The Plastic Lizard

So my 84 has a thermal switch between #6 and #8 plug, but it looks like it's broken or about to break...came off really easy.

But it also has a thermal switch between #1 and #3 plugs.

I have seen conflicting information on where it is supposed to be, but since I only have 1 fan, which one is correct? Does it really matter? I would prefer to disconnect the one on the passanger side and just use the one between #1 and #3 as its easier for me to get to.

With only 1 fan, that isn't controlled by the ECM, does it matter?

qws

coolant temp sensor to ecm is by the water neck
Fan switch is between 6 and 8
coolant sensor for the dash is between 1 and 3

The Plastic Lizard

thanks....what is the sensor on the back of the AC compressor? It has the same round type connector?

qws

It shouldn't have the same type of connector, the only thing I can think of off the top of my head is the knock sensor connector may be close but I could be wrong.
I'm not looking at my FSM to give you accurate information on the sensor your asking about but if I were to make a guess I would say that sensor is monitoring temp or pressure to engage the clutch on the A/C compressor.

Best investment you could ever make is a FSM from Helms

The Plastic Lizard

I have one, but can only find reference to it in the engine electrical section. It shows the one between 1 and 3. I don't know where the other one is, but I'll trace the wiring diagram tomorrow.

Ray Quayle

There is a fan switch on the '84 Compressor. Maybe these will help. They are from your 1984 manual:

qws

That should help him Ray..


The electrical section of the FSM is actually a seperate book, about 100 pages or so.

The Plastic Lizard

Thanks, I hadn't made it to section 8 yet.

The connector I was talking about is the one labeled as engine cooling fan switch connector in 8a119.

SunCr

You need a fan running when the a/c is on because what's in the Condenser has to be cooled/maintained at around 100 degrees or 200 psi. Your system relies on a high pressure switch mounted in the Compressor outlet which is spliced into the Fan Relay Circuit. That sensor closes with head pressure and that cranks on the Fan. If it doesn't turn it on, it will blow a hole in something if the High Pressure Limit fails - also mounted on the Compressor.