C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

84 evaporator

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Old May 25, 2014 | 05:54 AM
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Default 84 evaporator

Does anyone know if the 85 evaporator will work on the 84? I can get a new 85 evap from rock auto for 60.00 or 300 for the 84. Looks similar except tube bend.

My inlet tube now has hole in it from trying to dig out a jammed orifice. (completely my fault but wow was it jammed, 150 PSI compressor air from the other side wouldn't budge it!)

thanks for any ideas.

Last edited by 84stock; May 25, 2014 at 07:40 AM.
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Old May 25, 2014 | 07:40 AM
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If you could post a picture of yours, it would help. I have an 85.
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Old May 25, 2014 | 07:50 AM
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By part number the inner case half and the refrigeration hoses are different. I sent you an email with a couple questions. The blower half of the housing is the same and it appears that the balance of the case internals could be also the same. It would take a little time to investigate further.

Any chance of a repair of the tube?

We used to do evaporator repair kits which would be a tube and orfice. I've not used one in maybe 20 years or more but we've done it. 20 years might be a stretch but it's been a long while.

Take a look at a Four Seasons 16152 and 16149. Either I believe would do it for you.

Here's the 16152 on Amazon:

Amazon.com: Four Seasons 16152 Evaporator Core Repair Kit with White Orifice Tube: Automotive Amazon.com: Four Seasons 16152 Evaporator Core Repair Kit with White Orifice Tube: Automotive

Last edited by WVZR-1; May 25, 2014 at 08:21 AM.
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Old May 25, 2014 | 09:23 AM
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Its not out yet, waiting until I have one in hand and start/complete same day. Pretty confident its got a hole in the bottom of the tube. Nothing the repair kit would fix. Pictures on the net show the two different styles side-by-side. Hose ends look the same. Just the new (85+) evap has a longer tube and is bent tighter to the assy. Might take the chance for 60.00 doubt I could weld the hole in my current evap, I’m just not the best mig welder, esp aluminum.

my fault, trying to dig the orifice out.

thanks for ideas
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Old May 25, 2014 | 01:19 PM
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I'm curious too.

Rockauto has the same evaporator listed for the 84 as the 85.

I know the tube is at a full 90 degrees on the 85, compared to a more 45-50 degrees on the 84.


Mine is twisted, from a previous owner. With my compressor imploding, I'm going to flush the whole system and change all o rings when I replace the compressor, dryer and orifice tube.

I'd like to change the evaporator too, so this info would be great to know ahead of time.
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Old May 27, 2014 | 09:20 PM
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FYI
The evaporator has some protection from the orifice tube screen. (really big stuff anyway) The condenser gets high pressure gas directly from the compressor.
On newer little throw away cars if you bring one in with black death (blown compressor) they want to throw away the condenser. The flush machine and time vs new part is a wash.
So do your best to make sure the condenser is clean.

JS
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Old Jun 19, 2014 | 07:24 PM
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Busy times: finally had time to play with AC.

- the 85 evaporator worked easily in the 84. bend of the tube just moved it a up a bit. no big deal. definitely fixed my leak for 1/4 the price.

- now fighting a high - high side reading, wants to go north of 400psi

- orifice tube jams in to low on evap tube. installs fine, but slides down when system operates. hoping this is what is blocking flow. ordered a evap repair kit for a new evap. hoping that tube is better quality. with 85 evap and tube repair kit, line will end up being pretty tall, but this is no show car. it does need reliable AC. when I first installed everything, pressures were good/cold air. now it strains, jumps straight to high pressure.

- may pop in a new compressor, exp tank at the same time and change all orings and both Schrader valves. again, last year installed both new when switching to 134. then use air to blow out all lines and evap/condenser (both pretty new - just verify its clear) this system has never been reliable, though once in a while I can make it cold.

they part I hate? 50 bucks to service and verify. at least I'm getting my money out of the ac vacuum pump.

Last edited by 84stock; Jun 19, 2014 at 07:27 PM.
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