Water Temp Sending Unit?

[Dave5Cs]

There should be two "senders" (one is a sender, the other is a switch) in the right hand thermostat housing, and one switch in the left hand thermostat housing.  The switches on my MCI 8V-71 have red domes under the terminal, and an ohm-meter reads open to ground.  They (Gumpy calls them Tempstats) switch and ground out the terminal when they get too hot.  The sender has no dome, and should read around 150 ohms to ground.

Brian

Brian wrote about the red domes above?

[PNWorBUST72]

MCI told me yesterday that the red one is supposed to be an Alarmstat, one on each side.  The part is the same as the one on the other side but it looks completely different then the one in that space now.  I am not sure

Here is what the original one on the driver side looks like...


The Maintenance Manual shows a very similar part on both sides too...

[gumpy]

Yeah, there should be one on each side.

You also need to figure out where the wire went to it.

And I'm wondering what that aftermarket sensor is with two wires going to it that looks like it's in the water pump outlet.

[PNWorBUST72]

The one with two wires on the drivers side I am told is the fan controller, feed it power and both fans turn on.  Not sure if thats a stock unit or process...

I got the "alarmstat" from MCI  and it looks just like the red covered one...but now the one I pulled out and I thought was an alarmstat is much different so...what the hell is that 4in long "Cadillac" part I showed a pic of?

Always a struggle to do things right I guess...I will keep chuggin.

Thanks for your help all...

[chessie4905]

good possibility that the larger one is older and Kysor shrunk the package size at some time.

[gumpy]

The one with two wires on the drivers side I am told is the fan controller, feed it power and both fans turn on.  Not sure if thats a stock unit or process...

What?  Your bus has electric fans?  Post some photos of that setup.

I got the "alarmstat" from MCI  and it looks just like the red covered one...but now the one I pulled out and I thought was an alarmstat is much different so...what the hell is that 4in long "Cadillac" part I showed a pic of?

Probably aftermarket replacement. They typically are the same part. They're just a switch which turns on at a certain temperature and triggers the safety shutdown wiring system.