Re; 164Q overheating

[Alfisto@domain.elided]

My 94 LS is doing the same thing. I just got it back from the shop having a 
manifold replaced and found the overflow tank to be empty - even though I had 
not been on any big trip prior to that. Also no signs of leaks in driveway/on 
the motor, or in the motor oil etc. I filled it up and then did go on a 500 
mile trip including many miles stuck in stop-and-go- traffic and came back to 
find tank still full. As there was no reason to suspect the mechanic might 
have opened up a hose when replacing the exhaust manifold, it leads me to 
suspect a problem which I have experienced before - i.e whenever the engine 
overheats and the tank is filled to its upper level, a seam in the side of 
the radiator (which is plastic, by the way) opens up and coolant escapes. I 
did put in some stop-leak which cured it for a while, but it still does 
repeat itself occasionally. I did install one cure for the problem, that is, 
an on/off switch under my seat which goes to the fan relays. Whenever the 
needle creeps up to danger level ( esp. when air is on and in heavy traffic) 
I turn on the fan and leave it on for a while (although the fan does go on at 
its appropriate times). This keeps the motor adequately cool until I can turn 
the switch off again ( a must a.s.a.p. to prevent burnout). 
Graham

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