5th Gear Member
Join Date: May 2008
Location: San Francisco, CA
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the BLUE CONNECTOR- that is your THERMAL TIME SWITCH (wires=black-red/black-yellow) connects to Injection Control
the BROWN CONNECTOR- that is your temp sender. ( *note: it has only 1 wire. Disconnected, your temp dash meter read zero. If you ground the wire, your temp meter should be in the red zone)
on the thermostat head, you will also find the COOLANT TEMP SENSOR. (wires=green-red/brown) connects to Injection Control & Idle speed control module
the other sensor on your t-stat head is the EVAP TEMP SWITCH(wires= violet/black-white) connects to idle speed control module and A/C
TIP: check fuse #9... that is your idle control/vacuum advance fuse.
THERMO TIME SWITCH dictates idle control to be at higher RPM on start-up and bumps down the higher RPM to normal operating RPM once an acceptable operating temp is reached
COOLANT TEMP SENSOR communicated to the injection brain, the ambient temp of your engine... in order that your cold start injector can activate; and also increase idle via your idle speed control module during cold temps and on start-up
* correlatively, you have a zero degree temp switch mounted on your firewall that works in conjunction with your coolant temp sensor(wires green-yellow/blue-green) same operation... at lower temps, it will work on your injection brain and idle speed module to raise RPM.
EVAP TEMP SWITCH is connected to your Idle Speed Control Module and responsible for the "idle-up" functions when you turn on your A/C.
TEMP SENDING UNIT works independently and connects to your guage & an input voltage.
Last edited by darkhorse737; 06-25-2008 at 09:28 PM.