[bd1308]

There is a THERMO TIME sensor under the plenum with a heating element installed. Its a dual circuit, meaning that when you start the car two things Happens.

But lets look at the reason why this sensor is needed.

In cold weather when the engine is started, the ECU sends a signal to the thermotime switch to heat up the internal element.

That's the THERMO part of the switch.

Now the time switch comes into play the instant the engine is starting. The switch is being heated at a certain degree, and depending on how COLD it is when first started, there is a mathematical function that relates the OUTSIDE temperature to the amount of TIME the sensor stays on. Basically, the colder it is outside, the longer it takes for the sensor to heat itself to some precalibrated value, and therefore the longer it stays on.

In essense, with this circuit somehow broken and the 2nd part always connected, the sensor stays on, therefore flooding out the plenum in short order. Usually there is either some corrosion at one of the crimped terminals or there could br a break in the wires going to the thermotime switch.

What I would do first is to take the connector off of the CSV and verify that thsi in fact the cause, next I would test the connections at the connector for the thermotime switch (located UNDER the plenum--2 pin connector) and look for 12V on one side, that should be the heater, and then by grounding out the OTHER side, you should be able to control the CSV.

Inside of the thermotime switch is an internal heater, which was mentioned before, and then there also is a set of bimetallic flaps that open the circuit when the temperature inside the sensor reaches the precalibrated value.

Lemme know if you need more help

b