heater doesn’t blow on high setting

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Nov 25, 2019 | 06:43 AM

rockymtnxj

Thread Starter

Newbie

Joined: May 2019

Posts: 11

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From: Northern Colorado

Year: 1996

Model: Cherokee (XJ)

Engine: 4.0

heater doesn’t blow on high setting

96 xj classic. the high setting has worked all year with the ac and heat but just this week the high setting won’t turn on. thoughts?

Nov 25, 2019 | 11:18 AM

PatHenry

CF Veteran

Joined: Nov 2017

Posts: 3,700

Likes: 238

From: Groton, MA

Year: 1995

Model: Cherokee(XJ)

Engine: I6 4.0L

I would think it's got to be the switch if it's only the HIGH setting but the other settings are working.

Nov 25, 2019 | 11:38 AM

dave1123

Old fart with a wrench

Joined: Nov 2010

Posts: 14,398

Likes: 741

From: Manlius, east of Syracuse, NY

Year: 2000 XJ Sport & WJ Laredo

Model: Grand Cherokee (WJ)

Engine: 4.0L

PatHenry has it right, although it could be the high speed tap on the resistor. The fan motor is hot-wired and the resistor taps form the ground paths thru various positions of the speed selector switch. Sometimes the high amp draw melts the resistor connector causing loss of different speeds.

Nov 25, 2019 | 03:36 PM

awg

CF Veteran

Joined: Mar 2016

Posts: 3,816

Likes: 725

Year: 96

Model: Cherokee (XJ)

Engine: 4.0

Quote:

Originally Posted by rockymtnxj

96 xj classic. the high setting has worked all year with the ac and heat but just this week the high setting won’t turn on. thoughts?

Examine the wiring junction at the resistor pack..the terminals get corroded..one for each speed

'96 have a very bad design for fan power, all goes thru all switches and wires. I intend to relay them out