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Old 05-03-2021, 01:33 PM   #1
propav8r
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Default Swapping late model 240 HVAC box into a '79

I have a complete '93 HVAC unit to go into my '79 and figure I should probably do that now since the old unit has a leaking heater core anyway. Any big gotchas to the swap I should be aware of or is it just gonna be a drop it in and make room where you need to thing?
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Old 05-03-2021, 01:36 PM   #2
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Drops right in. Massively helpful to have the 91-93 firewall panel handy. Keep your 79 ducting as it's different than the later dash stuff.
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Old 05-03-2021, 01:52 PM   #3
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I'm fairly sure I have the firewall panel too. Maybe. What's different, just the openings?
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Old 05-03-2021, 02:01 PM   #4
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It's shaped a bit differently and uses different seals. Different enough to make it worth finding.
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Old 05-03-2021, 02:03 PM   #5
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Gotcha. Thanks.
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Old 05-03-2021, 02:06 PM   #6
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i know this is a different year model but i ran into this issue last weekend when i did the hvac box update. had to replace the ducting for the center vents

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you can see the center vents do not line up so i had to get creative with some dryer ducting
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Old 05-03-2021, 03:49 PM   #7
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Indeed, center vent ducting is unique for the later style ('91-'93?), the piece that connects between the blower outlets and the vent outlets in the 81+ dash.

Hadn't realized this before but there may not be an OE part that connects the 93 HVAC outlets to the 75-80 dash center vents, so some creative hacking might be necessary. I'll be doing the same job pretty soon too.
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Old 05-03-2021, 03:54 PM   #8
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Indeed, center vent ducting is unique for the later style ('91-'93?), the piece that connects between the blower outlets and the vent outlets in the 81+ dash.

Hadn't realized this before but there may not be an OE part that connects the 93 HVAC outlets to the 75-80 dash center vents, so some creative hacking might be necessary. I'll be doing the same job pretty soon too.
You just use the early side ducts as they exchange no problem.
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Old 05-03-2021, 04:37 PM   #9
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you might run into a 3 vs 4 position fan speed switch?
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Old 05-03-2021, 04:43 PM   #10
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you might run into a 3 vs 4 position fan speed switch?
Ah yeah. I do have the panel/switch from the 93 unit as well, so just gonna swap all that in together.
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Old 05-03-2021, 04:49 PM   #11
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You just use the early side ducts as they exchange no problem.
Good to know - thanks!
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Old 05-03-2021, 09:43 PM   #12
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Are you going to covert to the later style on-off snowflake compressor switch or keep the original knob and capillary tube setup?
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Old 05-04-2021, 11:27 AM   #13
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Are you going to covert to the later style on-off snowflake compressor switch or keep the original knob and capillary tube setup?
Without reviewing the write-ups again, I don't think you can use the knob/capillary set-up in the later orifice tube systems. You could still use the knob as the on/off switch, but the capillary tube wouldn't adjust anything because the orifice tube takes the restricting job from the TXV.
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Old 05-04-2021, 08:38 PM   #14
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Without reviewing the write-ups again, I don't think you can use the knob/capillary set-up in the later orifice tube systems. You could still use the knob as the on/off switch, but the capillary tube wouldn't adjust anything because the orifice tube takes the restricting job from the TXV.
Ah. Yeah. That makes sense.
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Old 05-05-2021, 02:19 AM   #15
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Originally Posted by volvowagoon View Post
Without reviewing the write-ups again, I don't think you can use the knob/capillary set-up in the later orifice tube systems. You could still use the knob as the on/off switch, but the capillary tube wouldn't adjust anything because the orifice tube takes the restricting job from the TXV.
That's correct, it's a different set up.

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Old 05-06-2021, 10:59 AM   #16
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If you're set on running with orifice tube, make sure to get a variable rate compressor (newer style), personally the TXV setup is more desirable as it's more efficient and wears on the clutch and therefore all accessories quite a bit less. You'll need to move the condenser right as close to the radiator as possible or box in all air holes to ensure no flow loss (made a huge difference on high side pressures for me). Definitely add the highest flow electric fan you can fit and clean up all air dams to make sure you're not losing any fresh air. Enjoy the cold, it's done wonders for my summer road trips!
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