Cadillac CTS First Generation Forum - 2003 - 2007 Discussion, 2003 CTS thermostat in Cadillac CTS Coupe, Sport Sedan and Sport Wagon Forums; thermostat is out in our 2003 CTS....my mechanic says it will cost $455 to replace it. Does that sound reasonable?...
By the way, this question is a good example why a shop manual is helpful for many owners. Even if you are not a mechanic, you can look many items up in the shop manual to see how involved most repairs are. Over the life of the car, I believe the shop manual would pay for itself--just by identifying when someone is or is not trying to rip you off.
The CTS set also weighs about 15 lbs or so. 3 manuals that are 8.5 X 11. Also about 2.5 inches thick. They are very useful when substituted for phone books--if you are talking about the utility of such an item. (substitute for high chairs, paper weights, weights on top of car cover, etc.)
Is it more likely that the thermostat electrical sensor is broken instead of the mechanical thermostat? (the auto parts store said there are 2 pieces to do this job: a sensor and a thermostat) The local cad dealer quoted $400 to do a thermostat replacement (another non-dealer quoted $600 do to the man-hours quoted for the procedure in their book) If it is an easy fix, I was hoping to do it in my home garage. I got a few pictures (pdf file) from this board over a month or so ago for this thermostat replacement procedure but the pics were fuzzy and not as detailed as I hoped. I removed an intake on a 1998 ford taurus 6 cyl to do a sparkplug replacement and that was easy but under my '03 CTS hood, it looks like a rats nest of wires and harnesses; I'm not looking forward to doing this job. Any comments on the question above in the first sentence?
My son and I replaced the thermostat in his 03 CTS TODAY.
My wife also has an 03 CTS so I was very interested.
It took us 5 hours to get it done with the GM Service Information (online) avaiable in the our shop. The SI says to remove the plenum and intake manifold but not the lower manifold on the 3.2L engine (different for the 2.8l amd the 3.6l). The lower manifold must be removed to remove the manifold on both of our 03 CTS's. With that knowledge. it is a 2.5 to 3.0 hour task. We played with the clearances between the head the rear of the timing cover and the lower manifold. After we ate lunch we removed the lower manifold and from there it was a matter of bolts.
Our wasted time came from two sourdes: 1) the lower mainfold needs to be removed; 2) it is easy to remove the lower manifold if you remove the fuel rail and injectors so that the "manifold" comes out of the "V" in the center of the engine.
Hope this helps from someone who has just done it!
I just had mine done under a really short warranty I got when I bought my 03. Fortunately, I got the warranty because it was a long job. I'm sure it took them more than 3 hours. Plus my thermostat housing was cracked (?) and had to be replaced.
At least I got it fixed-- it sounds like almost everybody with an 03 has thermostat problems right now.
got the same problem right now, intermittently throwing the P0128 low coolant temp code, dealer told me the tstat needs to be replaced, quoted me $500. i'm a diy'er, but not a hardcore mech, so the idea of pulling the intake manifold kind of scares me, probably just take it in the arss and have them do it.