Losing coolant

[Pete Masterson]

Since I got my radiator re-cored (I won't count the coolant loss
before the radiator was working properly), I've had long periods
where the coolant seems to be in the glass each time I check -- and I
check each time I'm getting ready to leave a location. Other times,
I've found the coolant level below the glass -- and I've needed to
put in a few ounces to as much as a half-gallon.

I can't explain why theses periods of "usage" occur when compared to
times when the coolant level is stable.

My only suggestions: make sure the cap is on correctly. I find that
my coolant cap is difficult to turn to "the last click" and I may
have left it slightly loose. Also be sure that the cap is holding the
(rather low) pressure. Over time, the spring-valve in the cap can
weaken. If I recall correctly the cap is 7 psi rated -- so check to
see that you have the correct cap.

Beyond that, if there are no symptoms of leakage or other ways that
coolant is being lost, it may just be one of those mysteries ...

Pete Masterson
'95 Blue Bird Wanderlodge WBDA 42
aeonix1@...
On the road at Edinburg, VA



On Oct 23, 2008, at 11:26 AM, Don Bradner wrote:

> I've never had much coolant loss (except when dealing with
> replacing gate valves), so I tend to check rather sporadically. A
> couple of days ago I checked and it was not visible in the sight
> glass. Took roughly one gallon to bring it back to the top of the
> glass.
>
> This was approximately 480 miles since the last check (three
> separate runs with several days between each).
>
> I checked about 40 miles later (hot) and it was full. Checked it
> just now, cold, and it was not visible. Took a bit over a quart to
> bring it to the top. This was about 110 miles since the previous fill.
>
> My oil usage appears about normal, 5 quarts on this trip over 4300
> miles. I would expect less if it was going into the oil (unless it
> boils off??)
>
> I'm parked on clean concrete, and there are no signs of any fluids
> underneath (It's been cool enough that the air conditioner has not
> been used, so not even condensate).
>
> Any thoughts on what to look at/for?
>
> Don Bradner
> 90 PT40 "Blue Thunder"
> Posting today by satellite from Hilton Head, South Carolina
>