Air Conditioning Explained - How It Works and How To Fix It, R12 to R134a Conversion - Volvo 740

This time, I get the wagon's AC working and explain how everything works in excruciating detail.
In this video, you can learn about some basic thermodynamics, latent heat, vapor pressure, vapor cycle air conditioning operating principles, refrigerants (R12, R134a and R1234yf), how to service your AC, how to use a manifold gauge, and how to troubleshoot your A/C.
00:00 Intro
00:52 Operating Principles
18:34 Refrigerant Lines
25:09 Compressor and Oils
27:52 Condenser/Flushing
30:54 Expansion Valve, Evaporator, Receiver-Drier
34:57 Vacuuming System, Leak Test
38:10 Electrics
42:56 Refrigerants
45:09 Charging The System
48:13 Pressure Switches
50:03 Troubleshooting/Manifold Gauge
54:51 A/C Working
56:50 Leak Check 2
58:00 Ok Bye

[@PDNW]

I'm a simple man. I see baked beans garage has uploaded, I hit like

[@GmKcorp]

This 740 should be a nice cruiser when its done. Thank you for an great video about ac systems.

[@gunslinger135]

Do a 850 R resto mod Love your Volvo videos they are amazing

[@vwfanatic2390]

So now you can crank up the AC in the turbo brick, put your lower jaw right up to the vent, and you’ll be even more of a chinchilla.
Excellent video, thanks.

[@Foghorn117]

Great video, in depth, concise, entertaining. 🎉

[@actuallytyler8262]

absolutely fantastic, you deserve way more subscribers. a gentleman and a scholar!

[@bakedbeansgarage116]

Doing my best to grow the channel, hopefully it gets some traction soon!

[@gaucker398]

NEED BBG merch

[@patinthehat617]

I beg

[@JonTRD]

Nicely done, Any updates on results

[@sunofnihl]

I love the shout out to the Chevy Celebrity. I still remember what my grandpa's smelled like inside the cab.

[@chazbganster]

This video has inspired me to buy a compressor and all the fixin’s from rockauto for my 1988 740. Hopefully I don’t screw it up too bad. 🙏🤞

[@jarnbro0634]

Another amazing video keep it up Will try instal ac on my 745 d24tic-87 now after watching this.

[@sigalane]

Great content once again. Keep up the good work!

[@jara..]

Love your videos man, keep it up. Im planning to do a manual swap on my dad's 940 d24tic and ur videos help( like removing the rear axle and transmission)

[@bakedbeansgarage116]

Thanks for the support!

[@HookerJoeFire]

Another great video!

[@kewlbean]

Excellent video.

[@DaltonDouzaire]

Hi, please, what's the sensor on the expansion tank ?

[@brianknotts8216]

It's spring. Does the Bolens need any other work?
That was fun.

[@bakedbeansgarage116]

Frustratingly, the HT20 just won't break, so not at the moment. I do have a G10, 1886 and '50s Ride-a-matic that all need much love. I'll probably get to at least one of those this fall.

[@user-tt2if5et9n]

Superb.

[@mechanical7038]

How important is it for the reciever dryer to be close to the evaporator? I'm thinking about retrofitting an ac in my 740 -92 but to avoid having to tear out the dash, i'm thinking about putting the fan and evaporator in the trunk.

[@maxrodriguez3851]

I don't think it matters how close to the evaporator the receiver drier has to be, all it really does is catch moisture. But moving the evaporator and fan to the trunk, the hose lines will have to be long enough to make it back there. Also all the cool air will blow from the trunk, rather than on your face. so ¯\_(ツ)_/¯

[@kaiseymour2964]

At 42.30, why did the pressure switch pull in the compressor clutch if the system wasn't yet charged? ie didn't have pressure? Also, do those pressure switches always have a schrader valve? I'd like to change mine but don't want it to all leak out

[@maxrodriguez3851]

the compressor clutch is just an electromagnetic clutch. So its activated by electricity, it does not matter if the system is charged. Anytime the system is opened the pressure and Freon will leak out.

[@maxrodriguez3851]

Hey, I'm using this video as a very helpful resource to help me redo my ac system in my Volvo. I just have a simple question, I noticed he only used one size hose for both the high and low side lines. Does anyone know if that matters if all hose lines are the same size, or if the low side has to be a larger hose and the high side has to be the smaller hose. When I removed my old system the hoses were 2 different sizes. Any input is appreciated, thanks.

[@bakedbeansgarage116]

They are two different sizes, sorry if I didn't explain that. The low pressure side is pretty much always a larger hose. #8 and #10 in this case.

[@zionmcflyin1864]

eye quality videos

[@glurak888]

Can we use this for late 240s aswell?

[@bakedbeansgarage116]

Kinda, just about everything in the video applies to any car with AC.

[@jaywiggin1139]

Did the diesels not get an aux electric fan on the front of the condensor/radiator? My '87 turbo had one (it was seized also the system was long empty). I guess without a high-pressure switch there'd be nothing to trigger it, I'm just curious.

[@bakedbeansgarage116]

They did, I just haven't put it back yet. It only comes on with the coolant switch though, not the AC..

[@pistolpoppa]

Please connect the crankcase ventilation onto the sucktion side of the turbo, these engines do not like the excessive wear of having no propper pcv. Dieselpacko has a very good video about it, sadly in swedish only though :/

[@bakedbeansgarage116]

Yup, it will be covered in the next video. Thanks for bringing it up!

[@devogeding19]

Cool

[@bakedbeansgarage116]

It is now

[@xavizarate5366]

Were you an HVAC engineer??

[@bakedbeansgarage116]

Nah

[@timmotohus5637]

LOL at 39:04 mark 😆

[@75jrk]

Please keep the heat off the giblets!

[@eddieh5356]

promo sm ✌️