You can see the image below a series of flushes, the first being on the left. Air conditioners work much like a refrigerator, transferring heat from the interior of your home to the outside. In warm climates with low humidity, evaporative coolers can be a cost-effective cooling strategy. I do strongly suspect though, due to the condition of the hoses and old thermostat, that the last owner ran the system with normal water and let it sit for a while.Ĭould this be oil in the cooling system? Or is it just really old and rusty? A whole-house fan, in combination with other cooling systems, can meet all or most of your home cooling needs year round. The car appears to run fine in all other respects - no issue starting, no smoke from exhaust. I also had the rocker cover off recently and didn't notice anything unusual there, either. I checked the dipstick, too, and the oil there seems normal. It doesn't feel thick or greasy and it doesn't smell - it feels like normal water, only brown. Furthermore, the drained water doesn't seem to separate like oil and water probably should (even after leaving a bottle sitting for a few days). The substance left on my catch-tray after draining seems kind of pasty and dries almost powdery. In fact, after 3 drains it appeared to get a little darker.Īt this point I'm worried if it's oil intruding into the cooling system, but it doesn't appear "creamy" or thick like oil in coolant photos I've seen before. I flushed the system again with just demineralised water about 5 more times (filling the radiator up, bleeding the air, running with heater on until hot, draining), but keep getting the same colour coming out - not appearing to get any cleaner. I did a flush of the system with a cleaning product combined with demineralised water and again drained the system. I looked at the radiator hoses (which, incidentally, are in very poor condition) and noticed about a 1mm of brown, rust-coloured sludge on the bottom of the hoses. The coolant that came out was a brown, rusty colour. There was a problem with the cooling system - air pockets and bad water pump bearing - so I replaced the pump and drained the coolant. ![]() I am working on a 1988 Accord (CA) that has been sitting for some time.
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