Thanks Mark! 
I got a new radiator a few years ago, & dont remember if the switch was updated over the original, so we’ll see what the old one says. The switch part on the one in place is light blue, the new one is black FWIW. 

Sent from my iPhone

> On Aug 23, 2021, at 11:38 AM, vw_van_fan_Mark <madvws@cox.net> wrote:
> 
> The new switch you have is the standard replacement temp range.
> 
> The "wrong" switch turns on the fan at lower temps than that.
> 
> The early watercooled vans used one that turned on at higher temps than your new one.
> 
> Bentley page 19.12 shows the original factory temp switch ranges for waterboxers.
> 
> After you replace it, look closely at your old one to see what temp markings are on it.
> 
> Mark
> 
> Tom Buese wrote:
>> My thermo switch is bad & I have a new spare that is rated 85-93 degrees C. I read an old post from Mark Drillock talking about the several different switches that were available 12 years ago & a problem w/ using one that operates at a lower temp thus causing the #7 fuse  to overheat & melt the plastic around the fuse holder!  I dont want to install my new switch if that is the wrong one!
>> Do I have the best switch or did I get the wrong one? Inquiring mind needs to know before another 500 mile RT on Friday! TIA!
>> 
>> Sent from my iPhone
>> 
>> 
>> Sent from my iPhone
>>