radiator flush
 

Has anyone used the Prestone Flush 'n Fill Kit? Also I think its n the back of the throttle body there is 3 vac hose line inputs I only have 2 used is that right?

RE: radiator flush
 

It would be a good idea to post year, model, etc., so people can help.

Also, are you asking if the Flush 'n Fill uses one of the vacuum lines you're refering to? The kit uses one of the heater hoses.