coolant sensor

[poolredalligator]

My coolant sensor may be acting up as the DDEC is returning a code of
low coolant. However, when I check the coolant level it is okay. The
only sensor I find is the one on the coolant reservoir. Is there
another one on the radiator in a PT40, 475 HP?? If so, where is it and
how do I get to it??

Gene Marshall, Dickinson, Texas 1988 PT40 WB

[ronmarabito2002]

Gene:

Are you sure that is the only code you are receiving? I had that
problem last year. Nothing wrong with the coolant, but I had a leak
right above my oil pressure sending unit that had a hole in the
plastic cap from a loose compressor belt rubbing on it. I couldn't
see that code, but when we hooked up the code reader, there it was.
Take it by a dealer and check with the reader.

R.E. (Ron) Marabito, Dallas, TX 92WB40


\--- In WanderlodgeForum@yahoogroups.com, "poolredalligator"
wrote:
> My coolant sensor may be acting up as the DDEC is returning a code
of
> low coolant. However, when I check the coolant level it is okay. The
> only sensor I find is the one on the coolant reservoir. Is there
> another one on the radiator in a PT40, 475 HP?? If so, where is it
and
> how do I get to it??
>
> Gene Marshall, Dickinson, Texas 1988 PT40 WB

[vmarshall@...]

Ron, I am not receiving any other codes-always the 1-3 that reads lo-coolant
sensor. I
note that when I overfill the coolant reservoir the engine light does not come
on as often
but because the reservoir is so full, I lose the coolant and have to overfill it
again if I
want the keep the engine light from coming on so often. The oil pressure sending
unit
was replaced on June 7, 2004 so I don't think that it is the problem as
everything looks
fine there. Any other ideas you might have is certainly welcomed. Missed you at
the
Kerrville Rally.

Gene Marshall, Dickinson, Texas 1988 PT40 WB

[ronmarabito2002]

Gene: No other ideas other than take it to a shop that has a reader
and have it checked. Simply clearing all the codes past and present
might just solve your problem.

R.E. (Ron) Marabito, dallas, TX 92WB40


--- In WanderlodgeForum@yahoogroups.com, vmarshall@h... wrote:
> Ron, I am not receiving any other codes-always the 1-3 that reads lo-
coolant sensor. I
> note that when I overfill the coolant reservoir the engine light
does not come on as often
> but because the reservoir is so full, I lose the coolant and have to
overfill it again if I
> want the keep the engine light from coming on so often. The oil
pressure sending unit
> was replaced on June 7, 2004 so I don't think that it is the problem
as everything looks
> fine there. Any other ideas you might have is certainly welcomed.
Missed you at the
> Kerrville Rally.
>
> Gene Marshall, Dickinson, Texas 1988 PT40 WB

[vmarshall@...]

Ron , is there a way to clear the codes myself. Stewart & Stevenson is the
only place I know of that has the means to read the original DDEC and they
charge
an arm and a leg here in Houston. Thanks,

Gene Marshall, 1988 PT40 WB

[Tom Warner]

Gene I dont know much about the Detroit Diesels except I like them. Maybe
this will help you.
http://tinyurl.com/blgyv

http://tinyurl.com/9nlp2

Tom
1982 FC35
Vernon Center,NY
In the beautiful Mohawk Valley



t 02:12 PM 5/2/2005 -0500, you wrote:
>X-Virus-Scanned: by amavisd-new at ispc.xtelegent.net
>
>Ron , is there a way to clear the codes myself. Stewart & Stevenson is the
>only place I know of that has the means to read the original DDEC and they
>charge
>an arm and a leg here in Houston. Thanks,
>
>Gene Marshall, 1988 PT40 WB
>
>
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[Bob & Carol Howald`]

Gene: I had about the same problem a few years back on my 93pt. I
would get the low coolant flash code and also about the same time I
would get the check transmission light flashing when I would go from
bright to dim on the head lights. I bought tuner spray cleaner and
took
the cannon plugs lose and cleaned them well. I then went completely
over every ground strap on the coach. also added a extra one next to
the one on top of the transmission. After doing all that I have not
had
one problem with false code's or lights. It also corrected my
speedometer from running about 15mph standing still. Bob 93pt40
500hp
DDII..Illinois

[awojteczko]

Hi Gene,

I am having the same problem with the low coolant code as yourself. I
have to overfill the tank to stop it from happening. I usually get the
check engine light flash when going up a long slope. I have not been
able to put my finger on the problem as of yet. If I find the cause I
will let you know. I do not think that clearing the code will solve
your problem. I have already tried that.

Andy
88 WB40

[vmarshall@...]

Great information. I had the DDEC Codes but not the other documentation.
Thanks!!!!

Gene Marshall, Dickinson, Texas 1988 PT40 WB

[vmarshall@...]

Andy, thanks for the reply. I forgot to mention in my post that my engine light
also comes on more often when I am climbing a long hill. Must be something
that is common with the 88 PT 40's. Hopefully between the two of us we can find
a solution to this problem and will not have to keep over filling the coolant
reservoir.

Gene Marshall, Dickinson, Texas 1988 PT40 WB