That is how I test my leak detector- take off the caps and make sure it works...Then put caps back on.

Typically all air flows through the Evaporator first, then gets directed through the heater core if warm/hot air is requested. It is diverted around the heater core if cool/cold air is requested. This is so while in defrost mode, dry air can be used on the windshield. So if you can't decide if it is...

A new condenser comes with a new OT in condenser outlet- make sure you don"t also have one in-line in front of Evap.

Be careful-- lots of outlets call a 3-wire transducer a "trinary switch" Seen it many times. A transducer tells the ECM the exact pressure and the ECM decides when and how to control fan(s) etc. In a three-wire transducer, one wire is ground another is 5volt reference and the third is the ...

I can remember on a 1991-94 GM Pick-up truck with the R-4 compressor a high-pressure switch mounted in the back of the old R-4 compressor that activated the recirc door automatically at about 250 psi pressure. Most all complaints were that the fan goes into a High-High speed on its own, and owners c...

Seems kind of silly to have pusher fans running when driving 60 mph down the road- Also if wiring into the compressor circuit, the spinning fan(s) will back feed the compressor clutch- providing current when the compressor is not running because they generate current by free-wheeling in the wind. Th...

Yes, that ERA of GM trucks had the same fitting on both the inlet and outlet of the condenser- easy to mix them up- seen it many times-- always remember that a condenser cools the hot gas in and it changes to a liquid as it flows downward to the outlet- where the OT usually is.

I've seen equalized Low side/High side pressures of 275psi at Lake Havasu AZ at 120 degf ambient,sun-soaked hot engine shut down in Pontiac Formula doing hot soak testing- Black painted car- so yes the evaporator can take it.

Yes, head pressure is high with two OTs in system-- go with factory method of using the OT in the condenser outlet only if it is a front only system! Aftermarket only wants to build one condenser for all Utility vehicles and let the mechanic figure out if it needs an OT or not. I've seen new condens...

Biggest problem I've seen with dual systems is having two orifice tubes installed-- Those condensers all come with an OT in the outlet- yet a dual system has it's OT just beyond the split in the liquid line to the rear. So make sure you don't have an OT in the condenser outlet- and you do have one i...