Hey guys, we have a strange cooling problem on our recent 82 Capri build. In summary, when we drive the car and bring it back to the house, the upper radiator is SUPER stiff, the stiffest I've ever felt. In fact it's so stiff it pulls itself away from the radiator slightly. I had to put a new radiator in the car today because the first two stock radiators developed pinhole leaks in them... I figured it was because I had left them sitting outside for a year exposed to the california elements and they were corroded/ blocked inside
I used a new 16lb radiator cap with both stock radiators, but for cheap insurance I installed another brand new 16lb cap in case the first one was bad. It definitely seems the cooling system is over pressurized.
1. The car does not overheat really ... sometimes it may creep up on the gauge which might be due to our hidden problem, but even after beating on it HARD it does not boil over or go past halfway up the stock gauge
2. no steam comes out of the tailpipes, so the head gasket is not severely blown even if it is
3. We are using a Stant 180 degree thermostat (new), that I did not test in a pot before installing it, but I am quite certain I installed it correctly.
4. The intake manifold that we are using is a used Weiand Stealth that was port matched before we got it ... I *might* have noticed a miniature hairline crack somewhere somehow in one of the ports (can't remember if it was water or intake port) but I blocked out any voice in my head telling me I should get a new one given that I had paid good money for it...
5. radiator is brand new, can't be bad
6. water pump was used from the junkyard but looked basically new (Bosch replacement from Pep Boys), and spun freely and does not weep ... and it came from a Serpentine belt car so I know it's not reverse rotation.
99 GT40-P motor, 62k out of a Mercury Mountaineer, we did not pull the heads off the motor, simply put a used Weiand intake on it...