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You can tell the oil cooler is bad in a Cadillac CTS 2003 when oil is in the coolant and the water turns into a white muddy substance
Oil cooler is bad.
Bad seal? Leaking cooler line?
Most likely a bad thermostat or refrigerant leak.
A bad radio speaker
bad plugs or wires, bad coil pack, fuel injector not spraying. bad gas
A bad head gasket can do that or an engine oil cooler gone bad in the radiator. The year, make and model info would help.
The sensors go bad and are $188.00 a piece @ the dealer.
Bad spark plug or wireBad valve (do a compression test)Bad piston "
the blower fan resistor has gone bad.
Usual cause is a bad radiator, the coolant and trans fluid mixes in a failed cooler.
sounds like bad head or gasket do compression test on cylinders