which switch is which?

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Apr 11, 2014 | 06:18 PM

dbest

Thread Starter

Newbie

Joined: Jan 2014

Posts: 5

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Year: 1994

Model: Cherokee

Engine: 4L

which switch is which?

Okay, here’s my dilemma. When I start my ’94 Cherokee the temperature light will light at about 120o. This jeep has a new engine, water pump, hoses, thermostat, distributor, etc. We carefully cleaned and checked everything we reused. If it was in question, we replaced it. I’ve disconnected the harness from the switch and with the key on, grounded it, verifying that the circuit is good. My thinking is that the parts guy gave us a sender rather than the switch, thinking that I would get some diminishing resistance with an increase in temperature. However, after researching it, I am still questioning this guess. Does anybody know the correct Mopar part # for the switch (with indicator lights)?

Apr 11, 2014 | 08:19 PM

timberwolf

Seasoned Member

Joined: Feb 2012

Posts: 307

Likes: 1

From: PA

Year: 1996

Model: Cherokee

Engine: 4.0

this should work:

http://www.autozone.com/autozone/par..._173413_0_5835

you are changing the one at the rear of the engine, not the one by the thermostat, right?

Apr 11, 2014 | 09:27 PM

dbest

Thread Starter

Newbie

Joined: Jan 2014

Posts: 5

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Year: 1994

Model: Cherokee

Engine: 4L

Yes, that's the one that that I'm using. I start getting a signal from it before the thermostat opens. Best estimate is around 119 degrees.

Apr 12, 2014 | 05:22 AM

freegdr

CF Veteran

Joined: Mar 2010

Posts: 47,923

Likes: 38

From: Broward County Fl.

Year: 1989 xj sport 2dr

Model: Cherokee

Engine: 12 hole bosch Injectors

Sounds like you got the sender for a gauge not the light.

Apr 12, 2014 | 09:00 AM

cruiser54

::CF Moderator::

Joined: Aug 2011

Posts: 43,971

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From: Prescott, Az

Year: 1990

Model: Cherokee (XJ)

Engine: 4.0

Quote:

Originally Posted by freegdr

Sounds like you got the sender for a gauge not the light.

I'm betting you're correct, General.

Apr 12, 2014 | 09:54 AM

dbest

Thread Starter

Newbie

Joined: Jan 2014

Posts: 5

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Year: 1994

Model: Cherokee

Engine: 4L

That's what I was guessing too. I went to the switch manufacturer, and they said I had to correct switch. To test all of this, I got the other switch and got the same results (light turning on before thermostat opened). It’s a simple circuit (bulb with normally open switch). So, what else could be causing this? An air pocket in the cooling system would cause the switch to open later, rather than earlier. I’m about stumped.