The ac in my cadillac deville only comes on when i increase the speed when i drive, so in other words, if i drive slow it wont come on and if i jus start the car and turn the air on; it wont come on t

I have seen this problem before and the cause could be TCC Staying in Lock-up or an Electrical Issue within the Engine itself or a Fuel Delivery Issue.

If the Transmission TCC is the issue, try driving at slower speeds (below 30 and come to a stop, does it Shut off then? Increase Speed by 10 and try again. Does it react differently once you go above 42-45 MPH?

It sounds like the transmission oil could be low as it doesn’t have to be down much for your type of problem to occur.
To check, the oil should be warm with the engine running and the transmission in Neutral. The level on the dipstick should be between the Low and Full Marks. There is about 1 Pint difference between the marks.

Either of the two reasons. 1. The slow running is slower than required. In other words, the idling speed is slow. Just increase it a little. Or 2. The fuel line is clogged/blocked. Clean it

Are you sure it is the engine. Try putting in neutral as you are slowing down. If the noise is still there then it sounds like a wheel bearing failing

97 cadillac deville digitil dash shut off????????cheched fuses?

was there water in the gas?

I HAVE A 1998 CADILLAC DEVILLE,THE AC BLOWER MOTOR GETS HOT AND TURN OFF AND WONT TURN BACK ON UNTIL IT COOL OFF, WHAT IS THIS PROBLEM?

The cooling fans will not come on until 225 degrees. Normal temp is around 199-215. Sitting still in traffic most will inch up around 220 or so. When you turn ac on it turns the fans on and may cool down engine, Check fan operation.

might be clogged catalytic converter it can cause loss of power due to carbon built up that's why it seems like it takes a bit to pick up speed

have throttle position switch checked and idle control valve checked.