Replacing a thermostat on a 1999 Oldsmobile Cutlass is very easy to do. First you will find the thermostat by following the upper radiator hose. It is under the exhaust crossover. The thermostat has two 13 mm bolts holding it in place. Take the bolts off to remove the thermostat and replace with a new one.
The thermostat is located where the hose leaves the engine to go to the top of the radiator. You unscrew the bolts holding the hose mounting to the engine. There you find the thermostat.
The oxygen sensor on the 1999 Oldsmobile Cutlass Sierra is located on the lower exhaust. If you need to replace it, they are available for about $20 online.
Follow the top radiator hose down to the water outlet on the engine; the stat is in there.
take the complete headlight assembly loose or out to get to the bulb.
? Thermostat ?, do you have good heat, may make the computer ( ecm ) assume your on cold start up.
DEX-COOL
how do you replace head lights on my 1999 oldsmobile alero?
replace a fuel filter on a 1999 Oldsmobile Silhouette
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Remove the wiper arm from your 1999 Oldsmobile Cutlass wiper motor. Remove the wiper motor wiring harness. Remove the wiper motor retaining bolts. Reverse the process to install the new wiper motor.
I'd call a locksmith. They will be able to tell you the exact problem and how to fix it.
The 1999 Oldsmobile Cutlass OBD 2 port is under driver side dash left of steering column