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Check your coolant level. Most causes of no heat are low coolant levels or blocked heater cores. If it overheated and has no heat I'll beat its a low coolant level. Check for leaks. Just because the gauge didn't go all the way up doesn't mean much. Those cars trap air in the cooling systems when the level gets low. That will cause those problems. Check for leaks and if a repair is made I also recommend a termistat.
you may have to get this reset, alot of people dont know about this when the do the work them self. My oil light kept coming on until i read the book that after each oil change u have to reset it go figure .
It is located on the transmission side that faces the front of the car. It's just left and below the transmission spin on filter. It's the same sensor for the Engine Coolant Temp sensor and the Intake Air Temp sensor.
On the SL2 (DOHC), there are two coolant temperature sensors located on the left-hand side of the cylinder head, near the upper coolant hose. On the SL2, the upper sensor with ONE WIRE controls the temperature gauge in the dash. The lower sensor with TWO wires provides input to the computer. They are not interchangeable. Here is a tip you will need a 14mm deep socket or box wrench. The new sensor may require a 13mm socket or wrench, depending on the manufacturer. Good luck and hope this helps. Keep me posted.
the coolant temp sensor is located on the right side of the cyl head its small under by the upper rad hose 13mm socket removes it after u take the small connector of,make sure the car is cold coolant will come out when u remove it,,,,check the connector too for corrosion,by only saturn sensor the cheap autozone and aftermarket ones dont read right and give you the same problem as the old bad one
Try pulling the engine coolant temp sensor, They often crack not sure
why but the ceramic tip cracks makes the car hard to start, the car's
idle may race while shifting gears, and often smokes. The sensor is on
the right side of the engine when looking at it on the head. Easy to
change and get too
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