I have a customers 01' IH4700 with a DT 466E that is building alot of coolant pressure. truck was brought in for CEL being on. other tech stated it was over heating however it was pushing out coolant rather than boiling over. truck did not reach 140 degress and was pushing coolant out around the resievour cap. tech said the air compressor 'must have been bad allowing air pressure to build with in the cooling system (anti freeze cooled air comp.) I reaplaced the compressor only to find the same results. I love being the low guy on the totem pole, did not really get a chance to troubleshoot it just was told to do the grunt work. what should I check? as far as I know the other tech has flush the radiator and thats it.