Grief and confusion with 84 A/C high pressure port. (Page 1/2)
fierosound AUG 28, 03:47 PM
Jump ahead to solution: INSTALL new A/C port at front of car.
https://www.fiero.nl/forum/...HTML/147141.html#p13

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I think I found another thing “different” about the 84 vs 85 and up models.
This is regarding the A/C High Pressure Port located in the engine bay near driver's side hinge.

This retrofit kit with straight through adapter on High Port was on the car.



I took it off with vice grips to get at the factory Schrader valve.
The valve was leaking and came out in pieces.
I think it looked like this, but don’t know what size it is (M8?)



I’m not sure if installing a new Schrader will seal (port may be damaged internally?)
So I’d prefer a new High Port adapter with Schrader valve IN IT.

But these catalog listed adapters do not fit (already tried them)
Four Seasons PN 59978
Napa PN A5370



Does anyone know what R134a adapter w/Schrader valve fits the 84?
I need something with a smaller threaded hole than the ones above.

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[This message has been edited by fierosound (edited 09-12-2023).]

RWDPLZ AUG 28, 04:03 PM
The high side port is a smaller 3/16" size VS the low side's 1/4", the 59978 should have fit perfectly, unless the threads were damaged after removing the old adapter, or the wrong part was in the bag. Are the threads on the 59978 too big or too small?

The original schrader valve for the high side is Four Seasons 59345. If the threads and sealing surface are undamaged, it should seal it.

Rhodesia1977 AUG 28, 04:13 PM
I think R12 blew colder than 134. Change my mind!

My AC hasn't worked on my GT as long as I've had it so I just ignored it but than again I do live in northern Michigan!
fierosound AUG 28, 04:20 PM

quote
Originally posted by RWDPLZ:

Are the threads on the 59978 too big or too small?



I bought it based on the information you posted elsewhere, and the threaded hole is too big.
I have two of the straight through type adapter that was on the car (including a brand new one) and they both thread on fine.

So I think the 84 is an "odd duck" and the proper adapter has been discontinued.
RWDPLZ AUG 28, 05:21 PM
I had to buy an adapter to use my R-12 gauge set with my 84 Fiero's ports, but the high side adapter fit both the 84's engine compartment hose high side fitting, and the one from the 85-88 car in the front compartment line.

If the threaded part is too big for the 59978 adapter that fits a 3/16 fitting, maybe yours has 1/4" on both sides? That would be Four Seasons 59977.
fierosound AUG 28, 06:46 PM

quote
Originally posted by RWDPLZ:

If the threaded part is too big for the 59978 adapter that fits a 3/16 fitting, maybe yours has 1/4" on both sides? That would be Four Seasons 59977.



Was an idea worth trying. I took the front "low side" adapter off and it is too big as well.

The adapter I took off looks to be from a bona-fide retrofit kit that was available at some point and I have two of them that thread on fine.
So it's confusing as to what's going on.

Also, in my "bag of misc A/C parts" I found a cap that fits on the R12 A/C port as it would have come from the factory.
Not sure where I got it from, but thinking I took it off an all original Fiero at a wrecker on a "scavenger hunt".
(and no, it's not a tire valve stem cap - those are too small)

[This message has been edited by fierosound (edited 08-28-2023).]

fierosound AUG 28, 07:15 PM
Oops...

[This message has been edited by fierosound (edited 08-28-2023).]

RWDPLZ AUG 28, 07:37 PM
I HAD a picture of the 84 hose assembly until the image server got nuked. But I did find this picture in my own old pics, it shows the 84 and 85-88 cars use the same fitting/port for the high side.



Maybe someone with an 84 can get a picture of theirs on their car? Mine's 4 hours away in storage.
fierosound AUG 28, 09:55 PM

quote
Originally posted by RWDPLZ:

I HAD a picture of the 84 hose assembly until the image server got nuked. But I did find this picture in my own old pics, it shows the 84 and 85-88 cars use the same fitting/port for the high side.

Maybe someone with an 84 can get a picture of theirs on their car? Mine's 4 hours away in storage.



Odd. Maybe mine is finicky and I wasn't holding my mouth right when I tried installing the thing.
The thread does appear to be 3/8"-24 which is what the FS 59978 adapter is. I'll have to get another and try again.
fierosound AUG 29, 10:54 AM
n/m

[This message has been edited by fierosound (edited 09-12-2023).]