rad coolant

[hardeeharhar]

when i first start the truck in the am and it is cold out, there is a little a/f on the driveway but as the truck warms up it stops. is it a good i dea to put something like barrs leaks or some other sealant in the rad for a leak like this? i think it is coming from the seam.
scott

 

[BradE.]

I would not add anything to the coolant, it just clogs the radiator anyway. Check out everything and find the leak, then go from there.

I had a similar problem, tracked mine to a broken heater control valve, cost $17 to replace.