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Old 12-02-2007, 05:52 PM   #1
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R&R heater core?

my 90 k1500 has no heat. I've determined that the heater core needs to be replaced. How difficult is it? I've done it on late model fords and it was very time consuming. If its anything like that I can live with it as is for a bit. If it is a quick job I'm happy to do it. Its a non AC truck, so anybody have some input? Thanks Joe
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89 K2500 Chevy, Wee-Oh-five
285K miles, completly rebuilt
needs a motor, bad

1962 IHC Scout All Wheel Drive
(Scout speak for locking axles)
152 ci, dana everything else
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Old 12-03-2007, 05:13 PM   #2
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anybody? 75?
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Joe

89 K2500 Chevy, Wee-Oh-five
285K miles, completly rebuilt
needs a motor, bad

1962 IHC Scout All Wheel Drive
(Scout speak for locking axles)
152 ci, dana everything else
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Old 12-03-2007, 06:31 PM   #3
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unfortunately i dont have a book but i have a 88 with ac and it looks pretty easyits like over the hump inside behind a few screws and a cover, atleast mine is, hope this help a little
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Old 12-05-2007, 07:28 AM   #4
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If it is necessary to remove the heater assembly, the cooling system must be drained before removing the heater core.
When a heater core leaks, a new heater core is installed or the old one repaired.

Heater Housing
  • The heater housing is usually under the dash and must be removed to gain access to the heater core.
  • Procedures for replacing the heater core vary with the year, make, and model of car. It threfore necessary to consult the manufacturer's repair manuals for the proper procedure for replacement.


The heater housing is disassembled to get to the heater core.

Heater Core
  • Remove the access panels(s) or the split heater/air conditioning case to gain acess to the heater core.
  • Remove the heater coolant hoses.
  • Remove the cable and/or vacuum control lines (if equipped).
  • Remove the heater core securing brackets and/or clamps.
  • Lift the core from the case. Do not use force. Take care not to damage the fins of the heater core when removing.
  • To reinstall the heater core, reverse the removal steps.
When the heater core leaks and must be repaired or replaced, it is a very difficult and time-consuming job primarily because of the core's location deep within the firewall of the car. For this reason always leak test a replacement heater core before installation.
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