JFerg2000

My daughter has a 93 thunderbird with the V6 with 82,000 miles. Recently we are having cooling problems. The temp gauge will not move & it is rough on take offs then it will jump up to about mid way & just go back to cold then jump to hot & loose all heat. I replaced the thermostat & thought that fixed it. Drove for about an hour & things were great but when I shut it down & it cooled & drove it again the problem came back. I just replaced the radiator cap & lower hose & it seemed to do fine for about an hours driving until I shut it off & it cooled down & started same thing again after driving again. There is no steam cloud out the exhaust, the fluid is full & clean, no water in oil. I’m at a loss. Its like sometimes I can get in it & the circulation is great & then other times it goes nuts. Any help would be great. Thanks…

sickboyrossi

I have a 93 5.0 and it did the same thing. I changed EVERYTHING for the cooling system, it came to be a bad radiator. I heard they put in junk radiators that year. I went to a 24 fin per inch than th 12 and it runs good now!!

LunaticSVT

This could be anything. From Bad lines to bad radiator to bad temp thermostat.

S_Mazza

Or it could just be air in the cooling system. Try doing what it says here:

http://forums.tccoa.com/showthread.php?threadid=2721

It could, like the other folks said, be many things, even a headgasket going out, but since you don't see any obvious signs of that, trapped air may be the most likely.

How air got in there, I dunno. Do anything to your cooling system before this started?