Thermo time switch - MBWorld.org Forums

Oct 23, 2005 | 02:52 AM

bcmbcmbcm

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From: Orange County, CA

380 SEL 1982

Thermo time switch

Can anyone explain what the thermo time switch does and where is it located on a 380 SEL?

Thanks!

Oct 29, 2005 | 10:56 PM

w123_w126

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From: Florida

85 500 SEL

It controls the cold start valve, shutting it off at 42 degrees F.
It’s located on the upper part of the intake manifold.

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Thermo time switch-thermo-time-switch-2.jpg

Oct 30, 2005 | 11:23 AM

bcmbcmbcm

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Joined: Mar 2004

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From: Orange County, CA

380 SEL 1982

Thanks! What does the cold start valve do?

What does the cold start valve do? What are some symptoms if either is failing?

Oct 30, 2005 | 02:04 PM

w123_w126

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From: Florida

85 500 SEL

The CSV introduces additional fuel to a cold engine to aid starting and warm the engine faster. Hard starts in cold weather with a cold engine and flooding in a warm engine are two common symptoms of failure.

May 3, 2006 | 04:13 PM

bcmbcmbcm

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Joined: Mar 2004

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From: Orange County, CA

380 SEL 1982

what if the engine runs WORSE when warm?

I have figured out that my engine runs like a champ when ice cold, but when
I reach 40 degrees I get a little off idle hesitation. I have changed my thermotime
switch. Does this mean that the CSV is at fault? Is it simply 'on' (more fuel=more power) or
'off' or are there variable levels of operation?

Also, can I bypass the CSV so I get max fuel all the time?

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