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Unread 07-27-2018, 02:19 PM   #1
Rich Z
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Join Date: Mar 2006
Location: Crawfordville, FL
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Name : Rich Zuchowski
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Default Exhaust heat melted my extractor tubes :(

The other day I was checking out the AC compressor coolant pressures on the C5Z, and had the car running for quite a while. To keep the exhaust fumes out of the garage, I put the contraption I made up out of plastic drain pipe onto the exhaust tips on the car. This helps not only with extracting the exhaust fumes, but it greatly reduces the noise level too, which is nice when trying to listen for any unusual noises from the engine compartment.

Anyway, I knew the exhaust gases were pretty hot, as shown when I used my FLIR thermal imaging scope.



But I guess I just didn't think about it and that the length of time I was running the engine might have an impact on those plastic tubing pipes I was using.







Didn't melt them to the point where they opened up, so they are still usable. But certainly something I need to keep in mind in the future. Maybe if it weren't so blasted hot in the garage I could have run the engine longer without them heating up quite so fast.

Interesting how only two of the four pipes melted like they did.

In any event, the AC coolant pressures looked OK to me. Maybe a little high on the low pressure side, but nothing bad enough to do anything about. I guess the AC compressor clutch clicking on and off during idle while the engine is cold is nothing to worry about. Certainly the AC is pumping out pretty cold air in the passenger compartment.
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