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by bohica2xo
Thu Jul 23, 2020 6:32 am
Forum: Automotive Air Conditioning Forum
Topic: 1961 cadillac conversion
Replies: 64
Views: 16025

Re: 1961 cadillac conversion

Yep. GM kept that manifold footprint across several compressor platforms. The R4 began to replace the A6 in 1975 for some GM cars. It was widely used for the next 20 years. I believe the 1996 Buick Roadmaster was the last production car with the R4. Then came the parade of compressors - H6 DA6 HR6 V...
by bohica2xo
Wed Jul 22, 2020 5:06 pm
Forum: Automotive Air Conditioning Forum
Topic: 2000 Excursion Rear AC Issues
Replies: 14
Views: 3242

Re: 2000 Excursion Rear AC Issues

LOL Tim. Always the Optimist.

My cousin's Excursion Land Yacht seems to cool ok when he visits me here. When I ride with him I call out turns as Port or Starboard, describe the traffic as sea states...
by bohica2xo
Wed Jul 22, 2020 4:53 pm
Forum: Automotive Air Conditioning Forum
Topic: Mark IV AC evaporator history questions
Replies: 14
Views: 3156

Re: Mark IV AC evaporator history questions

Sorry we hijacked your thread David.

A friend of mine is building a 1959 Chevrolet station wagon, and he is doing just what you are - adding an original knee-knocker.

I am trying to convince him to put an evaporator in the back too. We are stumped on exactly what that should be however.
by bohica2xo
Wed Jul 22, 2020 4:49 pm
Forum: Automotive Air Conditioning Forum
Topic: 2000 Excursion Rear AC Issues
Replies: 14
Views: 3242

Re: 2000 Excursion Rear AC Issues

Excursions were huge. Large interior volume, and lots of glass as Tim pointed out. It will cool down, but it will take a few minutes. Recirculate is your friend. Go for a 30 to 40 minute drive someplace. You will pull the cabin down to a comfortable level before you know it. That is why here in Las ...
by bohica2xo
Sun Jul 19, 2020 9:45 pm
Forum: Automotive Air Conditioning Forum
Topic: 2005 Mustang does not charge
Replies: 10
Views: 2443

Re: 2005 Mustang does not charge

Got flow from the can tap? Crack the feed line at the manifold to bleed it?

Between the can taps and check valves there is plenty to go wrong there.

You seem to have signal on the high & low side, the gauges are moving - so the couplers are open, at least a little bit.
by bohica2xo
Sun Jul 19, 2020 4:08 pm
Forum: Automotive Air Conditioning Forum
Topic: 1961 cadillac conversion
Replies: 64
Views: 16025

Re: 1961 cadillac conversion

There are 2 pulley sizes for the R4 serpentine. That one is the smaller of the two. It was standard on the 5.7 & 7.4 V8's with their generous crankshaft pulley. There is a larger pulley, but you would give up capacity at idle. Most of the 5.7's in the mid 1990's upshifted above 4800 rpm. If you ...
by bohica2xo
Sat Jul 18, 2020 12:27 pm
Forum: Automotive Air Conditioning Forum
Topic: Mark IV AC evaporator history questions
Replies: 14
Views: 3156

Re: Mark IV AC evaporator history questions

Ice; The OHV version of my single is at 803 cc's now. Quite a popper, with the 4.75 inch stroke. No track time since January because of the virus mess. Yotes took a beating this spring. Nothing better to do than sit up all night waiting for them. Cougars have replaced them for rabbit control. Have b...
by bohica2xo
Sat Jul 18, 2020 12:11 pm
Forum: Automotive Air Conditioning Forum
Topic: Vacuum Pump CFMs?
Replies: 5
Views: 1413

Re: Vacuum Pump CFMs?

CFM has no effect on vacuum. High CFM pumps mean a technician spends less time evacuating large systems.
by bohica2xo
Thu Jul 16, 2020 4:56 pm
Forum: Automotive Air Conditioning Forum
Topic: 1961 cadillac conversion
Replies: 64
Views: 16025

Re: 1961 cadillac conversion

Yeah, the NVH department at most automakers should be fired. Liquid filled engine mounts and every other non-functional cost increaser they can find. I heard some whiner complaining recently that he could hear the fuel injectors clicking at idle with the hood up. I told him to trade it for a Nissan ...
by bohica2xo
Thu Jul 16, 2020 9:03 am
Forum: Automotive Air Conditioning Forum
Topic: 1961 cadillac conversion
Replies: 64
Views: 16025

Re: 1961 cadillac conversion

Way to go Tim. Actual Delco parts!

No, never going to be the quietest unit. Using the steel can for the refrigerant circuit is good from a thermodynamic standpoint, but it does transmit some cylinder noise. But they got the job done in large vehicles for decades.

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