2000 Pathfinder Waterfalls?

coolant
pathfinder
gaskets

#1

I recently bought a clunker of a Nissan Pathfinder, 2000 model year with 150,000 miles. Needs a bit of work here and there, but a complete, running truck for $1500 was a good deal. But about the engine: apparently between 148k and 149k the head gasket blew due to low coolant, and was repaired. Now, I didn’t notice this on my first test drive, but I did a few days ago when I drove it and now own it: I gunned it hard to get into traffic and I heard a sudden whooshing sound, like water was rushing around in the engine or heater core. This is a bit of a surprise as there doesn’t seem to be a coolant leak, and the temperature gauge is at normal. Is it a concern?


#2

Yes, it’s a concern. It probably means there’s an air pocket in the cooling system. This air must be bled out of the system. There should be no air, only coolant.


#3

If indeed the problem is merely air in the cooling system, consider yourself fortunate. This a trivial problem, easily corrected. Good luck with your Nissan.


#4

So, a coolant flush, or ?? I have never heard of “bleeding” the air out of a coolant system, as would be done with hydraulic brake lines. I have been driving it the past few (summer) weeks with no indications of overheating, so maybe it is something that will go away on it’s own?


#5

If you have been using the AC it could just be a clogged evaporator drain,causing water to collect in the evaporator housing.