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Unread 03-06-2007, 01:41 PM   #1
wjs81866
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5.9 Cooling - Upper & Lower rad hose electrical?

What do the fittings on the upper and lower radiator hose do; they have what looks like a temp sensor w/ wires coming out of them.

Anyone know what these do? Control the fan? How would you know if they were not functioning or functioning poorly?

Parts stores don't even list them.

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Unread 03-06-2007, 03:54 PM   #2
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bump to the top
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1) 2011 Grand Cherokee LImited
Blackberry Pearl
5.7L
Quadra Trac 2
Lux Group 2
20" tires and rims
Towing package

2) 2011 Grand Cherokee Laredo X
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5.7L
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Quadra Lift
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Off-Road Adventure II Package
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Unread 03-06-2007, 03:56 PM   #3
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Any pics? I'm not sure what you are talking about.
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Unread 03-06-2007, 03:59 PM   #4
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They are thermoswitches that open and close electrically according to coolant temps. Not sure what each one does, but the efan is 2-speed, so it makes sense one turns on low, and the other high.

I guess you would run hot or overheat if they failed. You could pull them off and test them in a pan of boiling water with an ohmmeter and a thermometer to see how they act.
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Unread 03-06-2007, 04:30 PM   #5
SJZ
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Quote:
Originally Posted by wjs81866
What do the fittings on the upper and lower radiator hose do; they have what looks like a temp sensor w/ wires coming out of them.

Anyone know what these do? Control the fan? How would you know if they were not functioning or functioning poorly?

Parts stores don't even list them.
Here is the logic:
fanops.jpg  
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