Ive been following this thread for some time now and am just about to install the HR6 compressor with the new switches as described above. Currently I have the MT0671 and the MT0678 switches in the compressor which were described.
Now since they have changed the switches from the single wire to the 2 wire I am a bit confused on which wire to use to properly connect it. So just to make sure that everything is done correctly I have a few questions:
1: For either of the 2 switches does it matter which wire is the ground or is it specific? *FOUND ANSWER* must have missed it
|Originally posted by randye:|
To wire them into the OEM harness is fairly simple. You will just cut the original single switch wires on the car, (do one at a time so that you dont confuse the high pressure cutoff switch with the fan switch), and simply splice in one of the two wires from the new switch plug.
The 2nd wire from each of the new plugs is a ground wire and you should run each of these wires to a good ground on the chassis or engine block.
NOTE: It doesnt matter which of the 2 wires you choose to splice into the harness or run to ground. Both switches simply complete or interrupt a circuit to ground. The reason for the 2 wires on the new switch connectors is that the old single wire switches grounded through the body of the A/C compressor and the new switches do not. Therefore the separate ground wire is required.
2: If the ground wire needs to be connected to something on the High Pressure switch where would be a good location to connect it?
HR6 Compressor related question:
Since the HR6 comes with oil I will imagine that it comes stock with the PAG150 oil. I have flushed the lines of the system but am concerned to the impact of the oil with the old mineral oil that was probably in the system during the old R12 days that may still be present in the evaporator core and possibly the condenser. Will this have any affect on anything in the system?
I may have other questions so I thank you in advance
[This message has been edited by RyuKyu567 (edited 04-10-2017).]