Thermostat Change 2003 CTS

[wbowditch]

Hello Caddy folks, Im new to the site. I have a 2003 CTS with high miles and now have an engine light on. Dealer didnt exactly tell me what the code was. They told me I MIGHT need a new thermostat. Them darn fools want $816 for a thermostat and coolant flush. WOW! They must be outside their minds.

I do have a couple of questions for anyone that can help me out.

Is there a way I can see what code the caddy is throwing without going back to the dealer?

Does anyone have know of a schematic that I can use to change this thermostat?

Thanks to everyone that can help me out. Love the site.

[Bruce Nunnally]

With the ignition in the on position, but the engine off, press and hold the F1 and F6 buttons on the stereo. After a few seconds all the lights should flash on the dash, then the DIC should show DTCs and etc. Post any codes you find here.

I don't recommend coolant flushes. Ask them to drain and refill, not flush.

The thermostat replacement on the 03 CTS is fairly involved, as y ou have to remove the intake manifold:

1. Remove the thermostat housing. Refer to Thermostat Housing Replacement .

1. Remove the coolant outlet pipe. Refer to Coolant Pipe Replacement - Outlet .

2. Remove the intake manifold. Refer to Intake Manifold Replacement in Engine Mechanical-2.6L and 3.2L.

3. Remove the thermostat housing bolts (1).

4. Remove the thermostat housing (2) with thermostat, from the engine.

5. Remove and discard the seal ring.

6. Remove the thermostat from the thermostat housing. Refer to Thermostat Replacement .

2. Complete the following in order to remove the thermostat from the thermostat housing:

1. Depress the ears on both sides of the thermostat.

2. Rotate the thermostat until it clears the retaining feature of the housing.

3. Release the pressure from the thermostat.

4. Pull the thermostat from the thermostat housing.

[wbowditch]

Thanks for the quick response. Here is what my screen read. There is alot of material here. I will sum it up and give more #s if I need to.

ARS B1327H / U1016H

DDM B1327H / U1714H / B3832H

DDS B1327H

DIM B1327H

EBC U1016H

LRD B1327H

MSM B1327H / B2375H / B2376H

ONS B2470c

PDM B1327H / B3832H

RIM B1327H

RRD B1327H

SDM B0058H

ECM P0128H

Could anyone tell me what these codes mean? Thanks all.

[Bruce Nunnally]

Check the DTC list for a 2003 CTS here: http://www.caddyinfo.com/dtc_2003cts.htm

The last letter H=history C=current. History means it has happened recently but is not happening at the moment; current means it is happening right now.