ok he told me he did a compression test and it was good, he said that my thermostat was a aftermarket one and was the wrong temp (i think he said it was a 170) he said i need the 190 OEM one and is in the prosess of changing it , I told him it would seem that the 170 should make run cooler but he said aftermarket ones are no good and may not open all the way.well see tommorrow

as far as the block tester is that like a compression test?