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sprinkles08, ASE Certified Technician
Category: Jeep
Satisfied Customers: 22663
Experience:  Chrysler/Dodge/Jeep Master Certified, ASE Master and Advanced Certified, Trans and Hybrid Specialist
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Grand Cherokee: F20 keeps blowing. Seems to be related to AC

Customer Question

F20 keeps blowing. Seems to be related to AC but the ultimate outcome is the radiator cooling fan won't turn on and engine overheats
Submitted: 2 years ago.
Category: Jeep
Expert:  sprinkles08 replied 2 years ago.
Hello and welcome to JustAnswer!
Fuse 20 in the junction block powers a handful of components. The problem could be a short to ground in the wiring between the fuse and any of the components, or it could be high current draw in one of the components. First try to determine if the problem happens only when using a certain component. If you aren't able to determine if it's a component then you may have to break the circuit up with inline fuses to see which leg of the circuit the short is on and then concentrate in that area. A visual and wiggle test of the associated wiring may reveal an issue also.
This fuse powers the a/c control head, transmission range sensor, backup lamp relay, the heated seat switches, and the cooling fan relays.