Slight Coolant Leak in Your CRD, Check this
I had a micro coolant leak that was driving me crazy, it was not the head gasket. I was not burning coolant, no coolant in the oil, no evidence under the oil filler cap, no hose leaks, etc. I was not losing much, maybe a cup every week, but the coolant level would drop, and only when driving.
Yesterday I found it. When changing the thermostat, I found that the bottom left side bolt was rusty and there was evidence of coolant leaking down onto the manifold. So it was due to a small gasket leak on the bottom of the thermostat, left side. All fixed now, new gasket went on with the new thermostat. Remember to torque the thermostat bolts to 27.5nm when installing new one.
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