The cliff notes would be this paragraph
"Basically, the E30 uses a heater valve bolted directly to the heater matrix under the dash which gives very fast response to the heater control. It’s a simple valve which sits between the heater matrix and the engine and with the application of a full 12 volts, closes the solenoid valve and thus shuts off the warm water supply and therefore the heat.
The temperature switch on the dash is a rheostat which alters the voltage going to this valve. When set to cold, there’s a full 12 volts on the valve, when set half-way about 6 volts mean- ing a half-open valve and when set to full heat, no volts at all."
and this sentence
"The switch on the E30 operates both the heater valve and the hot air flap in the heater box via a cable."
so that plus the hot air flap which controls direction of air (flow to the hand vents) and use realoem to find diagrams of the vent ducting and note that they flow from different parts of the heater box = fuckin complicated ass german shit
"Basically, the E30 uses a heater valve bolted directly to the heater matrix under the dash which gives very fast response to the heater control. It’s a simple valve which sits between the heater matrix and the engine and with the application of a full 12 volts, closes the solenoid valve and thus shuts off the warm water supply and therefore the heat.
The temperature switch on the dash is a rheostat which alters the voltage going to this valve. When set to cold, there’s a full 12 volts on the valve, when set half-way about 6 volts mean- ing a half-open valve and when set to full heat, no volts at all."
and this sentence
"The switch on the E30 operates both the heater valve and the hot air flap in the heater box via a cable."
so that plus the hot air flap which controls direction of air (flow to the hand vents) and use realoem to find diagrams of the vent ducting and note that they flow from different parts of the heater box = fuckin complicated ass german shit
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