1996 GMC Suburban Rear Heater Core Hose Removal and Installation
I am working on removing a Rear Heater Core Hose. It is not connected using the traditional method of hose clamps. it is connected more like a hydraulic hose. There is no nut to turn, no clamp to squeeze. How can i remove the hose without causng further damage. Photo can be provided if needed.
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You will probably need new heater hose...first check heater hoses that run from engine to the
heater core......Most hoses will tear at the end where they are connected to the core and at the engine...First mark where each hose goes then drain coolant from system and remove both hoses...Take old hose's to parts store and get new hose's and clamps...They should be dryrotted
by the year of vehicle....It is easy to bend or break new core so be very careful when installing new core....After removing old hose's from core under hood you will know the location of the core....
remove screws under passenger side dash to remove core from inside of dash...very simple very easy....It looks like a tiny radiator with an in and an out spout...dont forget to mark where hoses
connect before removal.......Be sure and refill with new coolant/clamps/hoses because of age of vehicle...Both heater hose's that connect to the core are connected at the firewall on the passenger side of the engine...The core fits into the firewall dash and is connected to an input and an output hose...THIS IS EASY FOR BEGINNERS BUT BE CAREFUL WITH NEW CORE NOT TO BEND !!
It sounds like you probably have a leak in your heater core. Replacing a heater core can be a difficult job. If you decide want to try it I suggest you get a shop manual to help you out. I can give you a relatively easy temporary fix that will stop the leak until you have more time to fix it or you can take it into a shop to have it done. The down side is this fix will temporally disable your heater. Wait for the engine to cool. Open the engine compartment and look all the way in the back between the engine and the firewall. Find the 2 heater hoses that pass through the firewall. They should be about 1 inch in diameter. Undo the hose clamps and disconnect them from the firewall. Get a short piece of metal tubing about the thickness of the inner diameter of the hoses. Use this metal tubing to connect the heater hoses together and clamp them using the two hose clamps. Now the antifreeze that would normally circulate through your heater core will instead circulate through this loop and not enter the passenger compartment. If you can't find a short piece of metal tubing to do this fix you can completely remove one of the heater hoses. Then take the other heater hose and connect it to location near the engine where you disconnected the first hose. Save the first hose so you can hook it up later when you do the more permanent fix. Make sure to position all hoses such that they aren't resting on any hot surfaces. I hope this advice helps you out.
Make sure you have the anti-theft codes for the audio and the navigation system, and then write down the audio presets.
Disconnect the negative cable from the battery.
From under the hood, disconnect the heater valve cable from the heater valve. Turn the heater valve arm to the fully opened position.
When the engine is cool, drain the engine coolant from the radiator.
Disconnect the inlet heater hose and the outlet heater hose from the heater core.
Remove the mounting nut from the heater unit. Take care not to damage or bend the fuel lines, the brake lines, and related parts.
Remove the dashboard.
Remove the evaporator.
Remove the mounting bolts and remove the heater unit.
Front heater unit
Remove the self-tapping screws and the clamp.
Carefully pull out the heater core so you don't bend the inlet and outlet pipes.
Front heater core
Using care, install the heater core to the heater unit and secure.
Using care, install the heater unit and tighten mounting nuts and bolts to 7 ft-lb (10 Nm).
Install the evaporator.
Install the dashboard.
Connect the inlet heater hose and the outlet heater hose to the heater core.
Connect the heater valve cable to the heater valve.
Refill the cooling system with engine coolant.
Adjust the heater valve cable.
Make sure that there is no coolant leakage.
Make sure that there is no air leakage.
Connect the negative battery cable.
Perform the power window control unit resetting procedure.
Enter the anti-theft codes for the audio and the navigation system, and then enter the audio presets.
RearTo Remove: NOTE: The rear blower motor, the rear heater core, the blower screen, the rear blower resistor (heating/air conditioning system) and the rear power transistor (climate control system), the rear air mix control motor (climate control system) , the rear mode control motor and the rear expansion valve can be replaced without removing the rear heater-A/C unit.
Remove the self-tapping screws and the clamp, and then remove the bolts and the rear evaporator lines with the rear expansion valve. If necessary, remove the rear expansion valve. Use a second wrench to hold the other fitting on the valve so the rear evaporator lines won't twist. Leave the first fitting loosely connected so you can use it to hold the valve while you loosen the second fitting.
Remove the rear heater hoses.
If necessary, remove the rear blower motor, the rear heater core, the blower screen, the rear blower resistor (heating/air conditioning system), the rear power transistor (climate control system), the rear air mix control motor and the rear mode control motor.
Remove the self-tapping screws and the lower housing.
Remove the self-tapping screws, and carefully separate the left upper housing from the right upper housing. Remove the rear heater core.
Rear evaporator assembly
Replace the rear heater core.
Attach the heater hoses.
Make sure no air is leaking from the left upper housing and the right upper housing fitting and from the upper housings and the lower housing fitting.
Before reassembly, make sure that the rear air mix control linkage and door move smoothly without binding.
Before reassembly, make sure that the rear mode control linkage and door move smoothly without binding.
Reassemble the housing.
After reassembly, make sure the rear air mix control motor runs smoothly.
After reassembly, make sure the rear mode control motor runs smoothly.
Refill the cooling system and make sure that there is no coolant leakage.
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 was the procces on an 86 chev 1/2 ton. Should be the same. Remove glove box. Undo manual controls for duct work. you'll see them there behind where the glove box was on top of the heater core housing. Bemove screws/bolts. Don't remember how many there are. Undo hose clamps in the engine compartment. Remove heater core.
the problem is in the rear expansion valve. this valve is located at the rear evaporator core. i am assuming the freon level has been checked and is ok. this is a common problem with these vehicles. hope this helps!!