S4 spider 1991 Ac part missing Pressure switch - Alfa Romeo Bulletin Board & Forums
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post #1 of 4 (permalink) Old 09-14-2018, 01:23 PM Thread Starter
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S4 spider 1991 Ac part missing Pressure switch

I went to charge my AC after it having been left dead for years and discovered that the "pressure switch " was missing and therefore preventing the changing of the system. Now that I look at the closeups, it looks like it might be a tube that is broken off in the socket. here are pictures of the empty hole. I also do not see any electrical connector foe a switch if one was there. I know little about an hope someone might.
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post #2 of 4 (permalink) Old 09-14-2018, 01:28 PM
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That's not the pressure switch: the pressure switch is on top of the receiver/drier unit in the right front fender. What happened there is the metal hose from the top of the compressor has snapped.

Interestingly, the original hose on my '91 failed in the exact same location. Must be a vibration metal fatigue issue or something.


1963 Giulia Spider (1750 engine)
1974 GTV
1991 Spider
Former: 1987 Milano Gold
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post #3 of 4 (permalink) Old 10-01-2018, 08:06 AM
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Those hose were breaking when the cars were new. Its also the cause of the vibration that Alfa had to fix by hanging a weight on it. The best opinion is to take it off and take both ends to a A/C shop or supply house and have a new one made. But eliminate the metal pipe.

You will fix the breaking and vibrating problem.

1969 1750 Spider Veloce w/dual webers, 1969 1750 Berlina, 1971 1750 Spider Veloce w/ dual webers, 1985 Spider Veloce 23,000 orig. miles, {Two} 1986 Spider Veloces, 1987 Spider Veloce bought new, 1988 Quadrifoglio, 1991 164S, Plus several more. I think they are breeding.
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post #4 of 4 (permalink) Old 10-03-2018, 03:33 AM
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this is the weight Jim is speaking of
(just for interest's sake)


Dom - Alfa Spider 1990 S4 - formerly: Alfa 101 Sprint, 2600 Sprint, Montreal - family classics: Jensen Interceptor II, '58 Hooper RR Silver Cloud I, Shadow II, '60 Corvette.
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hvac, s4spider, s4spider ac, spider, spider ac

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