The Cadillac STS (Seville Touring Sedan), produced from 2005 to 2011, served as the brand's flagship rear-wheel-drive luxury sedan based on the Sigma platform. It offered multiple powertrain options, including a 3.6L V6 and a 4.6L Northstar V8
Debi, we could use more information about you Caddy. What year is it? Any submodel info we should know as well? What's going on with it that makes you think you need to replace whatever an auxiliary water pump circuit is?
When you state it like that, it would seem to imply that you want to replace some electronics or wiring rather than a pump; am I reading that correctly? Can you clarify what you mean?
@debisanders is it possible you received an error code like P2600,P2602 or P2603. Let us know why you think you have an issue with that circuit. What exact symptoms does your Cadillac have? IF it's just the relay I am certain you can do that by yourself.
"The auxiliary coolant pump system provides a measure of prevention against fuel vaporization due to excessive engine temperatures. The engine control module (ECM) commands the auxiliary or after boil coolant pump ON when the engine coolant temperature exceeds a calibrated value after engine shut down. The ECM applies ground to the coil side of the auxiliary pump relay. This energizes the coil and applies voltage directly to the pump motor through the switch side of the relay." The auxiliary water pump on a 2008-2011 Cadillac STS 3.6L is located near the back of the radiator fans
Hi @debisanders
What is the year and engine size of the vehicle?
by jayeff
Debi, we could use more information about you Caddy. What year is it? Any submodel info we should know as well? What's going on with it that makes you think you need to replace whatever an auxiliary water pump circuit is?
When you state it like that, it would seem to imply that you want to replace some electronics or wiring rather than a pump; am I reading that correctly? Can you clarify what you mean?
by Jerry Wheeler
@debisanders is it possible you received an error code like P2600,P2602 or P2603. Let us know why you think you have an issue with that circuit. What exact symptoms does your Cadillac have? IF it's just the relay I am certain you can do that by yourself.
"The auxiliary coolant pump system provides a measure of prevention against fuel vaporization due to excessive engine temperatures. The engine control module (ECM) commands the auxiliary or after boil coolant pump ON when the engine coolant temperature exceeds a calibrated value after engine shut down. The ECM applies ground to the coil side of the auxiliary pump relay. This energizes the coil and applies voltage directly to the pump motor through the switch side of the relay." The auxiliary water pump on a 2008-2011 Cadillac STS 3.6L is located near the back of the radiator fans
by oldturkey03