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overheating 900 1994

posted by mrkd on Mon Aug 11 12:52 CST 2003
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my 94' 940 turbo begins to boil out of the cap vent after driving a few miles even though the temp gauge is at 12:00. I ran the engine at high idle with a thermometer in the expansion tank. the fan didn't come on until it reached 210 degrees, which at that point it started to steam and boil a little, but then quickly cooled down to about 190 within a minute. maybe a bad sensor? a volvo "expert" said it might be the radiator starting to clog slowing down flow. Car has 90,000 miles. also, where is the sensor located for the fan. I found two on the drivers side of the head. jumped the front one and that pinned the gauge, tried jumping the second one, but did not do anything. any thoughts would be helpful. thanks-keith

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overheating 900 1994

posted by rjk on Mon Aug 11 13:34 CST 2003
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last visit: Sat Dec 12 12:30 CST 2009

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Could be a headgasket leak/warped head. See the "overheating" threads posted by ChrisW in the past week. It may be worth your while to have a local shop test the coolant for combustion gases or at least the cooling system for leaks.

Although this is not a pretty picture, it is probably worth fixing depending on the overall condition of the car.

Let us know what you find out.
--
Bob Kraushaar '94 945T, '91 940T(back from retirement), '88 240, '84 242T, '94 F-150, '89 560 SL, '68 Shelby GT-500 KR

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overheating 900 1994

posted by Chris W on Tue Aug 12 01:46 CST 2003
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last visit: Sun Mar 20 10:15 CST 2011

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RJK offers good advice - yes. Print out all the threads from my posts over the past week... It may help you.

One thing you should consider doing - spend about $500 in preventative maintenance parts from fcpgroton - radiator, water pump, all cooling hoses, heater control valve, new radiator fill bottle and cap, etc... Basically refresh your cooling system.

But per your problem now, my car was definitely running hot like yours, yet the gauge was reading normal (12 o'clock) - but the tank was overflowing. Is there a lot of pressure in your cooling system? When the car is hot, can you grab the upper hose - and does it feel totally expanded? And is the coolant not so green anymore? If so, this can all be a sign of what I jsut went through - leaking head gasket. Definitely look at my posts below. And GOOD LUCK.

Get ready for the car to overheat on you - carry extra water for sure.

And replace your thermostat now with a good one - from volvo.

My shop charged my $75 to diagnose - totally worth it.

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