[pavegeno]

Mine has worked well for years with the manual heat and the van fan. It's worth the trouble and expense to get it functioning. You also have two footwell blowers that boost the heat flow when you turn the rotary dial between the seats from 0 to 1 to 2 to 3 assuming you have manual heat. However, the two red levers should provide variable fan speed as you raise them from full down to full up. There are electrical contacts on those levers that, when raised, turn on the heater fan in the engine compartment. If your heater fan motor isn't turning on when you raise the red levers, you have an electrical contact issue with the red levers. Additionally, just raising and lowering the levers will provide heat flow even if the heater fan motor isn't working (either because it's fried, or the red lever electrical contacts are fried thus not signaling the engine heater fan to turn on). Raising the red levers opens the heater boxes under the car and as you drive faster and faster, more air flow comes in. Bottom line, get the electrical contacts at the red levers working which should signal the engine heater fan to turn on and provide you variable heat flow. Once you have both red levers working with variable heat flow, then get your rotary 0-1-2-3 dial between the seats working which controls the footwell blowers located in the kick plates by the passenger's right foot and left of the clutch pedal on the driver's side. The 1 setting is almost imperceptible in boosting the heat flow. The 2 setting is a little better. The 3 setting is definitely noticeable.

Now, on your HVAC panel to the left of your radio, move the red lever to direct the heat outflow. You can set it to the full right or full left which would direct 100% of the heat to either your feet or to the windshield defrost. Or, you can set the red lever anywhere in between full left or full right for variable feet heating or windshield heating. If you need more flow, turn your footwell blowers on setting 1, 2, or 3 to boost heat flow. It's quite an effective heater and defroster when you have the engine heater fan and both footwell blowers working.

For the vent fan, sounds like it's dead and needs replacing. Once you get that replaced, you have three controls to worry about. On your HVAC panel on the upper right middle you have a lever. That lever turns on your vent fan and is a multi-position lever that allows for increasing vent fan flow the further right you slide it.

However, and very importantly, the lever on the top left of the HVAC controls whether that flow makes it to your interior. If the lever is full left, even with the upper right lever full right for max fan speed, it won't let any airflow in. So, move that upper left lever to the right and it will allow that vent fan air to flow to the interior.

Next, use the lever above the red heater lever to direct your vent fan output to your feet or to your windshield or variable anywhere in between.

Another feature is with your vent fan and heater fans off, if you move the upper left black lever to the right until it's touching the upper vent fan speed control lever, outside air can flow in without activating the vent fan. However, if you are going to use the air conditioning in your car, ensure this upper left black lever is full left or else you will be allowing outside hot air to flow into your car and it will be fighting the air conditioning.

Good luck, when you get it all working, it is a very effective system. If you don't have working A/C, I have had a Griffith's system since 2008 and it is perfect in the Alabama summer.