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1998 Jeep Laredo Heater blower intermittent

Tiny
EAMONHEGERTY
  • MEMBER
  • 1998 JEEP GRAND CHEROKEE LAREDO
Heater problem
1998 Jeep Laredo Engine Size unknown Four Wheel Drive Automatic 110000 miles

The car is a Grand Cherokee Laredo. The heater blower is intermittent. Sometimes it works, sometimes it doesn't. I bypassed the controls and connected 12V directly to the blower and it worked fine. I've removed the heater/blower control unit from the dashboard but don't see anything obviously wrong with it. There is a clear plastic pipe coming out of the back of the control unit (which I don't understand) as well as normal electrical wiring. What is the likely cause of the intermittent operation?

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Thursday, February 21st, 2008 AT 10:40 PM

2 Replies

Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Most likely the fan speed resistor is shorting out. Should be in the HVAC plenum near the blower motor, just follow the wires from blower back to it
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Friday, February 22nd, 2008 AT 7:29 AM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS


https://www.2carpros.com/forum/automotive_pictures/62217_Switches_1.jpg


Check these two out and you can figure out the cause! Thanks for the donation!
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Friday, February 22nd, 2008 AT 7:33 AM

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