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Unread 07-09-2011, 09:32 PM   #1
pennyduke
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1998 ZJ 
 
Join Date: Aug 2007
Location: Va
Posts: 6
Temp Switch Sender/Coolant Temp Sensor

Can anyone show me where these 2 sensors or senders are on a 1996 ZJ 4.0L. I read that one of them has 2 wires and the other is has 1 wire. I have one on the T-Stat housing and one on the intake manifold. They look the same but have different part numbers. Im replacing everything to do with the cooling system one part at a time until it quits overheating.Thanks

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Unread 07-09-2011, 09:35 PM   #2
TheHalfWit
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1995 ZJ 
 
Join Date: Jan 2011
Location: Alexandria, Virginia
Posts: 695
Since yours is a 96 you should only have 1 sender. The 96-98 had the gauge ran by the pcm with no need for a second sender.

The one on the thermostat should be the only coolant temperature sender you have. The 93-95 4.0's had a second sender on the very back of the block, under the wiring for the injectors, 3" from the firewall and a ***** to change.
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Unread 07-09-2011, 10:03 PM   #3
pennyduke
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1998 ZJ 
 
Join Date: Aug 2007
Location: Va
Posts: 6
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The parts store gave me 2 numbers for the 1996. Coolant Temp Sensor (WT3027Z) and a Temp Switch/Sender (WT428P). They both look just like the one on the Intake. Im pretty sure no coolant flows through the Intake.
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Unread 07-09-2011, 11:08 PM   #4
TheHalfWit
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1995 ZJ 
 
Join Date: Jan 2011
Location: Alexandria, Virginia
Posts: 695
That sounds like the IAT, what you want is the sensor that plugs into the side of the thermostat housing/water outlet.
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