Ok so here is the latest problem with my 77 F-150. This truck is an automatic 4x4 351 modified.
I had noticed a while back that this thing was getting hot, so I replaced the radiator. I knew the radiator needed to be replaced anyways because it had the nasty green and every other color in the world coming out of. Hints probably about a million leaks. I replaced that with one of the best radiators I could get from Advance. I wanted to put in a good one since I plan to keep the truck.
I thought it seemed to be work ok but it would always be a little on the warm side, thinking this is just how this truck is. Well finally the thing had it one day and overheated big time, blew my radiator cap, and the radiator flooded over, and even blew the temp sensor. I replaced the temp sensor, radiator cap, and thermostat. This did not help it from overheating.
I then moved to the water pump thinking maybe there is something wrong with that even though it seemed to be fine. I replaced that one night and it still overheats.
Now frustrated with it I let it sit for two weeks before I take a hammer to it. I’m starting to think it is a headgasket. I say to myself let me try one more thing before I decide it is that. My last attempt was removing the thermostat so I can tell myself the thermostat is not stuck and I take the heater hose off and have it go back in the engine to see if the heater core may have something to do with it. Still the thing overheats.
Now when I replaced the radiator I flushed then engine so I know it has good clean stuff in there. I am now down to two thoughts… 1) The radiator that I put in is not good, or 2) I got a head gasket issue. I also did a headgasket test with the blue chemical stuff. When I did that it was suppose to change from blue to yellow. When I did it change from blue to a light blue/clear color. I would have to say more on the clear side of the two but not really white. While I was doing the test, it got so hot that the test tube I was using melted in the middle. Luckly I took it off before it was destroyed.
I have seen these things to put in the engine for a blown head gasket and they are guarenteed to work or your money back. So should I try that, or look more at possibly a bad radiator? One concern I have is, if it is not a head gasket issue, will I mess up my engine in any way by putting this stuff in? The antifree in the radiator looks normal, with nothing to think there is oil in it. The oil in the engine looks fine also, no reason to think there is antifreeze getting in the engine.
Thanks in advance for any ideas.