I recently took the car to the dealership after it overheated on me and pushed coolant out of the overflow tank. Dealership used a block tester and diagnosed the car as having a blown head gasket. I had the car towed to a performance shop were a compression and leak down test were performed and found to be normal. The shop ended up finding that the plug for the cooling fans was melted. They ended up ordering a new plug and fans. The IC pump was also found to be intermittently working on inspection they found 1 of the wires was singed so it was replaced and the wiring was bypassed. These repairs fixed my overheating problem and the car is running good. After posting a negative review about my experience with dealership I was contacted by the Service manager who asked me to come in and allow another block test to be performed with me present, I agreed and the test was done this morning. The test fluid turned slightly green/dark green. I'm scheduled to put the car on the dyno again next week should I be concerned about the head gasket based on the findings of block test with no other symptoms?