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What does temperature control knob actually control? And what does the valve under the hood do? 900 1994

I am confused. While trying to track down a vacuum leak, I put a golf T in the vacuum line that goes to the water control valve under the hood. I then expected to lose control over the temperature of air to the cabin. However the temperature control knob is still regulating the temperature to the cabin. What does that knob control? So do I really need the valve under the hood?






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New What does temperature control knob actually control? And what does the valve under the hood do? [900][1994]
posted by  Philip  on Fri Oct 16 02:53 CST 2009 >


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