1990 xj Aux fan relay location

Jetfixr320 · Jun 8, 2010

I have a 1990 XJ 4.0L,

My Aux cooling fan doesn't come on either with the A/C on or when the temp climbs. It over heated last week while Idling.

So, my fan clutch may be bad also?

My Power distribution panel doesn't have a cover and its not marked.

Does anyone have a picture with the relays marked?

Thanks,
Jet

89xj · Jun 8, 2010

starting from the front of the relay center:

oxygen sensor heater relay
fuel pump relay
power latch relay
a/c clutch relay

the temp sender for the aux fan is located on the side of the radiator.

fan relay is on drivers side fender wall.

check out this site for info www.lunghd.com or go directly to aux fan trouble shooting http://www.lunghd.com/Tech_Articles/Cooling/Electric_Fan_Diagnosis.htm

ehall · Jun 8, 2010

FYI on PDC covers, they changed fairly often. If you get one from a junkyard make sure it's the same year.

Also you might check the owner's manual, I believe there is a PDC layout diagram there

Jetfixr320 · Jun 8, 2010

Thanks for the info. I will check it out.

Jet

ParadiseXJ · Jun 10, 2010

There is no PDC, per se, on a 90. There is a relay center:

...and you rally should grab a cover for it at the JY, they're laying around all over at the JY here.

The aux fan relay (the one that powers the fan when you're hot) is on the driver's side fender, just behind the vacuum operated EGR solenoid, not to be confused with the A/C clutch relay in the "relay center". They may send signals to each other but they're not the same (in my experience).

joe_peters · Jun 10, 2010

ParadiseXJ said:
There is no PDC, per se, on a 90. There is a relay center:

...and you rally should grab a cover for it at the JY, they're laying around all over at the JY here.

The aux fan relay (the one that powers the fan when you're hot) is on the driver's side fender, just behind the vacuum operated EGR solenoid, not to be confused with the A/C clutch relay in the "relay center". They may send signals to each other but they're not the same (in my experience).

And as this doesn't match 89xj's explanation, and the FI training manual and FSM all seem to have vague references, you may have to do a little testing to be sure of the layout.

cruiser54 · Jun 11, 2010

joe_peters said:
And as this doesn't match 89xj's explanation, and the FI training manual and FSM all seem to have vague references, you may have to do a little testing to be sure of the layout.

Yeah, that description is bass-ackwards to the diagram.

cruiser54 · Jun 11, 2010

joe_peters said:
And as this doesn't match 89xj's explanation, and the FI training manual and FSM all seem to have vague references, you may have to do a little testing to be sure of the layout.

Curiousity got the best of me. Went outside and pulled the 3rd relay back, shown as fuel pump relay in the diagram, and my 90 MJ started right up................

ehall · Jun 11, 2010

they changed that stuff very often... look at fuse boxes sometime

1990 xj Aux fan relay location

Jetfixr320

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89xj

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ehall

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Jetfixr320

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ParadiseXJ

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ehall

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