AC Installation in a GTV 2000 Part I - Page 3 - Alfa Romeo Bulletin Board & Forums
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post #31 of 46 (permalink) Old 12-24-2013, 12:29 AM Thread Starter
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AC Installation Finalised

Anyone following this thread may recall that I started my AC installation back in late 2010. Well after some considerable period of time in which I moved interstate no less than 3 times I finally completed the installation of AC in my GTV.

I had a mechanic clock the hoses and charge the system. I felt that the mechanic may have used too many 90 degree turns in the clocking of the hoses and the route he used wasn't what I was expecting (maybe too close the radiator resulting in lost efficiency due to heat transfer) but it seems to hold pressure and blow cold (I will advise how cold when I can source a thermometer. Several modifications to the installation which I had described previously in this and other threads had to be changed, including the wiring diagram and the method used to mount the compressor.

Some may recall that I had some difficulty in clocking the hoses due to the location of the outlets on the right-hand side of the evaporator with a right-handed steering column. This was resolved without any fuss by my mechanic - so no real problem there - it just took someone that was a little motivated to give it a try.

To recap the installation details: Sanden SD7H15 Compresser, Battery Odyssey PC 925 MJT (a larger battery may have been a bit better in hindsight) re-located to the boot, Stock Borletti Evaporator Unit, Air Cleaner with 3-way safety switch, 12 inch puller - Derale Tornado 12" fan which draws 8.8 amps at 2100 rpm with a CMF of 880 and is activated with a thermostat, and a Parallel Flow (Superflow) Condenser with a 10 inch curved blade fan that draws 8.0 Amps with a CFM of 800.

The AC took 560 grams of 134a Refrigerant to charge.

An unresolved problem is the large drop in idle experienced when the compressor turns on. This results in the engine cutting out as the car slows to a stop. Some adjusting will be required before this problem is solved.

I revised my Wiring Diagram and this is posted below -

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Last edited by WA-Alfa; 10-27-2017 at 04:45 PM.
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post #32 of 46 (permalink) Old 12-24-2013, 12:45 AM Thread Starter
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AC Installation Finalised - Part 2

Here is the wiring diagram in an Excel file attached if anyone wished to use this.

I have also attached two additional photos. One of the battery in the boot and very very last of all - the green "ARIA CONDIZIONATA" sticker in the rear window.

I should also add that in the last month I have also had the engine completely rebuilt from the ground up. Now that all this work is finished I feel odd and have considered for the first time selling the car...maybe this hobby needs a rest or perhaps it is coming to it's logical end.


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Last edited by WA-Alfa; 10-27-2017 at 04:47 PM.
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post #33 of 46 (permalink) Old 02-02-2015, 05:40 PM
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Hi

Thank you for sharing your experience fitting new aircon into your car.

The size of the condenser being 280x340x26, is that able to keep the system cool when you are stuck in traffic in the sumeer?

I have not measured the tunnel in front of the radiator but i suspect that the condenser you used is about as big as it can be.

Appreciate you sharing your experience running the aircon in the heat of summer and in heavy traffic. As for the idling issue, ya it has to be adjusted.

Cheers
fgc
1750 spider

Last edited by fgc; 11-12-2017 at 05:10 PM.
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post #34 of 46 (permalink) Old 02-07-2015, 07:02 PM Thread Starter
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Hi there,

sorry for the delay in my reply. The condensor is sufficient for purpose and keeps the AC sufficiently cool. I should probaly update this thread with some temp readings when I get a chance.

I spent a lot of time trying to source a condensor and the one I got was about as large as I could find and manage to fit in that very small space (which I measured very carefully).

The larger problem is keeping the engine temp cool when the AC is running on a hot day in city traffic. I haven't really got the radiator cooling sufficient well and so I need to keep an eye on it when driving. I'm not sure what to do to improve the cooling ability of the radiator.

Maintaining the correct idle is tricky but I use the hand throttle.

Hope that helps.

Last edited by WA-Alfa; 02-07-2015 at 07:06 PM.
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post #35 of 46 (permalink) Old 02-07-2015, 07:11 PM
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I put a Classic Air parallel flow with a pusher fan and engine temps are one notch higher in high humidity and 100+ Texas summers.

The passenger seat is 15 miles an hour faster than the drivers seat.

currently
2017 Giulia Q4
74 GTV restored daily driver
71 Berlina in 2L restored driver
the ones that got away:
1959 750 series Giulietta Spider Veloce
1962 Giulietta Spider normale
1965 Giulia Sprint normale
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1974 GTV
1974 GTV
1977 Spider
1974 Spider
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post #36 of 46 (permalink) Old 02-24-2015, 07:03 AM
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my berlina would run hot w/ a/c on. i also have a larger parallel flow condenser. the biggest radiator i could find was the wes ingram aluminum radiator. they say you can't run a normal engine driven fan but by fudging the mounts a bit forward, was able to run the larger u.s. spec fan and trimmed up an old shroud to fit. also run an 12" electric pusher fan that kicks on w/ a/c. near 100 degrees and 90% humidity in stop-n-go traffic and a/c on temps stay around 180
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post #37 of 46 (permalink) Old 10-18-2015, 06:28 PM
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Sorry to be ignorant, but I'm at the very beginning of a similar project on a 73 GTV and am stuck at the beginning. How to remove the bolts on the front of the engine so that I can install the compressor bracket....

