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945T Coolant Brown, Black Sludge Under Coolant Reservoir Cap. Thoughts? Flushing Advice? 900 1993

uid 46171's pic
posted by  kittysgreyvolvo on  Tue Jul 11 00:29 CST 2017
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last visit: Sat Oct 18 15:23 CST 2014
[RELATED]

How do the upper radiator brackets recently fail? And you did nothing to remediate the issue soonest?

So, the radiator is at essence, flapping in the breeze? A coolant radiator, well, even an engine oil cooler, is a frail thing. They operate fine when properly supported and move very little, yet much slow torsional distress will cause these to quickly fail and lose seal internally or lose the fluid circulating inside them externally.



I'll guess your 1993 Volvo 940 Turbo Wagon also uses the factory stock combo radiator for both engine coolant and transmission fluid cooling.



The image of coolant in the bucket show a mix of engine coolant and transmission fluid at prima fascia (first glance).

Loosing engine coolant for awhile? I'll guess no engine coolant is lost exterior to the coolant system including the engine. That would be a fail cylinder head gasket seal to the engine block. The coolant loss can occur in myriad ways, until the cylinder head gasket seal is lost.



The coolant expansion tank reservoir cap underside image show a coating of engine cylinder combustion product coating it. More than likely the cylinder head gasket has lost seal (as you note coolant loss for awhile) and combustion is blowing into the coolant system.

If this coolant mix has been going on for some time, and the fluid in your transmission appears about the same, your transmission may be toast, also.

The engine oil is jet black? When was the last time you changed it? 15,000 miles ago? A RWD Turbo Volvo automobile does not suffer neglect and abuse well. Durable they may be, yet without care and with abuse or hard driving and hung up wet, well, what you're encountering here.

Sorry for your problems. Hope the fix is not too bothersome. Be careful working with the turbo / exhaust hardware. Kroil is maybe the best penatrant, yet knock rust off the exposed studs before removal. Acetylene to heat stuck exhaust nuts may also help. New Volvo OEM exhaust studs, unless these are also now made in China.
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