Coolant leak

Dawrob

I don't know if you already had your Xterra leakage problem fixed. I have the same year and model Xterra but with about 57,000. On my Xterra there was some signs of anti-freeze around the neck of bypass hose connector to the manifold. The mechanic told me replacing the bypass hose will be $310 but he does not believe the leak is bad enough to do that. He said just to keep an eye on the anti-freeze level making sure it stays normal level. I believe your problem was similar but the pressure testing damaged your manifold gasket, thermostat housing gasket, thermostat, and bypass hose connection. If your engine needed a new knock sensor it should have registered as an engine error code when the SERVICE ENGINE SOON light came on.

I have a 2001 Nissan Xterra with aprox. 165,000 miles on it. A couple months ago I had some routine maintenance done (water pump, timing belt, etc). I was also told that my radiator was in very bad shape & needed to be replaced. Fine. A couple weeks after that my temp. Guage suddenly spiked so I took it back to my mechanic & he did a pressure test. No leak. He told me to leave it with him for the day & he called me later & said he had determined that I had a blown head gasket. So, he replaced both of those. Problem is, I'm still losing coolant. If I fill my reservoir tank to the max line, it's down to/below the min. Line in a couple days. I've taken it back to my mechanic & he's done another pressure test plus checked the oil for any trace of coolant. Both came up negative. The other strange thing that's going on is that my gas mileage has gotten horrible since all this started. I'm getting 30-40 miles less on a tank of gas than I usually do. Any ideas as to why I'm still losing coolant? Any help would be GREATLY appreciated.

Ballpark, how much should that repair cost (parts & labor)?

And. Would it be reasonable for me to expect the mechanic to not charge me for labor since it was missed the first time (when repairing the head gaskets), or is that just wishful thinking?