How old is your rad? How clean is it when you look in the top?

It’s easy to tell when the stat is open and coolant is flowing through the rad with the cap off. It will flow by the cap opening really well if you leave enough of an air pocket. Something you’ll never see with that “burp” funnel sticking in the hole…..

When I fill a cooling system I fill until I have a 1” gap under the cap and start the engine, and leave the cooling fan off. Just the heat lever on max temp.

As the air pushes out I keep adding coolant until it stops dropping. As the engine warms up and the coolant expands….when the level hits the top of the rad I’ll put the cap on.

When you say “turn them off” are you turning off the fan and putting the temp lever to cold or just turning off the fan?


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