Is the heater core on the passanger or driverside in a 2003 cadillac cts

Question edited for clarity.
Question moved to model category.

It is a HUGE job, as the dash has to be removed.

https://www.google.com/search?q=2007+Cadillac+CTS.+How+to+remove+the+heater+core

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2003 Cadillac CTS V6-3.2L VIN N - Justanswer

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Apr 16, 2010 - Tighten the cylinder head bolts to 25 Nm (18 ft. Tighten the cylinder head bolts to 90 degrees using the J 36660-A. Tighten the cylinder head ...
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What Is the Torque for the Heads - 2CarPros

https://www.2carpros.com > ... > Cylinder Head > Torque
Jun 29, 2010 - MEMBER; 2003 CADILLAC CTS; 6 CYL; 2WD; AUTOMATIC; 100,000 MILES. I am repairing the heads of this car. whats the torque I need to apply?

Complete Torque Specs List ' Cadillac CTS-V Forum

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Jul 1, 2013 - Cylinder Head Core Hole Plug: 15 lb ft. Drive Belt Idler Pulley Bolt: 37 lb ft. Drive Belt Tensioner Bolts: 37 lb ft. Engine Block Coolant ...
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This is caused by a defective air temperature control blend door actuator motor or a jammed blend door or in most cases both..

Consider purchasing warranted rebuilt cylinder heads from "Cylinder Heads International" for $275.00 each with free return shipping of your cores. If you choose to do the work yourself get a library card which will allow you to free online access to Haynes or Chilton's repair manuals. Or for $27.00 get a one year subscription to "All Data" which has expanded information. Any of the above will have the timing spec's. Don't make the mistake I made trying to do it without borrowing or buying the tool for that purpose.

relays or fuses or motors can only be one of these

Have someone else do it ... seriously ... some you replace through the engine compartment some from under the dash. Not sure about a Cadillac. Do a Google search on "How to replace a 2005 Cadillac heater core".

heater core

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

thermostat, is check engine light on?

Get some flexible (not solid core) single core electrical cable of a slightly smaller diameter to the drain hole and ease it into the drain hole. Don't force it just gently ease it in. If that doesn't work you can sometimes use an airline to blow it out.