Anyone know the i.d. of rad hose

[general lee]

Looking to get the id of the rad hoses for a 2001 jetta tdi. Wanting to install a in line heater that circulates the coolant fluid for winter plug in's. Instead of using a block heater.

 

[oilhammer]

31mm.

 

[general lee]

thanks

you are the man, you know these cars so well, I'm always impressed with you knowledge.
thanks again