79jasper
Chickenhawk
Yes. Think of it as a electric thermostat. Lol
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High Idle Stays On At Operating Temp.
- Thread starter rsaltaresjr
- Start date
What is side effect of it not functioning? Mine has been broken for almost a year.
madpogue
Full Access Member
Just the opposite. Switch is CLOSED when cold, and OPENS when it reaches the appropriate temp.
No high idle and no extra timing advance when cold.
Mine was stuck closed, so I unplugged it. I ran that way for about 2 yrs with no issues. I wired up a switch for a while, but then when I was rummaging around working on something else I I did something to the wiring which caused me to blow one of the fusible links by the passenger side battery and toast the switch. I went ahead and replaced the sensor the next time I did the thermostat. I don't remember what I paid for it, but I think it was somewhere around the $35 range.
Also, mine is a van, so it is a real pain to get at the sensor wiring to add a switch with the thermostat housing still on,
Also, mine is a van, so it is a real pain to get at the sensor wiring to add a switch with the thermostat housing still on,
madpogue
Full Access Member
^^^^^ It's not much better in a truck. The way the t-stat housing goosenecks backward, it's about impossible to get a socket on it. Maybe the 7.3s are different, but on my '85, it was a PITA.
79jasper
Chickenhawk
I swear I read it five times, because the way it was worded. I was sitting there saying cold, closed, on. Hot, open, off. Lol
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madpogue
Full Access Member
... and of course a valve is "on" when it's open and "off" when it's closed.....
icanfixall
Official GMM hand model
Normal operation of this "switch" located behind the thermostat housing is.... Closed so power flows thru this to the fast idle cold advance.
When the coolant reaches around 120 degrees the "switch" opens shutting down the flow of power to these two items...
So who can say this is normally open or closed... Surely its open much more than it closed.. Kinda like the gas carb has a chock thats normally open but.. It sure is cutting off the carb air flow during a cold start...
When the coolant reaches around 120 degrees the "switch" opens shutting down the flow of power to these two items...
So who can say this is normally open or closed... Surely its open much more than it closed.. Kinda like the gas carb has a chock thats normally open but.. It sure is cutting off the carb air flow during a cold start...
madpogue
Full Access Member
It's normally closed. It takes an action (heating of the coolant) to open it. _Normally_, the coolant is at a temperature that does not open the switch.
(Weird, this never posted the first time yesterday (shrug)...)
(Weird, this never posted the first time yesterday (shrug)...)
rsaltaresjr
Registered User
Oem Ford E8tz9e939a Engine Coolant Temp/Temperature Thermostatic Switch https://www.amazon.com/dp/B0042KYF50/ref=cm_sw_r_cp_api_ig6yAbNR06DSX
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