped up the coolant that I lost - about a quart.
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post #5 of 7 Old 09-06-2016, 06:58 AM
2kg4u
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Looks like a bead of RTV, not a rugger gasket. Glad it worked out for you.

Roy
2014 Overland, 3.6 L
Fumoto Qwikvalve, Ionic CXV running boards, Michelin X-Ice Xi2 snow tires
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post #6 of 7 Old 10-28-2018, 06:22 AM
westija
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Quick question: does the thermostat come with the red gasket?
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post #7 of 7 Old 10-28-2018, 08:09 AM
BigTizzie
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T stat seems to come with a black gasket.

But there is a RA option with a red gasket.



I had a leak on the top vent screw, tightened it down. I have the guts to and sensor to replace, but haven't done the job yet.
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