How To Change Heater Core In A 1972 Mustang Mach 1 351 Cleveland.

1971 1972 1973 Mustang Heater Core Removal

1. Disconnect Heater and AC hoses. (See manual on proper Air conditioning disconnection procedures.)

2. Cutting drain hose from under car at lesser of firewall. You may want to save the plug that's inside the finish of the drain hose, which is in that location to prevent critters from inbound your heater box. Note: If you featherbed this pace, you will likely break the fiberglass drain nipple off your heater box trying to pull information technology out.

3. Remove glove box door and glove box insert.

4. If you take a camera, take a film of the vacuum hose and temperature control cablevision area now earlier disassembly. Label hoses to farther assist in reassembly.

5. Disconnect: Thermostat switch wires; vacuum hoses to heater box (2) vacuum canisters; vacuum hoses to (cablevision controlled) water valve switch; and cable to water valve switch.

6. On the engine side of the firewall, remove 2 heater box hex/washer nuts. Easily identified by large washer and long protruding studs.

7. Remove two blower motor housing retaining screws (under dash eye) and allow blower housing to hang (no need to remove the firewall mounting on the blower motor).

8. You may demand to remove the vacuum canisters to give the heater box assembly some wiggle room during removal and installation.

nine. Remove the heater box to cowl retaining screw (look upwardly at right side of heater box).

x. Remove heater box assembly past sliding to the right (to disengage the blower fan), then down.

eleven. On the removed heater box, put a large screwdriver bract in the render of each metal spring prune such that you lot are opening upwards the springs to remove them. Practice NOT pry the clips off by inserting the screwdriver nether the clips – This will permanently impairment the heater box.

Contrary to install.

Though some of the in a higher place is non included in the shop manual, if yous need more than info. (such as diagrams), I strongly recommend buying the total shop manual set up.

These instructions could come up in handy. My 73 Convert still has the original heater core! Only 110k miles just it is onetime! Thanks

Great information i've been stuck for the last couple of days on this trouble.

(01-10-2012, 07:43 AM)Jcyr Wrote: Cracking data i've been stuck for the last couple of days on this problem.

Let us know how it goes or if you have any thing to add to the tips above.

Thank yous for the great information. I bought the manuals but like yous said they do not embrace all that you need to practice. I take been trying to supervene upon the heater cadre and was having trouble. Appreciate it.