They appear to be 17 mm hex head recessed plugs but when I use a 17mm hex wrench on one it feels like it is going to round the plug rather than turn the plug...

thanks
Scott
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post #38 of 46 (permalink) Old 10-19-2015, 05:24 AM
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They will come out about 30% of the time, otherwise it's just as you are experiencing. I'd be reluctant to heat just one part of the head. Hopefully there is someone out here smarter than me because I've had to drill them out usually with the head off. It can be done with the head on very carefulluy bt taking the radiator out and stuffing rags on the inside.
The air will blow ice cold with a 12x14 condenser and a 2200 cfm fan.

The passenger seat is 15 miles an hour faster than the drivers seat.

currently
2017 Giulia Q4
74 GTV restored daily driver
71 Berlina in 2L restored driver
the ones that got away:
1959 750 series Giulietta Spider Veloce
1962 Giulietta Spider normale
1965 Giulia Sprint normale
1972 GTV
1974 GTV
1974 GTV
1977 Spider
1974 Spider
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post #39 of 46 (permalink) Old 10-19-2015, 07:08 AM
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Quote:
Originally Posted by gigem75 View Post
I've had to drill them out usually with the head off. It can be done with the head on very carefulluy bt taking the radiator out and stuffing rags on the inside.
Can you describe how you drill them out (without destroying the threads that need to exist for the AC bracket bolts?)
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post #40 of 46 (permalink) Old 10-19-2015, 11:14 AM
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I drill small 1/8 th holes around the plug as close to the threads as I dare get. Use a sharp punch to drive the plug toward the center off the threads. At some point ti will be loose enough to pick or turn out. It may not be necessary to drill holes all the way around. A big hole with your biggest bit in the center also helps relieve the threads loose. Biggest thing is to not get in a rush. Good luck!

The passenger seat is 15 miles an hour faster than the drivers seat.

currently
2017 Giulia Q4
74 GTV restored daily driver
71 Berlina in 2L restored driver
the ones that got away:
1959 750 series Giulietta Spider Veloce
1962 Giulietta Spider normale
1965 Giulia Sprint normale
1972 GTV
1974 GTV
1974 GTV
1977 Spider
1974 Spider
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post #41 of 46 (permalink) Old 11-17-2015, 08:57 AM
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Back to condenser size... I thought I had put a 12x14 in my Berlina that cools so well, very well actually but it turns out that is the size in my GTV which cools ok but not nearly as cold as the Berlina. Turns out I put a 14x18 in the Berlina which entailed some cutting of sheetmetal. That is why it cools so much better than the GTV which has a 12x14 but no cutting of metal. I am really reluctant to cut on the GTV for obvious reasons and guess I'll just suck it up. In it's defense it cools well enough to drive the car in the heat of our 107 degree summers but just barely. Bottom line, it takes a 14x18 to cool an Alfa but you have to cut to get it to fit whereas a 12x14 is adequate. As far as engine temp goes the Berlina runs cooler with the larger condenser but I have a 1500 cfm 12 inch fan on the Berlina and the GTV has a lower capacity 800 cfm 12 inch fan on it. I'm debating whether or not to go up to the higher capacity fan on the GTV to get it to run as cool as the Berlina and perhaps to blow a little colder as well.
Hope you got the plugs out ok!

The passenger seat is 15 miles an hour faster than the drivers seat.

currently
2017 Giulia Q4
74 GTV restored daily driver
71 Berlina in 2L restored driver
the ones that got away:
1959 750 series Giulietta Spider Veloce
1962 Giulietta Spider normale
1965 Giulia Sprint normale
1972 GTV
1974 GTV
1974 GTV
1977 Spider
1974 Spider

Last edited by gigem75; 11-17-2015 at 09:00 AM.
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post #42 of 46 (permalink) Old 11-17-2015, 10:22 AM
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Just thinking off the top of my head, would an alternative placement work? Perhaps down behind the front facia, with some ducting. You could do an installation like you'd do for an intercooler.

Just spitballing, I'll have to do some measurements.

Everyday is a school day. Learning something new all the time

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post #43 of 46 (permalink) Old 11-17-2015, 04:18 PM
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I'm all for alternative, trick solutions. Also if you could create a condenser in really oddball shapes, even curved there are lots of places to put something like that.

The passenger seat is 15 miles an hour faster than the drivers seat.

currently
2017 Giulia Q4
74 GTV restored daily driver
71 Berlina in 2L restored driver
the ones that got away:
1959 750 series Giulietta Spider Veloce
1962 Giulietta Spider normale
1965 Giulia Sprint normale
1972 GTV
1974 GTV
1974 GTV
1977 Spider
1974 Spider
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post #44 of 46 (permalink) Old 06-19-2017, 09:12 PM
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Getting the fan to work with the compressor off

Hi,
I've got the system installed now. I have the problem that the blower fan will only activate when the compressor is on. From the wiring diagram I have it looks like the temperature switch is wired in series with the fan motor switch. Is there any way I can change the wiring to independently power the fan switch so if can run off key power?
Thanks!
Jonathan

Jonathan
1992 164S, 1974 GTV, 1967 Saab 96, 1969 Jaguar XKE Coupe
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post #45 of 46 (permalink) Old 06-23-2017, 06:40 AM Thread Starter
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This should certainly be possible. . .

Have a look here:

http://www.alfabb.com/bb/forums/hvac...ml#post5057649

and make note of the markings on the switches. The rear of my switches were marked with letters (C & L for example) which may (or may not) correspond to what you have. Does this help?
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