Throttle body coolant bypass problem

2005 FX35
I'm in Florida so I am bypassing and blocking off the coolant lines to the throttle body. I used a 3/8 inch silicone coolant line cap on the hard to get to coolant line at the rear of the engine. I put a stainless steel clamp on it. The cap did press on very easily. I can't get it to stop leaking. Should I have used a 5/16 inch cap or is there a better was to seal it? Thanks
 
Back
Top