Can’t find coolant leak!

Take it to a shop.

Tell them to pressure test your system unless you know how to do it yourself.

If you or he leaves that connected for a few hours, you'll see leaks you never dreamed of.

 

You hit the nail. It’s a cold leak. Considered normal on New Trucks, silicone hoses, always leak while parked. Takes a while, and a maybe few snugged up clamps before they seal up. Even an older Truck, cold snap causes negligible minor coolant and air leaks to become noticeable.

 

Yeah that was always a thing I checked over on my truck every time we had the first cold snap of the year. On the new Freightliners it gets blamed on them being made in Mexico but probably is mostly a case of them being snug and not dripping in a warmer climate down there then in cold snaps up here the leaks start.

 

My Dad would get a new Truck every year. Silicone heater hoses were a new thing. About 1995, I’d say. When he was off at home, often needed to add a gallon. First time I heard the term Cold Leak. The fix according to one Dealer is constant tension clamps. Takes a while for the hose to get the silicone to get stuck on good. I quit using them too expensive and overrated. Good for compressor air inlet and CAC boots. Radiator and heater hoses, not really. Regular type last a good 5 years. That’s long enough. Time to flush, change thermostats, anyway.

 

Doesn't FL use those chicken #### plastic clamps?

 

At every service I do, I snug up the all the clamps are the engine(hoses). I don’t over tighten them, just a little turn or whatever is needed.

 

Yeah it's by feel don't over do it.

No