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18-06-2018
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Lowranger Shocker
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Join Date: Apr 2007
Location: Dracula's next door neighbor
Age: 35
Posts: 1,609 What Jeep do I drive?: WJ
Likes: 93
Liked 231 Times in 188 Posts
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Temperatures in low range
Hi guys,
It was due time for a head scratcher.
Usually when going offroad in low range, my temperature stays solid at 88-90*C unless going up a really really steep climb, with passengers or snow/mud.
This weekend the temperature crept up to 100*C on two climbs, where it stayed until finishing the climb.
I unplugged the coolant temperature sensor to check that the fan is still alive, the fan turned full speed.
Next slope, close to the same difficulty as the others, temperature was again stuck between 88-90*C.
Final slope, it went to 100*C again.
Why did it run cool once? Thermostat sticking closed? Fan solenoid failing to run at low requested fan speeds?
__________________
Quote:
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Originally Posted by Barefoot
Hey I wonder what happens if I plug this wire in therAAAAAGGGGGGHHHH............
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18-06-2018
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Lowranger Shocker
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Join Date: Jul 2017
Location: SE Qld
Posts: 1,510 What Jeep do I drive?: WG
Likes: 172
Liked 273 Times in 220 Posts
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I won't try to explain, but mine does the same. (Diesel). It sometimes just decides to run hotter or cooler than usual, but it's never overheated.
Has me baffled.
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18-06-2018
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Established Member
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Join Date: Apr 2016
Posts: 139 What Jeep do I drive?: WG
Likes: 36
Liked 19 Times in 19 Posts
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Probably no help but does the same as yours. Never goes over about 90 unless on a long climb , hit 100 and stays there. Only time I've ever heard the fan run.
Sent from my ZTE T84 using Tapatalk
__________________
03 WG grand CRD Overland. (written off)
05 KJ cherokee crd extreem sport (current)
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18-06-2018
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Lowranger Shocker
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Join Date: Jul 2017
Location: SE Qld
Posts: 1,510 What Jeep do I drive?: WG
Likes: 172
Liked 273 Times in 220 Posts
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Quote:
Originally Posted by Ben-n-Jo
Only time I've ever heard the fan run.
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Same
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18-06-2018
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Lowranger Shocker
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Join Date: Apr 2007
Location: Dracula's next door neighbor
Age: 35
Posts: 1,609 What Jeep do I drive?: WJ
Likes: 93
Liked 231 Times in 188 Posts
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I can hear it run a low speed when it's hot outside, idling with the A/C on, this is when the fan PWM goes over 19%.
When the coolant temperature reached 100*C it ramped up to 21% if I remember correctly and that's how it kept it at 100*C.
Cheers for the information! One less thing to worry about in this case 
__________________
Quote:
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Originally Posted by Barefoot
Hey I wonder what happens if I plug this wire in therAAAAAGGGGGGHHHH............
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19-06-2018
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Rock Munki
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Join Date: Aug 2009
Location: Castle Hill, NSW
Posts: 2,136 What Jeep do I drive?: WG
Likes: 11
Liked 300 Times in 245 Posts
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Mine will run at 100c when pushing soft sand on the beach. It never goes past there and other vehicles I've driven in the same environment have done the same.
Probably a normal thing, you don't need to worry about.
Jason
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20-06-2018
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Lowranger Shocker
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Join Date: Jul 2017
Location: SE Qld
Posts: 1,510 What Jeep do I drive?: WG
Likes: 172
Liked 273 Times in 220 Posts
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I'm seeing a clear trend here. Don't worry, I found this unnerving too.
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