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Can you help me locating the cold start valve "relay"on my 1976 Mercedes 450 sl . I look for it every where could not be found any where. Can you help please. thanks
 

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1998 SL500, 1959 220S, 1970 280SL
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That's true, but there is also a cold start valve, controlled by a "thermo time switch" that measures coolant temp and controls how long the valve squirts by supplying ground. They are both at the front of the engine.
 

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1975, 280SL
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According to the wiring list you don't have a cold start relay per se. It's a combination "relay, fuel pump/warm up control". Should be under the dash on the passenger side. Look for the relay with a large violet lead.
 
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