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The 22mm x 1.5 thermostatic fan switches are used by numerous VW cars.  You can pretty much get any temperature rating you need.  Perhaps there is no need for an adapter.

It looks like Fluidyne for Pantera uses the same switch.

You can use different temperature ratings for the inlet and outlet.  This can allow the second fan to turn on and off as needed.

If you are changing to the single PE temp sensor , you only need the top access hole for your sensor . The standard radiator has two locations for the two original sensors. The original sensors will be very tired as will the mounting studs in the radiator. if you can get the nuts off the embedded studs in one piece then pulling out the old sensors is easy. Try not to break the studs. If you do you will have to drill and tap into the metal base boss surround  and put in another stud.

You could have a special cover plate made and drilled for the second opening or get two of Jons treaded adaptors , one for each sensor opening. and put a flush SS or HD plastic  plug in the lower one. The size and thread is the same as a standard marine deck drain plug, so easy to get.

Hi Mike -

I am pretty sure I have a Hall Phoenix radiator too, but the second adapters that Larry F. posted from PE looks like it’s too small for the sensor currently in the radiator.

I am not near my car right now, but will try to get a picture of my sensor and maybe you can tell me if they’re what you have.

I don’t want to pull my sensor out of the radiator and then find that I am down while I’m looking for the correct adapter.


Rocky (a.k.a. Chuck)

Here is the setup that Jon Haas (Pantera Electronics) has engineered.  It uses one sensor on the outlet.  The controller (box where relays are usually mounted) begins turning on the fans at 140 degrees.


I met Jon yesterday at Wilkinson's shop and he explained the setup to me.  After understanding it I bought one.  Here is what it does.

> Efficient proportional fan speed for radiator temperature control, fans consume less power, less load on alternator and battery.

> Utilizes power semiconductors to control fans ... NO contacts arcing during turn on or turn off.

> Fan operation is delayed 12 seconds to allow starting engine without the fans loading the battery.

> 7 Indicators, "READY", 50% SPEED, 60% SPEED, 70% SPEED, 80% SPEED, 90% SPEED, 100% SPEED.

> Activates amber light in speedometer when fans are ON,  flashes amber indicator when the fan fuse is open.

> Ramped fan speed to minimize voltage drops due to high current in-rush.

> Only (1) temperature sensor is utilized, electrically insulated from coolant and radiator, no galvanic action.

> Control terminal to enable fans at maximum speed for forward mounted air conditioner condenser.

> Simple wiring and NO additional diodes needed, diodes reduce fan motor voltage 10% and decrease air flow


Images (1)
  • 9A5A7361-BEFF-4CF4-9411-468DDD4FD95D

Thanks, John.

I have the second adapter that Larry posted.  It just looks like the sensor that I have on my Phoenix radiator is much bigger than the threaded end of that 22mm adapter.  And my radiator doesn’t have the little studs.

I need to do some more measurements.

To Mike - I don’t believe the PE temp sensor is a simple “On/Off” switch.  It’s a GM sensor, and it’s probably a thermistor (variable resistance proportional to temperature).


Last edited by rocky

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