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Unread 02-27-2014, 05:13 PM   #1
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Join Date: Feb 2014
Location: Plano, Texas
Posts: 1
Heater control unit malfunction

Hi, i had to replace my heater control unit recently and during the install i heard a hissing sound and when i'd finished the fans wont turn on which wasn't a problem before.
Does anyone know how to fix it or whats wrong

shadowonawall is offline   Reply With Quote
Unread 02-27-2014, 05:15 PM   #2
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1998 ZJ 
Join Date: Aug 2011
Location: The Abyss, MD
Posts: 15,094
Check fuses. No burning smell right?
1998 5.9
Originally Posted by jabba974
"And yes, there is always a torque spec...but its not necessary...and takes way to much time...."
PolkaPower is offline   Reply With Quote
Unread 02-27-2014, 05:39 PM   #3
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1998 ZJ 
Join Date: Jul 2013
Location: elizabethton, tn
Posts: 487
Unplug the blower motor resistor connection and look at it and pull the heater/dash harness apart and check it out too.

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