[MR2] MK1 Coolant Problem
dkchal at datasync.com
Sun Sep 20 23:44:16 EDT 2009
The physics of the occurrence are fairly straight forward. The coolant in
the system heats up, expands, and an amount (usually equal or a little less
of the volume in the expansion tank between cool and hot) is forced past
the coolant fill (radiator) cap. When the engine is shut off, the coolant
in the inside undergoes a lessening of volume with the decrease in
temperature and a void in the coolant system is filled by the atmosphere
pushing the liquid in the expansion (overflow) tank back under the radiator
cap. If the cap is seated too tightly, the fluid will not go back. If the
hose and or lid to the expansion tank will allow air to leak out, then the
fluid will remain in the expansion tank, and the cooling system will have a
void which will have room for the expanding coolant the next time the engine
is heated. Was the replacement system working on the other vehicle? If
yes, did you use the radiator cap from that vehicle?
Although I'm pretty sure I have covered any problem with plastic cap on the
recovery bottle I can make certain this is not the problem. I can remove the
cap and use a simple hose from the coolant filler neck to the recovery tank.
That way there would only be the hose to consider. If that solves the
problem then that would be the answer. I have tried a replacement recovery
system but no change was noticed.
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