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#1
01-03-2000, 05:36 PM
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I'm still searching for the reason my 350SDL is running hot under heavy load. I'm working my way towards the radiator testing/replacement but noticed the EGR valve this weekend. How is this tested for operation? Can I pinch the vacuum hose to it to disable it?
I see there is a tube that goes from what looks like the control switch to the cars interior. What is it? Door locks? 
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#2
01-04-2000, 09:34 AM
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EGR valve is there to help with emissions, part of EDS system. The EGR system won't cause any overheating. Radiator & or other engine componets will cause overheating, head gasket leakage is common on this engine.
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#3
01-06-2000, 10:52 AM
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Is head gasket leakage common on the 300SDL as well?
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#4
01-06-2000, 06:34 PM
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What causes the head gasket failure?
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#5
01-06-2000, 07:56 PM
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Head gaskets on aluminum head diesels are subject to more stress than any other car. Any over heating will cause premature failure. The engines uses stretch bolts & they are designed to keep the head secure to block. Stress from combustion heat is a common reason for failure. Show me a car w/over 200k miles & most likely the h/gasket has been replaced.
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