Well, I took the 01 DHS with 89000 miles to the dealer today for a diagnosis.

They ran a pressure check and found that the head gasket was ok (big relief.)

They checked the cooling fans (ok) they checked that the lower hose was cooler than the upper hose (radiator doing its job.)

They drove it around town and recorded the temperature, which they said was around 220-225 in light traffic. Personally I think that's too high, but they seemed to disagree. Considering it wasn't extremely hot today and that the traffic count was light, I tend to think this is too high, but that's my opinion.

Ultimately, they diagnosed it saying it was ok, and they looked at me like I was crazy for saying the car was overheating. I even showed them when I arrived that the temperature needle was above the halfway mark. They seem to think the gauge is bad.

You have to understand how frustrating this is from my end. This took two hours and $65 to diagnose, and a part of me is thankful that I found a dealership honest enough to tell me there isn't a problem, but the other part of me is still convinced something is wrong. The needle climbs above the halfway mark while driving. Performance seems to suffer the longer I drive. Everything I've read here tells me that a temp of 225 on a not-so-hot day is too high. A few days ago it was over 100 here and during traffic I had a huge drop-off of power. Although no messages came up, I'm convinced I was running in protection mode, because it felt like the car was practically going to stall out, and I couldn't seem to get it above 50 MPH no matter how hard I pressed the pedal.

I just don't know what to do at this point. I've had two different mechanics tell me it's A-OK -- one of whom was a caddy dealer. At this point I think the only thing it COULD be is the impeller installed backwards or the thermostat installed backwards, but how the hell can I tell without having them rip the engine apart and charge me lots of money.

I'd like any advice on what to do from here. Also, I just had the top radiator hose replaced, so I assume that if the thermostat was installed backwards before they would have noted and installed it properly this time around.

I'm almost out of ideas here. I'd appreciate anything you guys can suggest.

Thanks,
Joe

 

can we just continue the same thread?
everytime you start a new thread we loose continuity of the problem.
i think this is the 3rd or 4th already ...

previous thread ...
https://www.cadillacforum.com/m_11253/tm.htm