1998 Jeep Grand Cherokee Cooling Fan Inop when AC turned on

1998 JEEP GRAND CHEROKEE
136,000 MILES • V8 • 4WD • AUTOMATIC
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APEGUES
  • MEMBER
  • 2 POSTS
Cooling fan inop when ac switched on, works when engine temp limit hit, all fuses checked good, compressor clutch on, AC pressures sky high-trips hi-press cut out.
Sep 25, 2010 at 12:52 PM
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KHLOW2008
  • ✓Experienced Mechanic
  • 41,812 POSTS
Hi apegues,

Thank you for the donation.

The system uses a 2 speed fan motor and when the A/C is turned on, only the low speed would work.

The high speed cuts in only when the coolant temperature fan switch is activated.

I would sugget testing the cooling fan motor low speed circuit first. Apply fused battery voltage to the cooling fan Dark Green wire. Fan motor should work in low speed.

The other item to check would be the low speed cooling fan relay, located behind the right headlamps. Removal of the grille and bumper is required to get to the relay.
Jul 28, 2019 at 5:07 AM
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APEGUES
  • MEMBER
  • 2 POSTS
Just the info I needed, Got Power in the Dk Green wire to the fan, got a good ground and got a fan that no go.
Looks as though that part of the fan "eeees Broke!"

Thanks for the info
Jul 28, 2019 at 5:07 AM
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KHLOW2008
  • ✓Experienced Mechanic
  • 41,812 POSTS
You're welcome.

Yes, symptom indicates a faulty fan motor which has to be replaced.

Thank you for using 2carpros and have a nice day.
Jul 28, 2019 at 5:07 AM
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