Question about 1995 Volvo 850
After 220,000 miles, my 850 overheated for the first time. I replaced the thermostat bu this didn't do the trick. ( I thought for sure it was the issue because I punged the old one in a bucket of boiling water and it didn't budge) I should aslo say that the hose form the resevoir to the thermostat housing blew a hole in it when it overheated. Where else should I look for a blockage that would cause that much pressure to build up so suddenly? Should my next move be to replace the radiator? I hate the thought of that much work.
Is there any oil in the water or mayonnaise under the oil filler cap? If so, I'm afraid you probably have a blown head gasket. The hole being blown in a hose is symptomatic of that I'm afraid. As I've posted elsewhere, if it's a T5 then it's much, much easier to get a secondhand engine & change it over rather than change the gasket (in any case, it can turn out to be a damaged head rather than/as well as the gasket).
If not then check the water pump itself.
To check the radiator, disconnect the top & bottom hoses; connect a garden hose to the bottom hose (gaffer tape is your friend :) and turn on the tap. Pretty obviously, if water doesn't gush from the top outlet, you have a blockage - try more water pressure (not a pressure washer!), you may clear it :)
Posted on Jul 20, 2008
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Posted on Jan 02, 2017
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