QuestionI've had my car in and out of the shop 3 times over this problem, and nobody seems to be able to tell me what's going on. I've gone to 3 different places, and everything's the same...nobody knows anything. Please help!!!
My car WAS leaking coolant and we never could find the source. I had dye run through, had the cooling system pressure tested, and everything came back nil. Finally found what I thought was THE leak coming from the radiator, and I replaced it with an aftermarket model. Things were going great for a few days, but now I notice everytime I get on the expressway and take her above 60 (32v Northstar 4.6L should have no probs with that, right?) she starts to run hot. Well, that's not entirely correct. I've noticed everytime I take her above 2000 RPM she starts running hot, which is around 60-70 mph. When I decrease my speed and lower my RPM to below 2000, she levels out again at around the half-mark on the engine temp gauge. I'm not losing coolant, and the thermostat was replaced just before the radiator.
Any thoughts as to why my car keeps doing this? Any answer will be greatly appreciated for I'm racking my brain and draining my wallet putting her in the shop all the while the mechanics tell me nothing "appears" to be wrong. Please help!!!
Thank you.
AnswerAre you leaking fluid on the ground ?.
Are you having to ADD coolant to the radiator at all ?.
This engine is FAMOUS for having loose head bolts due to the steel head bolts stretching the head bolt threads in the aluminum engine block and causing combustion chamber pressure to seep into the coolant system thus restricting the coolant flow.
Repair will consist of drilling out all the engine head bolts and installing steel heli-coils into the engine block and replacing the head gaskets and all the head bolts.
There are numerous manufacturers service bulletins pertaining to this well known problem.
