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Your photo is a little dark to really see what you are referring to. If the 'dark adjustment' you're talking about is the temperature control, you'll have to explore how it connects to the heater coolant control valve. Under the hood or right in front of the heater core in the heater plenum should be a control valve that meters the amount of hot coolant that enters the heater core. If this valve is controlled by a push/pull cable in a sheath, make sure it's connected at the dash control and the valve handle and it moves as dash control is moved. If it's controlled by a vacuum controlled valve, make sure all vacuum hoses are connected. Using a vacuum gauge or hand held vacuum pump can be attached at the vacuum control and test it to see if it works properly.
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Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI