My Uncle bought a '91 pickup 4x4 with a 22re and a leaky radiator. We replaced the radiator last weekend and now he says that as the engine warms up a little coolant goes into the reservoir (this is normal, right? The same thing happens on my '90) but it doesn't return to the radiator when the engine cools down (it does on my truck). So he's been syphoning some coolant out of the res and refilling his radiator every few days. I don't know if there is a net loss of coolant because he's been syphoning it into a large jug of pre-mixed coolant and pouring that back into his radiator. I was hoping that there was a small air leak in the tube that runs from just under the radiator cap to the res so that when the engine cooled down it pulled a little air into the radiator instead of the coolant in the res but I put my finger over the hole just under the cap and blew into the tube that sits in the bottom of the res and there doesn't seem to be a leak.

Anyone ever had a similar problem?

Any ideas?

Thanks!!