A few blokes have been asking about how possible it is to run the Mk3 A/C in a Mk2.

I have done this conversion in the past by leaving the Mk2 heater and ac box in the car and getting hoses made that have the Mk2 A/C fittings on one end to connect to the box and Mk3 fittings to connect to the compressor on the other end.

However, today we got a Mk2 Heaterbox and a SEAT Cordoba heater box and split them both in half and joined the 2 pieces together. This gives us the MK3 / SEAT Fittings inside the airbox and a newer ac radiator coupled with the heaterbox which will connect to the Mk2 heater outlets. And be controlled by the Mk2 heater sliders.

It pretty much just fitted up, we had to cut a couple of Tabs off the SEAT box so they didnt foul on the Mk2 unit and then the two fitted together.

All the hose outlets through the firewall fitted, except the drainhose, which we simply cut off short and then used an angled bit of hose to go through the firewall and factory gromet.

We used the Mk3 fan and spliced the two wires into the Mk2 harness, that was the only mods needed to the wiring.

Pics

Mk2 Heaterbox removed from car
Note early type hose fittings



Split Apart like this



Reassemble with Mk2 centre section and SEAT Cordoba ac / fan section
Note later metal hose fittings



This conversion will allow a neat ac compressor continuous belt setup in the engine bay, a more powerful and easier to get compressor and a conversion from the early obsolete gas to the new type.

We will use all Mk3 gear on the engine, mounting bracket, alternator, air compressor, crank pulley and power steering bracket and pump. And of course the later Mk3 / Seat hoses.