temp sending units
Thread Starter
Newbie
Joined: Dec 2016
Posts: 4
Likes: 0
From: Commerce Ga
Year: 1988
Model: Comanche (MJ)
Engine: 4.0
temp sending units
I have a 91 Cherokee with the 4.0L. There are two temp sending units on the engine. the single wire unit at the rear of the head is for the light/gauge. What is the front unit for? Is it for the fan only or does it tell the computer when to go into closed loop?
This is my first 4.0L and I'm just trying to learn how the fuel injection works.
This is my first 4.0L and I'm just trying to learn how the fuel injection works.
Senior Member
Joined: Dec 2015
Posts: 935
Likes: 49
From: Nationwide, USA
Year: 89
Model: Cherokee
Engine: Renix 4.0
My understanding is that the fan has it's own thermal switch in the radiator. The coolant temp sensor toward the front of the engine provides temp info for the computer.
CF Veteran
Joined: May 2012
Posts: 7,965
Likes: 964
From: Lost in the wilds of Virginia
Year: 1998 Classic (I'll get it running soon....) and 02 Grand
Model: Cherokee (XJ)
Engine: 4.0