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changing the thermostat in a 1991 geo metro 1.3 liter
Check the coolant sensor on the throttle body.
The 1991 Geo Metro EGR valve can be located on the air cleaner housing. The valve will be on the back of the housing.
under he motor mount
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If its from 85 then its NOT a geo metro engine. It is probably a Chevrolet Sprint engine because they only started making Geos in 88. If you need an engine for your 95 Geo then you could use one of the following: 1991 - 1995 Geo Metro engine. 1991 - 1995 Suzuki Swift Engine, and 1991 - 1995 Pontiac FireFly engine. Hope this helps :)
They are blue, black and white. They can be found extending from the catalytic converter (the upstream O2 sensor) and possibly from a second source (the downstream sensor).
in the exhaust pipe right under the manifold it is easy to get to right in front under the hood
4
That depends on what it is doing or not doing.
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You replace it you do not fix it.