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Leaking Thermostat 900 1994

posted by  chrisjul on  Sun Dec 30 07:19 CST 2001
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last visit: Sun Jan 22 20:46 CST 2012
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I have a leak from the thermostat housing on my 94 940. Tbe coolant seeps from the housing (the aluminium part that you remove to replace the thermostat. It leaks faster as the engine accelerates. I have replaced the thermostat and the seal twice. Any ideas? Should I try some type of "Form-A-Gasket" or sealer? Thanks in advance. Chris








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Leaking Thermostat 900 1994

posted by  david hunter on  Sun Dec 30 10:55 CST 2001
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last visit: Mon Jun 30 22:10 CST 2014
[RELATED]

Did you replace the gasket? There is a seal which as I remember encircles the thermostat and there is a gasket which seals the two flat metal surfaces between the thermostat housing and the head. I always install new gasket along with gasket goo such as permatex.








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Leaking Thermostat 900 1994

posted by  pablos on  Sun Dec 30 08:20 CST 2001
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last visit: Tue May 22 00:43 CST 2001
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This is a tad odd. Never had one leak. Is the surface flat and free from pitting? If so yes give some good RTV a try. Is the seal from Volvo?








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Leaking Thermostat 900 1994

uid 27's pic
posted by  Art Benstein on  Sun Dec 30 09:58 CST 2001
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last visit: Fri Oct 17 20:10 CST 2014
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I'll admit to having had one leak. That is how I discovered the groove in the cross section of the Volvo seal. Yes, and after several examinations for pitting and corrosion...puzzling over the placement of the seal...being tempted to add a dollup of RTV! Confession is good for the soul.







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