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Caterpillar 3208 Solutions This sub-forum is hosted by Mike Hohnstein who has been at this kind of thing for 50+ years now, guess I'm addicted. The saga has been all about progressively larger shop space since then. Honestly, never wanted to get into the CAT 3208's that were originally considered to be a throwaway engine but that's all that works in a FC in my world. Same thing with my Ford toter, that came with a NA, too much effort to hang in a 6, so been at it with the CAT V-8 for 20 years now. In reality you can get excellent life out of a CAT 3208 if it's built correctly. Post your questions about the CAT 3208 engines here and Mike will try to help you out.

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  #1  
Old 05-19-2018
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kunzelj kunzelj is offline
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Default Radiator Sending Unit

Hello,

I'm about ready to put my newly rebuild radiator back into my '88 FC.

The top of the radiator has a T-fitting that connects to the coolant tank and to a sending unit with one wire.

I need to get a new fitting and sending unit. Does anyone know what this sending unit does?

It's only marked with a "K" and "LBX". See attached photo.

Thanks!
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1982 FC-33SB 250HP (2007-2009)
1978 GMC Royale 26' (2015-2016)
1988 FC-35SB (current)
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Old 05-19-2018
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Low coolant level.
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Old 05-19-2018
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That seems likely, but what light or indicator would that trigger on the dash? I don't have a low coolant light. Engine alarm?
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Old 05-19-2018
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Mike Hohnstein Mike Hohnstein is offline
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That 'T' is way over kill, all that's needed is one of these if checking level visually is an inconvenience.
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Old 05-19-2018
f.wernlein f.wernlein is offline
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If you ground the wire that goes onto the sensor (with the engine IGN ON)...you should get a dash light and/or buzzer. That will confirm your light/buzzer is working.

The sensor should be available from varied sources...KYSOR Water Level Sensor/Probe:

http://https://class8truckparts.com/...gaAt05EALw_wcB
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Old 05-19-2018
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The "T" on my 82 was plumbed into an air burp line on water pump it allowed air to be expelled from system quicker.
When the coolant on our 82 went "LOW" it ungrounded the sensor turning on the alarm my was a one wire sensor.
If using the "T" fitting use brass iron will rust keeping the sensor grounded = no alarm bad deal for sure.
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Old 05-19-2018
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Kysor Alarmstat.

https://www.wanderlodgeownersgroup.c...ad.php?t=22550

The module that controls everything should by your left foot sitting in the drivers seat on the steering column so to speak. Small black box, mine wasn’t buzzing when I’d start up but would buzz if I shut off the engine the turned the key back on to the accessory position. There is a time delay built into it so the buzzing doesn’t drive you crazy.
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Old 05-30-2018
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I got my coolant sensor in and installed it. Part number is 5022-01185-01

There are several brands. I'm going to ensure that my Kysor alarm is working though. Tough to tell when you only turn the key on without the engine running because the low oil pressure/engine alarm is already lit.

This is a very important sensor and your only protection against big repairs with a coolant leak which may go unnoticed until it's too late.

This is a well worthwhile test to perform. Ground out your sensor to make sure the alarm goes off. If the sensor is old, replace it.
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