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post #1 of 12 (permalink) Old 02-17-2018, 03:05 PM Thread Starter
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Join Date: Jan 2018
Location: Southern USA
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Model year: 2008
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Hello Commander folks!

I am new to this forum. I appreciate all of the informative threads. I was trying to post a specific question that I had, but it tells me that I cannot create a new post - what's up with that ?


EJC
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post #2 of 12 (permalink) Old 02-17-2018, 03:23 PM
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Join Date: Jun 2013
Location: California
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You have to be active on the forum for a little while with comments before you're allowed to create posts. This rule was implemented as a way to combat constant spam that popped up on the forum awhile back. In the meantime, you can post your question in this thread and we'll do our best to answer.
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2006 XK Limited, Hemi, QDII
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post #3 of 12 (permalink) Old 02-17-2018, 03:30 PM Thread Starter
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Join Date: Jan 2018
Location: Southern USA
Own a Commander?: Yes
Model year: 2008
Trim Package: Limited
Power-Train: 5.7L V-8 Hemi
4WD
If 4WD - system: QD-II
Current Mileage: 200500
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Thanks for the reply - that makes sense.
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post #4 of 12 (permalink) Old 02-17-2018, 03:55 PM Thread Starter
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Join Date: Jan 2018
Location: Southern USA
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Model year: 2008
Trim Package: Limited
Power-Train: 5.7L V-8 Hemi
4WD
If 4WD - system: QD-II
Current Mileage: 200500
Posts: 8
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Water Outlet (aka Thermostat Housing) ?GASKET?

2008 Jeep Commander 5.7L thermostat replacement question:
A metal connector bolts onto the water pump in order to connect the upper radiator hose to the water pump (MOPAR calls it a THERMOSTAT HOUSING whileothers call it a WATER OUTLET).

This is not a traditional thermostat housing - the t-stat actually fits directly into the water pump, and the part in question bolts over that area of the water pump with the t-stat having its round gasket slightly protruding into the connector. MOPAR does not seem to indicate a "THERMOSTAT HOUSING" gasket. Others, however, sell a "WATER OUTLET GASKET".


I cannot determine if my situation is factory, but there is, currently, no gasket for this metal to metal connection to the water pump. What are the thoughts on using the "WATER OUTLET GASKET" or "THERMOSTAT HOUSING GASKET" as an added precaution?

I do not feel great about putting metal to metal with no gasket.


Thank you for your thoughts,
EJC

Last edited by 2008JC; 02-17-2018 at 03:58 PM. Reason: some words were not separated by a space
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post #5 of 12 (permalink) Old 02-17-2018, 04:04 PM Thread Starter
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Join Date: Jan 2018
Location: Southern USA
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Model year: 2008
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Power-Train: 5.7L V-8 Hemi
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If 4WD - system: QD-II
Current Mileage: 200500
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Water Pump Gasket - alone or dressed?

2008 Jeep Commander 5.7L water pumpreplacement question:
Replacing orig water pump after 189,900 miles

This water pump has a serpentine-like "rubber" gasket that fits in achannel around the water pump. This is similar to an o-ring (it is NOT an o-ring); it only fitsin one direction, and it sits up out of the channel.

The original fitment does not seem to have used anything other than thegasket. That is, there is no evidence of gasket compound such as Permatex, etc.This fitment has endure 190,000 miles.

I have read mixed messaging about using silicone or other gasket material alongwith the channel gasket on this specific vehicle. I am inclined to simplyinstall the new pump with the gasket only, but I would welcome additionalthoughts on this matter.



Thanks,
EJC
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post #6 of 12 (permalink) Old 02-17-2018, 04:18 PM Thread Starter
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Join Date: Jan 2018
Location: Southern USA
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Current Mileage: 200500
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Flush cooling system after new water pump install

2008 Jeep Commander 5.7L requires, per manual, HOAT antifreeze/coolant. Zerex G-05 says that it is the approved HOAT for Daimler Chrysler. Any opinions?

Also, what are the thoughts on flushing the system with distilled water (assuming the effluent looks good)?

I installed new pump, and I would rather not subject new equipment (pump,gaskets, thermostat, cap) to chemical flush if not necessary. Since it had a decent, regular leak, it sort of had a long, slow flush of new coolant (not optimal, I know).

Thanks,
EJC

Last edited by 2008JC; 02-17-2018 at 04:19 PM. Reason: spacing
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post #7 of 12 (permalink) Old 02-17-2018, 04:48 PM
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Join Date: May 2017
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The gasket is the rubber ring on the actual tstat...you can put an extra gasket on the housing/outlet if you want for good measure...not necessary though

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post #8 of 12 (permalink) Old 02-17-2018, 07:18 PM
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Join Date: May 2006
Location: Orlando, FL
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HOAT antifreeze/coolant. Zerex G-05 is what you need unless you buy the MOPAR from the dealer
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post #9 of 12 (permalink) Old 02-17-2018, 08:15 PM
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Join Date: Jun 2013
Location: California
Own a Commander?: Yes
Model year: 2006
Trim Package: Limited
Power-Train: 5.7L V-8 Hemi
4WD
If 4WD - system: QD-II
Current Mileage: 175,000
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Garage
The thermostat ring does hold pressure and works just fine as a gasket. However, the nature of HOAT coolant means it'll slowly eat away at any rubbers, like the thermostat ring, and you may eventually get seepage. The last thermostat I pulled out of mine had no solid ring left at all, and seemed to be holding a seal just by nature of the gunk left behind by what was once rubber. When I saw that, I threw a silicone gasket on with the new one just to be safe.

2006 XK Limited, Hemi, QDII
245/70R17 General Grabber AT2s
Ported/Polished Throttle Body
Flowmaster Super 44
Stock Height Again (For Now)
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post #10 of 12 (permalink) Old 02-17-2018, 08:17 PM
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Join Date: Jun 2013
Location: California
Own a Commander?: Yes
Model year: 2006
Trim Package: Limited
Power-Train: 5.7L V-8 Hemi
4WD
If 4WD - system: QD-II
Current Mileage: 175,000
Posts: 479
Garage
I can't imagine you'd have any drawbacks to running a silicone bead outside the rubber gasket. I've seen HOAT coolant eat through rubber gaskets, so I think the extra protection might be useful.

2006 XK Limited, Hemi, QDII
245/70R17 General Grabber AT2s
Ported/Polished Throttle Body
Flowmaster Super 44
Stock Height Again (For Now)
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