Before hooking up the hoses, observe that the defroster core and motor on the driver’s side firewall has three pipes pointing downwards. Two of these pipes are on the inboard side of the defroster, one of which is in front of the other. The third pipe is at the outboard side of the defroster.

Directly under the defroster, sitting on the frame rail, is a T shaped pipe fitting (to which hoses will be connected). The T connection sits on the frame in an upside down position, something like this ?, with the axis of its bottom facing longitudinally toward the front and back of the car.

From the pipe connection at the back of the driver’s side cylinder head, a short hose goes through an L-shaped elbow pipe (which looks like this: ?) to the front pipe of the two inboard pipes on the defroster. From the back pipe of the two inboard pipes on the defroster, another hose runs under the car’s body to the driver’s side under-seat heater. A third hose runs from the outboard pipe on the defroster straight down to the upward facing pipe on the ? (or T) connection. (See the photo on the next page.)

From the second pipe on the driver’s side under-seat heater, a hose runs across the top of the frame to the passenger’s side under-seat heater. From the second pipe on the passenger’s side under-seat heater, a hose runs back over the frame to the driver’s side of the car’s underside, and then all the way to the backward facing pipe on the ? (or T) connection. Another hose runs from the front facing pipe on the ? (or T) connection, up through a clip on the inner fender, to the pipe on the left side of the water pump.

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Repairing Heater Control Valves

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