On Fri, 2 Jun 2017 20:09:01 -0400, "Mr. Luddite"
wrote:

You sound right to me. That "air lock" thing is BS unless the plumbing
to the heater core is radically different than any car I have ever
seen.


We'll see. As I've mentioned in other posts the delay in fixing it is
because they have to get authorization from Nissan to do anything other
than what is in the standard, recommended repair instruction for a given
problem. The dealership won't be compensated for a warranty repair
otherwise.

After 15 days it will be subject to Massachusetts Lemon Law issues. I
don't expect that nor do I want it but it becomes an option at that
point. The other Lemon Law qualifier is an attempt to fix a problem 3
times on 3 different occasions.

Back in 1997 I bought a new Dodge Ram pickup from the same dealership.
I soon discovered that at exactly 42 mph it started to buck and hop as
if I was pulling a heavy trailer. I took it back and initially they did
the "cannot duplicate problem" response until I took the service manager
for a ride and demonstrated it. He agreed something was wrong and they
tore the engine apart looking for something in the troubleshooting
section of the Dodge service manual. Reassembled the engine and the
"hop" was still there. They finally contacted the regional Dodge rep
who came out and took a ride with me as I demonstrated the problem. He
acknowledged that there was definitely something wrong and said he'd
report back to Dodge about it. He said that in the meantime I could go
back to the dealer and pick out a new truck.

He then called me and asked if I'd be willing to allow them to try one
more thing. I said sure. They replaced the whole rear end of the
truck, complete with axle, differential, wheels, ... the whole thing.
Hop was now gone. A month later they sent me a letter. The original
rear end had been inspected by Dodge and the problem turned out to be a
faulty limited slip differential.

I had a similar issue with my jeep and it turned out to be a cracked
gear carrier in the rear axle. They can do strange stuff. I figured
mine out by removing the drive shaft to the rear and running it as a
FWD for a few days, no failure. Then I pulled the bucket from the rear
and saw the problem. Fortunately that was a pretty standard Borg
Warner part and I could get one locally. 2 or 3 times in and out to
get it shimmed right and I was good as new.