Heater box A/C car removal

moparfanUSA · Monday at 12:17 PM

I was driving on Sunday and all of a sudden hot Anti-freeze starting pouring in on the pass side. The whole side is flooded, no needless to say, I'm sure I blew the heater core. I will have to remove the whole heater box.
As far as I can tell I have to remove the glovebox ( how I am going to get that out without breaking the board is going to hard in itself). Can the whole heater box come out without taking the dash out. This is an A/C 69 B body.
Any specific steps to take?

LowBikeMike · Monday at 12:24 PM

Read the Factory Service Manual. You do not need to remove the entire assembly, you can remove the front cover that houses the heater core. It's a bad job but the dash doesn't need to come out. Good luck on getting the glove box insert out, I've never had any luck removing them.

R413 · Monday at 1:15 PM

There are many fail points inside there besides the heater core. Did you know there are two 5/8" heater hoses inside your box? Along with a water valve and two o-rings on the inlet pipes where they bolt to the box.

It's not much fun but try to diagnose it in the car and see what's leaking.

The box will come out with the dash in place.

The glove box liner was put in from the back with dash out of car. And it's easier to work on it with that liner removed.

moparfanUSA · Monday at 6:44 PM

Thanks, I know that the glove box its going to a pain to remove. Let's see what happens.

70runner · Tuesday at 4:29 PM

Rebuilt heater/AC box in daughters 69 Charger few years back. As noted above lots of potential leak sources incl heater core. Be careful sourcing repro heater core for AC box. First one I tried wasn't even close to proper fit. Ended up having orig rebuilt by Glen-ray. Had Glen-ray (good folks) test the heater valve, it was leaking also. No one rebuilds these (or at least they didn't 4yrs ago). Managed to find a company in Texas (Old Air Products) purely by luck that sold valve identical to the OE. Also, if you pull the box, make sure to pressure test the AC evaporator core while you have it apart.

F4R/T · Tuesday at 4:45 PM

Reseal you’re wiper posts while your in there, they make seal kits for the box too! Just take your time!

Mheiron · Tuesday at 7:13 PM

Isn’t the glove box cardboard? Take the door off and bend it in the middle after removing the screws. Definitely not the hardest part. Don’t know your car but on a Charger you take out the ash tray, radio and control panel. Did mine recently and didn’t remove the dash. I took the seats out to get access to everything. Mine was a factory AC car and removing the air box was like a 7/10 job. Took a few weekends but it wasn’t rocket science. The old boxes are heavy so putting it back took some muscle power.
The other option is take the heater out of service and live without a heater. We seldom need them down in Texas.

moparfanUSA · 2025-07-23T10:48:37-0500

I know the A/C core is good, as the A/C still works fine.
Thanks for all of the advise.

Heater box A/C car removal

moparfanUSA

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LowBikeMike

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R413

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moparfanUSA

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70runner

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F4R/T

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Mheiron

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moparfanUSA

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