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Posted on Jan 02, 2017
The only fluid expansion tank I know of is for the cooling system,and if that is the case you my have a leak in the transmission cooler that is built into the radiator.
Posted on Jan 03, 2009
John, this sounds like a valve hanging up in the valve body. The car shifts when the govenor pressure overcomes throttle valve pressure in this valve body.
What is the condition of the fluid? Is it at all dark or grey, does it smell burnt? It should be a nice light pink. If not, have the fluild and filter for the trans changed. This may take care of the problem.
If the oil is really burnt, you are at the end of the life of the clutches and you are looking at a complete trans rebuild. If the oil is ok, a trans shop should be able to take just the valve body down, clean it and eliminate the problem without overhauling the entire transmission
Posted on Feb 09, 2009
I also have a 1999 sl2 saturn . I was having about the same problem but mine also did not want to go into reverse somtimes as well . Ichanged my fluid and filter and put in a good trans conditioner and just about all my trouble went away. The trans filter is just like a oil filter it just screws on the outside of the transmission . It is located down under the air filter housing, and the fluid plug is right on the bottom of the trans.
Posted on Mar 29, 2009
Your going to have to get the car scanned for the DTC code. The Check engine light indicates that the ECM has detected an issue with the cars engine or transmission performance. Your hard shifting could be the failure to the Pressure control solenoid (PCS), that would be a DTC code P1811. The PCS is located under the trans axle side cover assembly. IF you go to Auto Zone, they can scan your car free of charge and can give you the step by step instruction to replacing the part that may have failed. Good luck and keep me posted, be glad to help.
Posted on Jun 12, 2009
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