Cadillac Repair Questions? Ask a Mechanic for Answers ASAP
Hello, my name is***** can help you on this.
Usually a whine in the transmission is the pump. The fluid will be thicker when cold. Verify fluid level in the transmission, if too high or low it will cause the pump to whine.
Make sure it's not a power steering pump, or alternator whine. If the power steering lines are leaking it could be, drawing air in causing a whine.
If the temp sensor was bad, it would set a code, not cause pump to whine. Double check fluid level, your vehicle does not have a dipstick so there is a procedure that needs to be followed. When trans fluid reaches operating temp it expands, causing level to rise. I would bet your trans fluid is low. Not saying your shop made a mistake, but things happen.
2003 Cadillac CTS V6-3.2L VIN N
AUTOMATIC TRANSMISSION FLUID LEVEL CHECKING PROCEDURE
Start the engine and allow the engine to idle until the transmission fluid normal operating temperature has been reached.Depress the brake pedal and move the shift lever through the gear ranges, pausing a few seconds in each range. Return the shift lever to the PARK range.Raise the vehicle on a hoist. The vehicle must be level, with the engine running and the shift lever in the PARK range.CAUTION: The engine must be running when the transmission fluid fill plug is removed, or excessive fluid loss will occur. Transmission fluid may be hot. Since the actual fluid level is unknown, stand clear when removing the fill plug. Have a container ready to capture any lost fluid. Do not turn the engine off with the fill plug removed, as you can be injured by hot transmission fluid being expelled out of the oil fill opening.
Yes, the level changes with heat expansion and contraction, if not properly filled, yes it could have air in the system cause the level to drop. If it is overfilled, it will turn the fluid foamy also could cause the pump to whine. Checking the fluid level is the easiest thing do, always start with the basics. Keep me posted on what you find. This is a sort of hard problem to diagnose over the computer, without me being able to drive the car, feel and listen.
I have been researching this problem and found a few TSB's related to whine noises.
When you bring it into the shop ask them to check for bulletins for this problem.
Yes keep me posted on what you find. Have a great weekend!
One was related to the rear end, the other I saw was related to the engine balancer pulley. There is another one for a bearing inside the transmission. I will get you the numbers and dates.
Do you have any updates on the car? Did you end up taking it in?