Gosh oh mighty, let me explain my situation. I replaced water pump, radiator and thermostat. The thermostat housing was ever so slightly warped, but appears to be holding up well. I have an odd coolant leak, last week after driving I parked the truck woke up and coolant had pooled in the valley to the left of the thermostat housing, my thoughts timing cover, thermostat housing, or possibily one of the TB hoses. Well I have since drove the truck around 70 miles and for the life of me can not get it to leak coolant again. I have simulated that night the best I could, I have driven it hard climbed hills parked in the same spot. I have put small cut outs of card board underneath the thermo housing, both connections on the TB coolant hoses and show no coolant leak and no more pooling. I did a pressure test, pumped it to 17 psi and after around 30 minute it was at 14 psi so there was pressure loss somewhere but I can not see a visibile leak, no coolant in the oil what so ever and I had a friend throw it on a sniffer machine to see if it was a bad head gasket or cracked block and there was absolutely no combustion gases in the radiator, also did a standard block test with the blue testing and no combustion gasses there as well. here is where I think it came from, also on the night it happened the weather was down to the 50's and it hasnt gotten that low since.
Yesterday infared on thermo housing was reading 203 degrees after sitting idle for 20 minutes. Bad Good?


these are the throttle body hoses, they definitely have signs of previous leak




I put a piece of paper underneath to see if it leaks from and havent had a leak since last week,

 

This may sound weird but its the reason I pulled my engine out and took it to the machine shop. If I drove it daily it would not leak until cold winters . Antifreeze and oil. It had over 330000 on the engine with ample power . Just got tired of it leaking . It was not my daily driver. If I drove it daily no leaks . It got so bad at times u could smell antifreeze , what little I drove it . Rear main oil seal,vavle gaskets, coolant puddling above water pump etc.... Seals in older cars ,trucks get brittle break and eventually leak . Good luck TR