Chevy Monte Carlo

How do I replace heater core in 1986 Chevy Monte Carlo SS?

User Avatar
Wiki User
2009-10-11 16:46:28


everyone should have a manual for their vehicle, and the library

should have a professional shop manual available in the REFERENCE

section...make copies of the right sections...good luck :)

My 1985 Monte Carlo shop manual does not cover heater core

replacement. The heater core in a 1986 Monte Carlo including SS V8

with air and many other GM makes and years is removed from under

the hood by removing one screw after separating the top cover and

bottom half of the plastic AC module. First position the windshield

wipers vertically by turning on the ignition and the wipers, then

turning off the ignition when the wipers are at the top of their

stroke. Remove the bottom windshield trim plate. Remove the heater

hoses from the heater core. In most cases it is not necessary to

drain the system because the hose connection is above the water

level. Remove all electrical connections. Remove the passenger side

leaf screen and windshield squirter. Separate the top and bottom

half of the AC module by removing the surrounding screws, all

screws in the center of the module and screws attaching the top

cover to the fire wall. It may be necessary to run a knife between

the top and bottom halves of the AC unit to break the seal. It may

also be necessary to break the hard sealant bead at the firewall.

This can be done by tapping with a screwdriver and hammer. Remove

the screw at the top of the core and slide the core out. When

putting the AC module back together, a new gasket can be fabricated

by cutting and piecing household adhesive backed weather


Copyright © 2020 Multiply Media, LLC. All Rights Reserved. The material on this site can not be reproduced, distributed, transmitted, cached or otherwise used, except with prior written permission of Multiply.