Overheats Going into the Mountains - Page 4 - Jeep Commander Forums: Jeep Commander Forum
Problems / Dealer Service Having a problem with your vehicle? Were you treated fairly or poorly at a dealer? Warranty issues? Let us know.

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post #31 of 42 (permalink) Old 08-01-2019, 07:16 PM
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here's your parts list if you REALLY want a mechanical fan


https://parts.moparonlineparts.com/a...oling-fan-scat
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post #32 of 42 (permalink) Old 08-01-2019, 07:30 PM Thread Starter
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Quote:
Originally Posted by Legofan View Post
LOL, yes, yes it is most definitely for cooling the engine and you'll find in almost every search that the only cooling option for the 4.7 is indeed the electric fan.
To be fair, I bet v8 XKs without a tow package are as rare as sunroof-less ones.

Either way, it's not enough for high altitude hills at 90F.
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post #33 of 42 (permalink) Old 08-03-2019, 11:36 AM Thread Starter
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Confirmed with a block tester I do NOT have a HG leak.

Yay!!
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post #34 of 42 (permalink) Old 08-03-2019, 05:28 PM
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Join Date: Jun 2006
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Quote:
Originally Posted by Aerogt01 View Post
Confirmed with a block tester I do NOT have a HG leak.

Yay!!
That's good news!

2006 Steel Blue 5.7L HEMI Limited 4x4 Build Date: June 9, 2006 Hour 14
Interior: Dark Slate/Light Graystone with Saddle Brown Leather Seats
Quadra-Drive II, NAV, DVD, Trailer Tow Group IV, Off-Road Group II, Remote Start, UConnect, Rear Backup Camera, Chrome Wheels,
Magnaflow cat-back exhaust, Daytime Running Lights enabled, 2" Rough Country Lift with 265/70R17 Goodyear Wrangler AT/S
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post #35 of 42 (permalink) Old 08-03-2019, 09:03 PM
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Quote:
Originally Posted by Aerogt01 View Post
To be fair, I bet v8 XKs without a tow package are as rare as sunroof-less ones.

Either way, it's not enough for high altitude hills at 90F.
Maybe I should call Big Blue the Big Blue Unicorn.......she has no sunroofs or tow package when I picked her up.

I had to install my own hitch & trailer wiring harness.


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post #36 of 42 (permalink) Old 08-05-2019, 12:29 AM Thread Starter
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Update for anyone still here:

I took Saturday afternoon to clean out the cooling system using the Zerex Super Flush product. I didn't really get anything out, but the product foamed like crazy, meaning it definitely was doing something.

If there's one important bit of information I learned, it is this: The heater cores on the XK and their hoses hold about two gallons themselves. I'm serious.
You CANNOT perform a proper flush without disconnecting or cutting one of the hoses and flushing those out separately. There's a long version to that story, but just don't try to be the smart one like I did and save yourself 2-3 hrs.

Otherwise, new rad cap and thermostat. Flushed the outside of the radiator from all angles. Rad flowed water REALLY well internally when flushing it. Temps were good throughout the day of hot traffic today. I did also clean all the "gunk" off of the bleeder screw thinking it was a good idea at the time. Apparently this gunk was actually sealing it. I'll need to pick up some thread sealant from NAPA on the way home from work tomorrow as it is currently weeping. I am however, going to order the fan and clutch and install it before our next mountain voyage. I'm confident this plus the flush will solve my issue.

Thanks again, guys!
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post #37 of 42 (permalink) Old 08-05-2019, 12:43 AM Thread Starter
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Quote:
Originally Posted by Big Blue View Post
Maybe I should call Big Blue the Big Blue Unicorn.......she has no sunroofs or tow package when I picked her up.

I had to install my own hitch & trailer wiring harness.
Right there with ya, Blue. I thought I got the short end of the stick at first for not having a sunroof.

But the people that did my hitch and wiring did a horrific job of it. Will probably fix that and put a 7-pin on if I ever get around to a steel bumper...
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post #38 of 42 (permalink) Old 08-05-2019, 03:01 AM
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Quote:
Originally Posted by Aerogt01 View Post
Right there with ya, Blue. I thought I got the short end of the stick at first for not having a sunroof.

But the people that did my hitch and wiring did a horrific job of it. Will probably fix that and put a 7-pin on if I ever get around to a steel bumper...
I had my Class III Reese Hitch put in at U-Haul, they did a pretty good job.


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post #39 of 42 (permalink) Old 08-05-2019, 12:01 PM
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Join Date: Jun 2014
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Quote:
Originally Posted by Spraygun View Post
Okay here you go. Someone else could have taken that fan and clutch off to give themselves more horsepower.
But it takes a much larger radiator and dual electric fans to provide engine cooling.
I cannot find any evidence on any of the Commander engines without a mechanical fan.
I think the lack of mechanical fan pretty much solves this, but I just want to chime in here so there isn't any miss-information floating around.
The Hemi engines don't have a mechanical or electric fan. They have a hydraulic fan that's driven off the power steering pump. It has an electronic controlled valve in it to control the fan speed based on cooling needs.

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Need to get it on a dyno....
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post #40 of 42 (permalink) Old 08-05-2019, 02:35 PM
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Join Date: Jun 2014
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Quote:
Originally Posted by Wombler View Post
I think the lack of mechanical fan pretty much solves this, but I just want to chime in here so there isn't any miss-information floating around.
The Hemi engines don't have a mechanical or electric fan. They have a hydraulic fan that's driven off the power steering pump. It has an electronic controlled valve in it to control the fan speed based on cooling needs.
I was referring to his particular 4.7 L.
A four-by-four moving all that metal down the road.
Better have plenty of cooling power.
And hydraulic technology requires machinery of some kind, to move the fluid or air,if if it was pneumatic. So I just used the term mechanical fan. Sorry if I misled anyone.

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