My automatic transmission shifts first and second gear properly, but the third gear which is supposed to shift at thirty mph with lower rpm. It does not shift until it reaches over forty mph and the fourth gear only shifts when it reaches over fifty eight mph in cold weather which is usually shifted at forty five mph. These shifting only happens when the temperature outside (weather) is higher, usually when it is over eighty degrees Fahrenheit. This problem only happens in summer or in hot weather. I deliver pizza on this car so I drive it all day and the problem never happens in winter. The engine coolant is always at operating temperature and it has never been overheated. When I spray a lot of water on the radiator and transmission cooler in the hot weather then It starts shifting regularly but it only lasts for about thirty minutes, then again it goes back to irregular shifting. If I Spray water again It would shift normally. To diagnose this problem I flushed my radiator properly and added a brand new coolant. The transmission fluid is in good condition. It does not smell burned and it is at the proper level. I recently brought an external transmission oil cooler which you can see in the photo below. I installed this oil cooler but the problem still continues.
I believe the cooler I Installed might be too small and it is very cheap and it is not cooling the fluid enough. It only cost me about $40.00. Should I Install a better cooler or do you have any other suggestions?
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Tuesday, July 24th, 2018 AT 5:31 PM
