Radiator Water Flow Problems

[Green Mesa XJ]

That is the place. These cylinder heads i am using heads are 85-95 2.8 to 3.4 heads.

 

 

 

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[AMC86Kid]

Ok so I can get a temp sensor and screw it in that's not a problem but how does the temp gauge in the dash work or how can I install a new one to the sensors I have 

 

do you think I should start a new post on "86 temp dash gauge how does it work" 

[Green Mesa XJ]

Not sure what you mean. If you have a sensor for the gauge package, you should just need to hook that one red wire to it. They are dead simple, just oddball part # because the 2.8 is oddball for jeep and Chevy before the changes in 1987.

 

The early coolant sensor for the cluster 2.8 and 4.0 (2.5??? Not sure) are in the drivers side of the cylinder head, one wire connection with the engine acting as ground. Later 4.0 XJ (1996 up) move to one sensor in the thermostats housing with the OBD II computer feeding data for the gauges.

 

I think you are close to getting it working, if the parts numbers I gave are worth anything, which I'm not 100% they are. I know the aftermarket parts especially for small parts have been off for that jeep for the 20 years I've had it.

 

This fiero group has a chart that should work for testing the sender outside the engine

http://www.gafiero.org/bbs/index.php?topic=641.0

 

 

far as creating a temp switch combination for the electric fan I'm not sure all the steps for that. It's going to be a separate wiring job because the 2.8 harness will not have a plug and play solution since it was a mechanical fan. The s10 forums will probably have the answer. But the correct sender in the intake like you've been doing will probably be the key for that. Probably a kit for it someplace.

  Edit : here is one solution for the electric fan, he used a generic kit Hayden 3647

 http://www.s10forum.com/forum/#/topics/495062

 

Edit: seems Hayden's quality has slipped jegs kit 10560 is probably a better choice.

 

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[Green Mesa XJ]

BTW if that sensor you bought is a alternative for 213-80 it should thread into that spot on the cylinder head.

A guy with a firebird had the same trouble finding that sensor said it was replaced by gm 8993146, used in a lot of gm motors 78-late 80's.

 

You might also look up 78 Camaro 5.0 temperature sensors for some other possibilities. Unfortunately I don't see threading size listed online.

 

If all else fails maybe try a beck arnley 158-0536, it's a new style two prong sensor with plug pigtail. So should just need to wire up the hot side of it since it's already grounded. It'll be a kluge fix but...

 

 

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[AMC86Kid]

ok so i connected an ohm meter to the new sensor and its telling me around 1580 ohms which is around 100 degrees 

so my sensor is working properly but my gauge is not 

when you say "one wire connection with the engine acting as ground"

do you mean that the gauge is connect to the engine and the red wire to the sensor 

that might be my problem i may not have my engine grounded properly

i have the negative terminal connected to the engine from the battery but shouldn't i have some wire from the firewall connected to my engine 

do you know which one or what color wire should be grounded to the engine

if the gauge works on resistance from the sensor i have to have it connected by at least two wires 

so far i can only confirm that the red wire is connect I'm not 100 percent sure on how its grounded to the motor 

[Green Mesa XJ]

There should be a grounding strap to the firewall. They usually rot out long before now, can cause some trouble but I wouldn't necessarily think that why the gauge isn't working. Plenty of choices for replacements.

If the sender is in the cylinder head it should share the ground.
Maybe the wire is bad, but seemed to send a signal when it was hooked up wrong.Or the sensor is bad /wrong. Not sure.




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[AMC86Kid]

ok i have started a new post since this is a new topic maybe someone else can help us 

 

https://comancheclub.com/forums/topic/53897-1986-28-water-temp-gauge/

 

[Marine1Texas]

Yes 20% coolant and 80% water is what I meant