Quote:
Originally Posted by Christoph
Thanks for answer.
i guess i need a new radiator anyway.
Tried to clean mine as stated somwhere else by Tom Wesenberg.
Water is clean an not greasy anymore, but radiator seems to be barred somewhere.
difference between Top and Bottom of radiator is about 10 degrees
and it likes to go hot.
Will have to take it out to do this "4-second-drain-test"
Best regards Christoph
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Have you used a temperature gun to shoot several spots on the radiator to find cold spots? Spots with a lower temp than the tubes either side of it (but at the same height) would indicate blockage.
My radiator wasn't indicating blockage but it only showed about a 20 degree drop from the top tank to the bottom tank and the temp across the middle was about 10* lower than the top tank. Using a 160* thermostat, my top tank was running about 215* before cleaning the radiator. After the cleaning with heavy duty floor degreaser and then again using washing soda the operating temp of the engine has dropped by at least 20*. I will have to shoot the radiator again on a hot day to see what the temp drop is from the top tank to the bottom tank, but I seem to recall about 40* and I'm using a 160* thermostat.