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i need to replace mine also and is it located at top of upper hose to the right..under...near housing..looks like a real pain in the but..thermostat cost 7 dollars at any NAPA..but labor would prob be about an hr if you took it in...if you can find it..(it faces downward)..and remember what you took off..you can prob put it back together..good luck Very easy repair actually. Make sure that you replace the gasket at the same time. You may have to disconnect some wires if they black access to the thermostat cover.

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Q: How do you replace thermostat in 1990 Oldsmobile cutlass cierra?
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