Heat ventilation system?????

[guy_geo]

OK. I'd like to know if the third lever (the last one close to the console) is supposed to send some warm air in the cabin when push to the far right???

problem is (in fact, don't know if it's a problem) when the lever is in that far position, I still have fresh (cold in the september morning in Montreal ) air comingout of the 2 rounded vents on either side of the dashboard..

Maybe there is a lever/cable broken behind the dash???

Help me please!

:sick:

[EScanlon]

The side and center vents never expel heated air. They are strictly for ventilation or recirculating the cabin air.

The top lever actuates 2 controls; the fresh air vent flap, located behind the blower motor, and the internal flap that directs the fresh air to the heater core and then out to either the defrost tubes or the flaps at the bottom of the heater for heating the cabin.

The middle lever actuates the hot water control valve on the right hand side of the heater box.

The bottom lever opens / closes the side flaps on the heater box to either force the air up the defrost tubes or into the cabin.

The top lever has two cables. One goes to the right and it's fairly long, the other is short and is on the left. The one to the right, goes down, underneath and behind the blower to the fresh air vent (the floor of the windshield wiper tub). The one on the left, connects to the left side of the heater box and it actuates the flap that directs the air coming in from the blower to either the 3 vents on the dash, or down into the heater plenum inside the box.

The middle lever has the next longest cable, and it goes out the right hand side to the right hand side of the heater box. There it moves the water control valve lever.

The bottom lever has one cable, medium length, and it goes on the left to the bottom and rear section of the heater box. There it controls a lever that opens / closes the side flaps on both sides of the heater box. By opening, it allows the air that has been pushed through the heater core to exit the heater plenum and into the cabin (room in Datsun parlance), down there by your toes. When closed, the air is forced into the defrost tubes that exit at the top of the dash just below the windshield.

In summary:

The center and side vents can either provide fresh air from the outside or recirculated air from the cabin, which is collected down by the passenger foot well. (This is important if your passenger has taken off their shoes and they have smelly feet.)

You can get heated air EITHER through the defrost tubes, or down by your toes, not both. (Again important to note that heated smelly toes can make the smell worse.)

The amount of heat you get is regulated by the valve AND the condition of the heater core. If the valve is inoperative you get no heat. If the core is plugged, almost plugged internally, there will be no movement of the water within the system. Also, if over time debris has collected on the top of the core (dirt, leaves, etc) there won't be any way for the air to go through the heater core. Don't forget that the water valve pulls heated water from the engine AFTER the thermostat. If the thermostat takes a long time to open, it will be a longer time to get heat in the car.

So, to get heat, Top lever to the right, Middle lever towards the right to get the water moving, and the bottom lever depending on whether you want to heat your toes, or the windshield.

Hope this helps.

[guy_geo]

Weel could'nt be more Cristal clear.. I must be numb!!!!

Thans for the nice details and the rotten toes!!!!

Ah these french Canadians....:stupid: