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The heater valve is located under the leaf trap. Open the hood, and remove the plastic grille which sits on either side of the windshield wiper. Valve is on the passenger side and has a red vacuum pipe coming out of it.
See if it holds vacuum.
I have a web page which can help troubleshoot this system:
http://cacavas.com/mb/TTM.html
Good luck,
John Cacavas
Los Angeles, California
jcacavas@gmail.com
What else can I help you with?
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