Could possibly be ! check the part numbers , should be stamped on the part somewhere . Do they both have electronic throttle control ?
SOURCE: Burning rubber smell inside car-2003 CTS Cadillac
Diagnosing this will be subject to a process of elimination. It could be the radio, blower motor or any other accessory particularly ones with moving parts; Try switching those off and try to note when this problem occurs and what is on/whatyou are doing. Something is getting hot causing the smell so it will be a situation where the accessory will have to run a while before doing it. It is a possibility that there is an electical curcuit overheating, but less likely. Lets rule out accessories first and give us an update. GL
SOURCE: CD Mechanical Error on 2003 Cadillac CTS
take the radio apart and take them out one by one, i just fixed my yesterday
SOURCE: The AM/FM radio in my 2003 cadillac CTS faded to only static
check antenna cable connections at radio & antenna.suspect power antenna if equipped.
SOURCE: Replace 2005 Cadillac CTS water pump
drain the coolant.remove belt by rotating belt tensioner cllockwise. water pump pulley will require a holding tool to keep it from turning while removing bolts. access to air ratchet can sometimes eliminate the need to hold but be careful cause thats a good way to skin some knuckles. also make installation more difficult to obtain proper torque. after pulley is off just a few water pupm mounting bolts remain. clean and dry gasket surface very well before reinstalling.
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SOURCE: 2003 cadillac cts v6 3.2 liter. white smoke
u have a leak in the heater core the oily smell and mist is anti freeze sounds like a small leak because usually u would have a wet floor if it was large -two choices check and repair as necessary the core or can use an additive with a stop leak they usually work well on small leaks
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