[97 XJ] radiator cooling fan problem

this is not for my jeep, but a friend's '97 XJ

yesterday, one of the cooling fans on the radiator (the one on the
driver's side) would continue to run after the vehicle was shut off. i
guess that in itself is not so strange, my VW Jetta will continue to run
the fan for a few minutes when it is really hot out, as it will continue
to run the coolant through the engine if it is hot out. but, i am in
maryland, and it is the dead of winter. and the fan didn't shut off, it
ran until the battery died. so he got a jump so he could get to work
today, and when he turned the engine off, the fan would continue to run. i
disconnected the battery so that it wouldn't die. 8 hours later when we
got off work, when i hooked the battery up again, the fan immediately
turned back on. i checked the fuse box in the engine bay, and noticed that
one of the relays in there was for the cooling fans. so with the battery
disconnected again, i pulled out (what i thought was) the relay for the
cooling fans, inspected it (it looked fine) and put it back in. i later
realized that i had actually pulled the relay marked 'ASD', which
according to the manual, is for the 'Auto Shutdown.' but, for whatever
reason, the simple act of pulling out and reinserting the 'ASD' relay
fixed the problem, or at the very least, fixed it for the time being.

can anyone give me any insight into what exactly happened here? is the
'auto shutdown' relay for the circuity that turns that fan on and off?
(the fan on the passenger side appears to always run, while the one on the
driver side appears to run only when needed).

erik
'78 jeep CJ7, mostly stock

Next time just unplug the elec. cooling fan the connector sits right there
at the top outside corner of the fan housing.

Sounds to me like a relay is sticking.. the ASD relay will do just that
shut everything down. double check the connections on the fan relays ( IIRC
the ac relay is the same).

Snow...

"Erik Sabowski" > wrote in message
news
> this is not for my jeep, but a friend's '97 XJ
>
> yesterday, one of the cooling fans on the radiator (the one on the
> driver's side) would continue to run after the vehicle was shut off. i
> guess that in itself is not so strange, my VW Jetta will continue to run
> the fan for a few minutes when it is really hot out, as it will continue
> to run the coolant through the engine if it is hot out. but, i am in
> maryland, and it is the dead of winter. and the fan didn't shut off, it
> ran until the battery died. so he got a jump so he could get to work
> today, and when he turned the engine off, the fan would continue to run. i
> disconnected the battery so that it wouldn't die. 8 hours later when we
> got off work, when i hooked the battery up again, the fan immediately
> turned back on. i checked the fuse box in the engine bay, and noticed that
> one of the relays in there was for the cooling fans. so with the battery
> disconnected again, i pulled out (what i thought was) the relay for the
> cooling fans, inspected it (it looked fine) and put it back in. i later
> realized that i had actually pulled the relay marked 'ASD', which
> according to the manual, is for the 'Auto Shutdown.' but, for whatever
> reason, the simple act of pulling out and reinserting the 'ASD' relay
> fixed the problem, or at the very least, fixed it for the time being.
>
> can anyone give me any insight into what exactly happened here? is the
> 'auto shutdown' relay for the circuity that turns that fan on and off?
> (the fan on the passenger side appears to always run, while the one on the
> driver side appears to run only when needed).
>
> erik
> '78 jeep CJ7, mostly stock

unplug the sensor on the t-stat housing ( if it's there)while the fan is
running if it shuts off the temp sensor is bad
if the sensor is not there it's on the side of the rocker cover in the bac and
it's a one wire connector

Erik Sabowski wrote:

> this is not for my jeep, but a friend's '97 XJ
>
> yesterday, one of the cooling fans on the radiator (the one on the
> driver's side) would continue to run after the vehicle was shut off. i
> guess that in itself is not so strange, my VW Jetta will continue to run
> the fan for a few minutes when it is really hot out, as it will continue
> to run the coolant through the engine if it is hot out. but, i am in
> maryland, and it is the dead of winter. and the fan didn't shut off, it
> ran until the battery died. so he got a jump so he could get to work
> today, and when he turned the engine off, the fan would continue to run. i
> disconnected the battery so that it wouldn't die. 8 hours later when we
> got off work, when i hooked the battery up again, the fan immediately
> turned back on. i checked the fuse box in the engine bay, and noticed that
> one of the relays in there was for the cooling fans. so with the battery
> disconnected again, i pulled out (what i thought was) the relay for the
> cooling fans, inspected it (it looked fine) and put it back in. i later
> realized that i had actually pulled the relay marked 'ASD', which
> according to the manual, is for the 'Auto Shutdown.' but, for whatever
> reason, the simple act of pulling out and reinserting the 'ASD' relay
> fixed the problem, or at the very least, fixed it for the time being.
>
> can anyone give me any insight into what exactly happened here? is the
> 'auto shutdown' relay for the circuity that turns that fan on and off?
> (the fan on the passenger side appears to always run, while the one on the
> driver side appears to run only when needed).
>
> erik
> '78 jeep CJ7, mostly stock

I still don't know why you 'pretend' to be a mechanic...

