Both. Forgot to mention it could be the sensor but no real evidence of that

On Thursday, December 10, 2015, Jim Felder <jim.felder@gmail.com
<javascript:_e(%7B%7D,'cvml','jim.felder@gmail.com');>> wrote:

> Drove five minutes pulled over again as temps rise past 3/4
>
> On Dec 10, 2015, at 12:29 PM, Edward Maglott <emaglott3@gmail.com> wrote:
>
> odd symptoms.  when you went 200 miles yesterday with no problems, did you
> stop?  do symptoms correlate with stopping for some period of time during a
> drive, such as when you go to a store or on an errand?
> Edward
>
> On Thu, Dec 10, 2015 at 1:22 PM, Jim Felder <jim.felder@gmail.com> wrote:
>
>> Two weeks ago I completed the conversion of my diesel Vanagon Westy turbo
>> diesel over to the new style tank with new engine hoses. As I write this I
>> am sitting in a Hardee's parking lot waiting for about the 15th time in the
>> last two weeks for my engine temps to go down to the point I can drive the
>> car. Before I left home for the short drive, I bled the cooling system
>> according to the Bentley for the eighth or 10th time since making the
>> conversion. I have only managed to have heat from the heater once or twice
>> in the last two weeks. I am on my second blue coolant In that time. When I
>> wake up in the morning I check it first thing. Always there is considerable
>> pressure left in the system from the night before. I installed a new
>> thermostat. I tested the old thermostat and the new thermostat on the
>> stove, and they both operated exactly the same. I put the new one in
>> anyway. Usually I can drive somewhere as to a store maybe 4 miles away.
>> Going to a store or on an errand it's likely to run just fine with the
>> needle steady in the center all the way there. Then on the way back I
>> typically have to pull over just like I have done now. I can let it cool
>> down maybe leasing the L some air out, and then be on my way with a
>> slightly hi or sometimes normal temp gauge. I never know what to expect.
>> But no longer can listen to audio because I have to keep my attention
>> riveted on the temp gauge. It's not leaking. I'm not losing coolant. I just
>> can't get rid of this air bubble. I don't think I have a leaking head
>> gasket because yesterday I drove to a town 100 miles away and back without
>> really having any problems. There are some steep hills along the way. The
>> temperature stayed normal. I don't find any soot in the coolant or water in
>> the oil.
>>
>> Any ideas? The temps were perfect before my "upgrade."
>>
>> Jim
>
>
>