The Air Conditioning thread...

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xirdneh
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Re: The Air Conditioning thread...

Post by xirdneh » Sat Nov 07, 2015 11:58 am

i have a good unit (not sure what it is called) that is under the dash between blower and heatercore housing
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Re: The Air Conditioning thread...

Post by JDNightFox » Wed Jun 21, 2017 7:22 am

Sorry to revive this but I just got my 86 back from Firestone for the 134a conversion and I'm pretty sure they installed the fittings wrong

He said he got the AC blowing cold for about 30 seconds and then "the expansion valve went out because the pressure kept surging"

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Re: The Air Conditioning thread...

Post by irowiki » Wed Jun 21, 2017 8:12 am

I also had Midas install the fittings backwards as well.
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Re: The Air Conditioning thread...

Post by JDNightFox » Wed Jun 21, 2017 8:34 am

irowiki wrote:
Wed Jun 21, 2017 8:12 am
I also had Midas install the fittings backwards as well.
I already bought a new expansion valve and drier but can I assume it was surging because of them trying to fill it through the high side? or would it be safer to just pull the box and change those parts so that I can also blow the dust out of the radiator inside too

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Re: The Air Conditioning thread...

Post by Petros » Wed Jun 21, 2017 1:38 pm

diagnose the problem before you try and fix it. I do not see why that would cause the valve to fail, all you would do is not get enough refrigerant into the system. It might, but I do not see how, he should not be putting that much pressure into the system. OTOH, if it has been a while it may have been old and about to fail anyway. If that is what indeed is wrong with it.
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Re: The Air Conditioning thread...

Post by irowiki » Wed Jun 21, 2017 2:24 pm

When I converted mine to 134, it was being all funky so I ended up replacing the evaporator, expansion valve, and drier. Then replaced the compressor and it has worked great since!
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Re: The Air Conditioning thread...

Post by JDNightFox » Wed Jun 21, 2017 3:46 pm

The guy said the system blew cold for about 30 seconds and then said the valve was making the pressure surge, told me everything else was working

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Re: The Air Conditioning thread...

Post by BaileySims » Tue Jun 27, 2017 3:27 pm

Does anyone know if this is the correct seal for our compressors? I have purchased the four Seasons seal kit through rock auto and it wasn't even close to fitting. Mine is definitely leaking from the front and would just like to know if this seal will fix it to get me through the 100+ degree everyday summer until I am able to afford another compressor. Thanks.

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Re: The Air Conditioning thread...

Post by BaileySims » Thu Aug 02, 2018 6:48 am

Bump. Now the 230 dollar reman compressor I installed blew the front seal out too. I don't think it's under warranty anymore either. :/
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Re: The Air Conditioning thread...

Post by CathodeRayTube » Thu Aug 02, 2018 8:30 am

Mine is still apart and i dont have a functioning Tercel presently...the A/C in the automatic that i rebuilt the compressor in, blew out the generic Large Chinese O rings i used on the compressor body within 1 trip.. the brakes need to be redone also and why it was parked. but i think the front seal is probably still good, i had replaced it during the rebuild. It looks like the one Bailey Pictured. I remember you must be very careful installing it, as not to gouge anything or its easy to ruin it and have it leak again...Using Propane here, with good results in the entire rest of the Mothball fleet, especially the Fords, which blow 20 degrees and will freeze you out.. straight propane is more like R22 but backwards compatible, 60% Propane 40% ISOButane approximates R12 closer and is whats in the Yugo. Planning to rebuild everything eventually, but for now the Nissan Stanza Wagon and my E350 diesel are my main vehicles and the 3 Tercels are sitting on the back burner. To rebuild the compressor again, i was going to take the original seals that i still have, and dunk them in gasket shellac or possibly use RTV and see if those hold up...otherwise i may be retrofitting another compressor from something else, or possibly even an electric sealed unit from a household window AC being driven off an Inverter. Parts for these compressors were hard to find...but i still have one or 2 untouched ones i could try with other tricks like Leak Stopper.
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Re: The Air Conditioning thread...

Post by CathodeRayTube » Thu Aug 02, 2018 8:39 am

FYI also, Most of these compressors, swash-plate and piston designs can ingest some liquid refrigerant without issue. Scroll compressors i think are more sensitive.
86 T4 DX 4x4 - Diesel Swap project
85 T4 DX 4x4 Automatic
83 T4 SR5 - junker/parts
94 4Runner V6
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85 F250 dually 6.9 turbo diesel
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Re: The Air Conditioning thread...

Post by BaileySims » Thu Aug 09, 2018 8:22 pm

Got lucky. My compressor was under warranty and I was able to get another reman from rock auto. Threw that and a new evaporator core in as well.

Now the issue is that it runs, quite well, then after shut down, it sounds like the clutch is chattering or still trying to grab? I ran the ac, shut it off and quickly went to the front of the car to see the compressor stopped, but the clutch was moving slowly, then stopped after a bit. Doesn't sound too bad, but it does not sound normal either.

Is there some adjustments I could make to the clutch or just let it ride out and hope that the noise goes away? Thanks.
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CathodeRayTube
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Re: The Air Conditioning thread...

Post by CathodeRayTube » Sat Aug 11, 2018 10:45 am

Id say the clutch moving is normal...its like a regular clutch in anything else there may be some trivial contact/friction going on, especially if its new and not worn in yet. the A/C system in the T4 i believe has a controller that shuts the compressor off at 2 different temps...a lower one for ON and a slightly higher one for ECO mode.. both modes cycle the compressor on and off...which is a superior system to my Mercury in that the compressor doesnt run all the time and you dont turn the heat up to compensate...manual a/c.. the T4 has smaller condensers/evaps, so its more sensitive to having the correct (most effective) Freon in it...id start with a fully cleaned/purged system, pump mineral spirits through the system to flush everything out.. blow air though it, pull vacuum on it, make sure the oil is the prescribed type and amount...new compressors are supposed to have oil in them and it usually stays there but some can circulate around with the freon. Id recommend staying away from 134a...it will never be right or as effective as R12 or a HC replacement as the system wasnt designed to work with it. 134a uses higher pressures and uses special oils. iv heard 134a also causes testicular cancer...
86 T4 DX 4x4 - Diesel Swap project
85 T4 DX 4x4 Automatic
83 T4 SR5 - junker/parts
94 4Runner V6
86 Mercury Grand Marquis
88 Lincoln Town Car
90 Yugo GV+
85 F250 dually 6.9 turbo diesel
81 VW Rabbit Turbo diesel project

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