Depends on the engine - location is usually inside the housing where the upper rad hose attaches to the engine.
SOURCE: thermostat on a 2002 chevy malibu
Which engine>? There are a few different engines available.
SOURCE: dtc code p0121 and p2135 2007 chevy malibu
both codes refer to the throttle position sensor, the sensor is at the throttle plate, on the side of the throttle body. to test remove the connector to sensor, use a ohms meter to test. put 1 lead to top connection and the other to the bottom one. move throttle and the needles on the ohms meter should move very even, move throttle slow to get a good reading, needle should move without no hesitation, if the test is bad replace tps sensor. if the sensor gets to bad, it can have an effect on transmission shifting. after fixing sensor have the light turned of with an obd2 scanner.
SOURCE: why is coolant spitting out of reservor of 1999 chevy malibu
Probably a blown head gasket. Not an easy fix and not for the faint of heart.
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