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First, drain your system's coolant into a container (and dispose of properly) Locate the two hoses that go into your firewall. These hoses go into and out of the hearer core and remove them. There should also be rubber insulators on the inlet and outlet of the heater core. Unscrew each hose's fastener and remove these hoses. Do not dispose of these hoses as they will be reused.
Next, go iside of your vehcle and remove the under dash cover and then locate the heater duct. It has a number of small screws plus clips that hold it in place, remove them. The duct should then be removed. There is also a small cover over the heater core inlet/outlet pipes. It is held on with three screws, one of which is a little hard to see, remove them and take off the small cover. It may be glued in place by a tar like insulating material. The heater core is held in place by two strap clamps over it which are held on with two screws in each.
Finally, Remove the screws and clamps. The heater core will now come out
Reverse the procedure to install the new heater core. Refill the coolant and check for leaks.
THERE IS NO HEATER CONTROL VALVE ON THE WATER HOSES. NEW HEATER CORE. INLET LINE right before heater core hot, outlet after core look warm. Burped cooling system 5 times with engine at operating temp. Installed homade burp VALVE right after heater core outlet(high part of hose). Still no heat. Removed water pump, impeller still in good shape not stripped off shaft. Removed heater core hoses flushed water thrue the connections on the block to the water pump INLET and outlet. flushed water thrue heater core and hoses. Going to put it back togeter today. Used known good gauge to check water temp for operating temp in test. 195 f
HEATER CORE REPLACEMENT REMOVAL PROCEDURE
1. Remove the fuel injector sight shield.
2. Drain the cooling system. Refer to Draining and Filling Cooling System in Cooling System.
3. Use J 38185 in order to position aside the heater hose inlet and outlet clamps at the heater core.
4. Disconnect the inlet and outlet heater hose from the heater core.
5. Remove the RH Instrument Panel Closeout/Insulator panel.
6. Remove the LH Instrument Panel Closeout/Insulator panel
7. Remove the floor carpet.
8. Remove the rear floor air outlet duct from the holes in the floor reinforcement.
9. Disconnect the rear floor air outlet duct from the heater air outlet cover.
10. Remove the rear floor air outlet duct.
11. Remove the heater air outlet cover screws .
12. Remove the heater air outlet cover heat stakes with a small chisel.
13. Remove the heater air outlet cover from the HVAC module assembly.
14. Remove the heater core cover screws .
15. Remove the heater core cover heat stakes with a small chisel.
16. Remove the heater core cover from the HVAC module assembly.
17. Remove the heater core from the HVAC module assembly.
18. Remove the heater core foam seal (1) from the HVAC module assembly.
1. Install a new heater core foam seal to the HVAC module assembly.
2. Install the heater core to the HVAC module assembly.
3. From the inside of the heater core cover, drill the dimples adjacent to the heat stakes using a 5.5 mm (7/32 in) drill bit.
4. Install the heater core cover to the HVAC module assembly. NOTE: Refer to Fastener Notice in Service Precautions.
5. Install the heater core cover screws . Tighten Tighten all screws to 1.5 N.m (13 lb in) .
6. From the inside of the heater air outlet cover, drill the dimples adjacent to the heat stakes using a 5.5 mm (7/32 in) drill bit.
7. Install the heater air outlet cover.
8. Install the heater air outlet cover screws (2). Tighten Tighten the screws to 1.5 N.m (13 lb in) .
9. Connect the rear floor air outlet duct to the heater air outlet cover.
10. Install the rear floor air outlet duct to the holes in the floor reinforcement.
11. Install the floor carpet.
12. Install the RH Instrument Panel Closeout/Insulator panel.
13. Install the LH Instrument Panel Closeout/Insulator panel.
14. Connect the inlet and outlet heater hose to the heater core.
15. Use J 38185 in order to reposition the heater hose inlet and outlet clamps to the heater core.
16. Install the fuel injector sight shield.
17. Fill the cooling system.
This is an easy $7.00 fix. Go to your local auto parts store and get a GM Heater Hose Fitting. I went to NAPA, part #730-5631. Cut of the old fiting with a hack saw blade, being careful not to damage the pipe from the heater core, put the new one on. Total time takes less than 10 minutes, make sure you fill your coolant resevoir.