Re: [Amc-list] Jeep Cherokee Heater / radiator questions - core diverter valve failures, electric fan failures...

[Steve Cornelius <steve.c@xxxxxxxxxxxxxx>]

Jerry Casper wrote:
> size ( swelling up, wanted to replace it ). Wondered
> how common a failure this was to the valve, being a
> plastic part.

Pretty common on older XJs. If you got a $24 chinese
valve from the corner auto parts place, it'll hold up
exactly 18 months before leaking at the pivot seal.
The dealer valve costs about $42, and is U.S. made
(Airtex, I suspect).

Guess what's in the trash can in my shop right now ;)


>  The other question is, my electric fan hasn't worked
> for a year, I've noticed that I've had overheating
> problems when i come to a standstill in traffic, but
> moving it's no problem, so I've let it go until now.
> But I really need to fix it. Anyone know where the
> sensor is located on the engine block that turns it on
> and off? I'm going to jumper the fan itself, to make
> sure it isn't bad as well, but wanted to find out
> where that darn sensor was, as the wiring harness is
> all buttoned up, without tearing up alot of harness
> tracing it out. Any help, here? Thanks, 

The temp sensor is threaded into the thermostat
housing, right up front.

I think the ECU does the fan switching based on
sensor input. Can't get to my shop manual at the
moment, but I'll take a peek at the wiring later.
I'm pretty sure it's switched with a relay in the
power distribution block behind the battery
(above the right front wheel well, there is a
fuse/relay map printed under the cover).

If you have factory air, then the fan will come
on with the A/C switched on. That might be a quick
way of verifying the fan itself. Next, check the
relay and see what it's doing; if the coil is
switching, and the current path through the fan
motor is OK, then you found it.

- steve c.


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