radiator problem

[fast95atx]

i have cracked 2 radiators now....1 on the dyno and one out of no where.....could this be due to vibration?

 

[Xs SHO 1]

i've gone through 2 radiators in less than 2 years myself. its could be a possibility of improper mixture of the coolant and water in the winter time, freezes then cracks. our shos are known for going through radiators....