RWD - Thermostat question: Is a clicking sound normal?
                    

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Thermostat question: Is a clicking sound normal? 700 1992

Cold engine, grab the upper hose, squeeze, hear a squish in the plastic reservor tank and a click in the thermostat housing. In a cold engine, shouldn't the thermostat be quiet?

I ask because of the jumpy thermostat gauge in the cluster and the possible bad thermostat issue.
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93' 240 Classic Wagon 220K & 92' 740 Wagon Regina/Rex 90K




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Thermostat question: Is a clicking sound normal? 700 1992

i thought the exact same thing, i went and changed it thinking 'something broken', but no theres a small relief hole with a loose metal stud in it...it means the thermostat never totally closes...Daryl




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Just in case I am replacing it tonight after work. 700 1992

I have a 16 year old daughter that is driving the car and I don't want to take any chances on overheating with such an inexpensive part.
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93' 240 Classic Wagon 220K & 92' 740 Wagon Regina/Rex 90K




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Just in case I am replacing it tonight after work. 700 1992

Make sure you place the vent hole "up" for burbing the system.
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Post Back. That's whats makes this forum work.




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Thanks, will do 700 1992

Hope this fixes the nervous needle.
--
93' 240 Classic Wagon 220K & 92' 740 Wagon Regina/Rex 90K




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Thermostat question: Is a clicking sound normal? 700 1992

Theres a "jiggle valve" in the thermostat which vents any trapped air; this is probably what you're hearing.




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Thermostat question: Is a clicking sound normal? 700 1992

Your thermostat is broken, probably. Very dangerous for your car if it sticks closed. Go ahead and replace it, it's a cheap part.

Ari




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Thermostat question: Is a clicking sound normal? 700 1992

The thermostats I see at the auto parts store for most cars also come in a fail-safe model for a little more money. The only way these can fail is by staying open, not closed. I see they're also available for Volvo.

http://tinyurl.com/lguyvb

Why would you get an OEM thermostat when you can get a fail-safe one and why wouldn't Volvo offer a fail-safe one?




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