Jan 28, 2006 Coolant hoses from a 1996 2.0L 5-Speed Jetta The power steer pump, brackets and all, bolted directly onto the 1.8T block. The water pump bolted directly on as well. Both items were from the 2.0L 1996 Jetta (mk3). I haven't been able to find info about anyone else using the mk3 water pump on a 1.8T, and maybe there is a reason for this, but I don't know it... Differences between the 1.8T and mk3 pumps seem to be the number of inlets. 1.8T has 2, mk3 has 3, and the 1.8T drain plug bolt. The drain plug bolt on the bottom interferes with the power steering pump bracket, and for this reason, the water pump does not bolt on. I've seen this bolt removed and the drain hole plugged to allow clearance: 1991 1.8T Swap With the water and power steering pumps in place, the mk3 accessory bracket slips right on. Found out the hard way: The AC compressor and alternator will need to be attached to the bracket before it is mounted in place... The bolts are too long to clear the bay wall to the left. The 2 of 3 mk3 stock hoses are in place. The bottom inlet has the stock mk3 lower radiator hose. The middle hose has 2 branches. One hose for rear/lower oil cooler (see the blue clamp), the other, which climbs up and out the top of this shot, connects to the metal water pipe the feeds the coolant reservoir, and heater core. Don't know yet what direction to go with some of the upper coolant lines. The 2.0L mk3 coolant flange does not fit the 1.8T head. Here, the stock 1.8T flange is attached. Fittings need to accommodate the driver's side heater core inlet, and turbo. In this picture, the mk3 hose attached to the heater inlet, but no where to go yet on the "flange" side. I think I'm going to need a modified one of these:Edit 02/01/2006: Maybe not, see the coolant hose diagram Completed today: - 4 hour gig at the junkyard. Coolant hoses & pipes, ac compressor, water pump, power steering pump, mk3 coolant flange, accessory bracket, and all required hardware: $70.43 - Attached mk3 accessories, lower radiator hose, and one coolant pipe. 02/01/2006 Coolant Hose Diagram Hoses are from a 1996 Jetta 2.0L 5-Speed unless otherwise noted. #1. Upper radiator hose, which clamps/connects the following: - the top water pump connection, (there are 3, see pics above) - the upper radiator outlet - the oil cooler (can't see it from this angle) - the coolant reservoir overflow (it's the thin hose flopped over on the oil dipstick) - the mk4 1.8T head flange (number #7) flange part # 06A-121-132-Q ($25.00) #2. Lower radiator hose - connects to bottom water pump inlet, and radiator #3. Heat core return hose- connects to the middle water pump inlet, which clamps/connects the following: - the oil cooler (can't see it from this angle) - coolant pipe (in the pic above, the red line for #3 is touching it) which works it's way around the head (can't see it from this angle, its under #1) - branches off to coolant reservoir, #4 - coolant pipe connects to the heater core return hose, #5 #6 Heater core inlet hose - it attaches to the mk4 1.8T head flange (number #7), from the back Close up of the mk4 1.8T head flange (number #7) Flange part # 06A-121-132-Q The bottom port is not mentioned in the above diagram, but it may be used for the turbo's coolant return line. Stock water temp sensor, form the original ATW engine's flange installed. (New O rings of course) The 2 flanges side by side. The ATW (and AEB style) flange is on the left.

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