Re: [DML] How does the thermotime switch work?

["Todd Nelson" <tan5732@xxxxxxx>]

Derek:

You're right, the switch is grounded through the threads to the water pump, 
take the tape off, the sealing ring should be enough to keep it from 
leaking.  You can put a continuity tester between one of the leads on the 
switch and a ground point and if the engine is colder than 95 degrees it 
will show continuity.  I can't say which lead is the ground one, they both 
look the same, the other is from the starter solenoid to prevent flooding. 
Current from the starter solenoid during cranking heats a bimetallic arm in 
the switch to break the ground connection, thus disabling the cold start 
valve.  Take a look at the technical manual for a schematic of how the 
switch functions, it's pretty simple.

Todd Nelson
1561, Vermont
http://www.rit.edu/~tan5732


----- Original Message ----- 
From: "Derek" <derek.grozio@xxxxxxxxxxx>
To: <dmcnews@xxxxxxxxxxxxxxx>
Sent: Sunday, June 25, 2006 11:41 PM
Subject: [DML] How does the thermotime switch work?


>I recently did a valley of death teardown and now the car seems to have 
>problems starting
> when cold. The only thing I really touched thats involved in the hot/cold 
> start circuit from
> what I can tell is the thermotime switch. I removed it from my old water 
> pump and replaced it
> in the new one. My question is, does the switch threads use the water pump 
> as a ground? I
> put teflon tape around the threads before reinstalling. This is my only 
> idea so far, as I do not
> know how this circuit works (what is being sent and triggered by the 
> switch) and haven't
> pulled out the multimeter yet to check it. Any comments are appreciated, 
> thanks.
>
> -Derek #10084 






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