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Originally Posted by mbonly
I had cooling problems in my sd also but it wasn't as critical as in the 603 for just one overheating event and I'm out 2 grand, and will be looking for 2 #17 heads as opposed to one since my other 300d is down with a cracked head. I'm beginning to believe what others have voiced in this forum which is that our diesels were designed with picky and sensitive cooling systems or maybe we just get too confortable with the durability of our cars.
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I agree that these cooling systems are not of sufficient capacity to handle a heavy boost load from the 603 in high ambient conditions. Yesterday, mine was running to 100°C. on every uphill climb that lasted 15 seconds or more. In heavy stop and go traffic, same deal......right up to 100°C.
But, I'm quite convinced that there is nothing to be concerned about, provided it does not exceed 110°C. I've never seen it that high, but, I do believe that it will get there under more extreme conditions such as a 10 mile upgrade in 90°F. ambients. But, this is why you have a gauge. If it climbs that high, you can control the temperature, almost instantly, by lifting your right foot. Take the boost away and the temp will drop back to 90°C. within about 90 seconds, even with the a/c running.
Additionally, make sure that the auxiliary fan is working and that it will engage at the design temp. of 105°C. Of course, this is a difficult check to make. It's not easy to get the engine over 105°C. to confirm this. You might need to cover the radiator to do it.