The sensor on the back of the head is for the gauge only and nobody puts
a freaking sensor on the side of a rocker cover.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

mic canic wrote:
>
> unplug the sensor on the t-stat housing ( if it's there)while the fan is
> running if it shuts off the temp sensor is bad
> if the sensor is not there it's on the side of the rocker cover in the bac and
> it's a one wire connector
>
> Erik Sabowski wrote:
>
> > this is not for my jeep, but a friend's '97 XJ
> >
> > yesterday, one of the cooling fans on the radiator (the one on the
> > driver's side) would continue to run after the vehicle was shut off. i
> > guess that in itself is not so strange, my VW Jetta will continue to run
> > the fan for a few minutes when it is really hot out, as it will continue
> > to run the coolant through the engine if it is hot out. but, i am in
> > maryland, and it is the dead of winter. and the fan didn't shut off, it
> > ran until the battery died. so he got a jump so he could get to work
> > today, and when he turned the engine off, the fan would continue to run. i
> > disconnected the battery so that it wouldn't die. 8 hours later when we
> > got off work, when i hooked the battery up again, the fan immediately
> > turned back on. i checked the fuse box in the engine bay, and noticed that
> > one of the relays in there was for the cooling fans. so with the battery
> > disconnected again, i pulled out (what i thought was) the relay for the
> > cooling fans, inspected it (it looked fine) and put it back in. i later
> > realized that i had actually pulled the relay marked 'ASD', which
> > according to the manual, is for the 'Auto Shutdown.' but, for whatever
> > reason, the simple act of pulling out and reinserting the 'ASD' relay
> > fixed the problem, or at the very least, fixed it for the time being.
> >
> > can anyone give me any insight into what exactly happened here? is the
> > 'auto shutdown' relay for the circuity that turns that fan on and off?
> > (the fan on the passenger side appears to always run, while the one on the
> > driver side appears to run only when needed).
> >
> > erik
> > '78 jeep CJ7, mostly stock

oops sorry god i slipped how dare me

Mike Romain wrote:

> I still don't know why you 'pretend' to be a mechanic...
>
> The sensor on the back of the head is for the gauge only and nobody puts
> a freaking sensor on the side of a rocker cover.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> mic canic wrote:
> >
> > unplug the sensor on the t-stat housing ( if it's there)while the fan is
> > running if it shuts off the temp sensor is bad
> > if the sensor is not there it's on the side of the rocker cover in the bac and
> > it's a one wire connector
> >
> > Erik Sabowski wrote:
> >
> > > this is not for my jeep, but a friend's '97 XJ
> > >
> > > yesterday, one of the cooling fans on the radiator (the one on the
> > > driver's side) would continue to run after the vehicle was shut off. i
> > > guess that in itself is not so strange, my VW Jetta will continue to run
> > > the fan for a few minutes when it is really hot out, as it will continue
> > > to run the coolant through the engine if it is hot out. but, i am in
> > > maryland, and it is the dead of winter. and the fan didn't shut off, it
> > > ran until the battery died. so he got a jump so he could get to work
> > > today, and when he turned the engine off, the fan would continue to run. i
> > > disconnected the battery so that it wouldn't die. 8 hours later when we
> > > got off work, when i hooked the battery up again, the fan immediately
> > > turned back on. i checked the fuse box in the engine bay, and noticed that
> > > one of the relays in there was for the cooling fans. so with the battery
> > > disconnected again, i pulled out (what i thought was) the relay for the
> > > cooling fans, inspected it (it looked fine) and put it back in. i later
> > > realized that i had actually pulled the relay marked 'ASD', which
> > > according to the manual, is for the 'Auto Shutdown.' but, for whatever
> > > reason, the simple act of pulling out and reinserting the 'ASD' relay
> > > fixed the problem, or at the very least, fixed it for the time being.
> > >
> > > can anyone give me any insight into what exactly happened here? is the
> > > 'auto shutdown' relay for the circuity that turns that fan on and off?
> > > (the fan on the passenger side appears to always run, while the one on the
> > > driver side appears to run only when needed).
> > >
> > > erik
> > > '78 jeep CJ7, mostly stock