4wd temporary unavailable overheated? - Page 3 - 2014+ Jeep Cherokee Forums
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post #21 of 48 (permalink) Old 03-14-2017, 09:06 PM
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post #22 of 48 (permalink) Old 03-14-2017, 10:18 PM
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When mine says overheated 4wd temp unavailable nothing I can do short of waiting half an hour. When in sand with no 4wd you go nowhere... Turn it off and sit a few minutes then restart, if in low range the message comes up instantly and if in high it comes on if you try to engage sand or mud or low range.

Last time I had been on low range in soft sand for around 30min and upon exiting the beach it would not let me out of low range. Kept flashing the message every time I tried. 1/2 hour later after airing up the tyres and chatting it finally had cooled enough to let me disengage low range and drive off. Bloody annoying.

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post #23 of 48 (permalink) Old 03-14-2017, 10:21 PM
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Kind of sad that you can overheat the 4WD in snow...........lol

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post #24 of 48 (permalink) Old 03-14-2017, 10:22 PM
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2014s and 2015s are far less tolerant on the 4wd overheating than the 2016s. My 2014 would overheat all the time. My 2016 has only done it while I was towing my travel trailer through snow.


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post #25 of 48 (permalink) Old 03-14-2017, 10:57 PM
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Kind of sad that you can overheat the 4WD in snow...........lol
Heh. Remove skid plates for conduction cooling lol.

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post #26 of 48 (permalink) Old 03-15-2017, 12:43 AM
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I believe, could be wrong, that the overheating causing the 4wd unavailable message is the clutch pack in the rear diff unit that provides the necessary slip for am all wheel drive scenario on hard ground. When on slippery ground the constantly slipping front or rear wheels is allowingor promoting slippage in the clutches and therfore generating heat. It would be nice since the computers obviously monitors the temp to be able to display it to know in advance if overheating is likely.

If this is the case then I am surprised in snow as it does not have a shield. Though possibly the front shields are lower than the diff so it's always sitting above the snow and not dragging through it.

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Cheers, Dave.


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post #27 of 48 (permalink) Old 03-15-2017, 02:03 AM
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Quote:
Originally Posted by David_Baker View Post
I believe, could be wrong, that the overheating causing the 4wd unavailable message is the clutch pack in the rear diff unit that provides the necessary slip for am all wheel drive scenario on hard ground. When on slippery ground the constantly slipping front or rear wheels is allowingor promoting slippage in the clutches and therfore generating heat. It would be nice since the computers obviously monitors the temp to be able to display it to know in advance if overheating is likely.

If this is the case then I am surprised in snow as it does not have a shield. Though possibly the front shields are lower than the diff so it's always sitting above the snow and not dragging through it.

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You are right, I think in my case it was the clutches overheating, which based on how bad I was thrashing my TH in the deep snow not totally unexpected, now since there is a warning in the system for this, maybe there is a way to get a temperature reading through a scanguage?

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post #28 of 48 (permalink) Old 03-15-2017, 05:19 AM
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I belive one of the guage makers has been working on it and may have the readout. But why can I read engine coolant, transmission fluid plus a guage for oil temp right on the dash but not the thing that twice has made me sit in soft sand bogged with a rising tide!

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Cheers, Dave.


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post #29 of 48 (permalink) Old 03-15-2017, 11:28 AM
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Quote:
Originally Posted by David_Baker View Post
I believe, could be wrong, that the overheating causing the 4wd unavailable message is the clutch pack in the rear diff unit that provides the necessary slip for am all wheel drive scenario on hard ground. When on slippery ground the constantly slipping front or rear wheels is allowingor promoting slippage in the clutches and therfore generating heat. It would be nice since the computers obviously monitors the temp to be able to display it to know in advance if overheating is likely.

If this is the case then I am surprised in snow as it does not have a shield. Though possibly the front shields are lower than the diff so it's always sitting above the snow and not dragging through it.

Sent via Tapatalk from a small keyboard on my phone with fat thumbs and no glasses...
You are 100% correct. When the rear drive shaft engages, the front clutches in the wet pack begin to spin which heats up the goo inside and engages the rear clutches, which then spin the rear differential, and thus the rear wheels. Depending on how much tire slippage is occurring, front to back, side to side, makes this clutch pack work harder to stay engaged. Once the clutch pack reaches a certain temperature, it disengages and thus the message. When I finally found out how this system works, I was highly disappointed. I can't believe that Jeep would use one of these. In a Jeep, it needs to be a mechanical connection; not a wet one. Jeep is known for its off road prowness; this is why Jeep sells more SUVs then anyone else.

A few years back, Car and Driver did a test of a bunch of 3 row SUVs. They ended up at the sand dunes of Western Michigan. They tested a Durango (mechanical connection) against a bunch of what were basically FWD (Explorer, Honda Pilot, one of the GMs; I don't remember all of them). All off these had a wet pack clutch unit which would send power to the rear wheels. All of them overheated, so 4WD was not available and the Durango had to pull them out as each one of them got stuck in the sand. Sad.

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Last edited by dhh3; 03-15-2017 at 11:30 AM.
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post #30 of 48 (permalink) Old 03-15-2017, 11:33 AM
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Originally Posted by David_Baker View Post
I belive one of the guage makers has been working on it and may have the readout. But why can I read engine coolant, transmission fluid plus a guage for oil temp right on the dash but not the thing that twice has made me sit in soft sand bogged with a rising tide!

Sent via Tapatalk from a small keyboard on my phone with fat thumbs and no glasses...
I know this veers off topic, but it would be nice to know oil pressure, too. All I have is the dumb oil temperature graph with no numbers.

Back on topic, it would definitely be nice if they provided the temp of this RDM or whatever that forces one to stop in their tracks. We've basically got an idiot light for that.

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