Ok, so I'll try to be as quick and accurate as possible on my issue. Bought my 03 cobra beginning of Oct. 2011 it had 106,000 miles, ran great for a few weeks, then overheated on the way down to get my cat back installed. Stopped the car when it got hot, luckily I was just pulling into the muffler shop. Let it cool for an hour or so then drove it home. Luckily my house wasn't far and the car didn't have time to overheat again as I drove it home. Thinking it was the thermostat I replaced it and filled the coolant back up. Drove it and got it up to norm operating temp. seemed to be fine. Parked the car, and came back out a few mins. later and theres a pool of coolant under my engine. Drove it down the street to the closest mechanic, the car just barely started to overheat as I arrived at the mechanic. So, the mechanic told me my water pump is shot and that I have a blown headgasket. He said he performed a block test to determine the blown gasket. He explained to me the process of the block test and even did another one while I stood there and watched; the fluid change colors. I told him to fix the water pump and ill just drive it home to park it while I get funds for new headgaskets. Here's the weird part. After the water pump was fixed I asked if the car was going to overheat, the shop said no it shouldn't overheat we drove it for awhile and it ran fine. The shop told me to come back in a week and have the block test again to see if the results were the same, free of charge. I ran my car that weekend and it seemed to run fine, got it up to norm operating temp and all seems well. Brought the car back to the shop a week later for the free block test (I didn't see the results this time). They said it took a bit longer to change color and the blown gasket doesnt seem as bad as when i first brought it in but they insisted that the gasket was still blown. Since Oct. I've drove my car normally and pretty hard at times and it doesnt overheat and doesnt show any signs of a blown headgasket. The only issue I have is that since they fixed the water pump in oct. I had to put a little coolant in the reservoir a week ago because it was a little low. I want to pulley my car soon, but afraid of a possible issue with the heads. A former mechanic at my work said that he at one time did a block test on a trans am and tested positive for a blown gasket but when he pulled the heads, the gaskets were fine and since then he doesnt trust the block test. Any insight, advice, or personal experiences would be greatly appreciated.
