Quote Originally Posted by Margo_325 View Post
Thanks, but I already subscribed as a member to alldata myself. Now I got the heater working (need to find the A/C engage wire, but I have some small problems left still. First, how should the coolant circle go through the heater? I have 3 pipe endings coming out from firewall, one I know is A/C pipeline, the other two are for the heater inside.
http://stuff.e30club.org/images/suburban/hoses.JPG
Problably the bigger one is intake hose and smaller outlet? Duramax has two exactly same size hoses, one is coming from the waterpump or near there and the other one is coming from that big hose, that goes to the radiator right side. Correct me, if Im wrong, but then the hot water comes from the lower hose, that goes to the radiator, goes through heater radiator and then goes back to the water pump? Of course, then it gets warm in car, when thermostat valve opens. And also I have A/C hose problems, if someone could explain me the schema, how I can fit them so my A/C fluid circle will be right. If someone can explain me, how I should fit those hoses, I´d be very grateful.

Edited:
Still one more little problem: I have that kind of wiper plug, that does not fit to the suburbans wiper motor, and it has 6 wires, but suburban has only 5, so any ideas? The Duramax wiper motor is different and cannot be mounted on the suburban body.
Picture of my plug:
http://stuff.e30club.org/images/suburban/wiperplug.JPG
In my 1989 Duramax conversion, the heater pipe closest to the engine on the truck's firewall connects to the upper heater supply hose coming from the Duramax engine. I bought a new silicone hose made for a 6.5 engined truck to sweep up and connect to the Duramax heater hose supply line.

Wipers... I used a new complete in-cab wiring harness, and I maintained the original steering column. Using the 2001 harness wires used for the wipers, I made the connections between the wiper control stalk and the wiper motor (using the original electrical connector) using the 1993 wiring diagram. If your vehicle is newer and you're using the original steering column, use the matching wiring diagram to know what function each wiring connection is supposed to operate.

Are you using the original steering column or a column matching your engine package (which is what I recommend for an easier install)?

Jim