May not be anything ... but as a Ford owner, I've had numerous temp
problems. Stayed cooler than normal at idle. At speed normal temps. At,
for example, stopping at a red light, the temp would automagically drop
well below normal. At take-off. back top normal. Never over-heated though.
Local Ford Dealer said the problem was impeller on w/pump and it's
disintegrated. Replaced w/pump ($700.00 ). Still had problems.
Turns out the water jackets in cast iron block would "flake rust" into
the heater core. Back flushed heater core and that solved the problem.
Heater core back flush in now an annual ritual. No more temp problems.
Chap
*****
On 7/11/2011 11:55 AM, John Jenkins wrote:
> Do a pressure test. Be sure to watch for fluctuations(surges) in pressure.
> Surges mean head gasket. Loss of pressure should make leak easier to find. Cap
> could be bad. Do pressure test on cap.
> Green spitfidget and others
>
> Sent from my iPad
>
> On Jul 11, 2011, at 12:57 AM, Lester <oldsaabguy at comcast.net> wrote:
>
>> hmm.. air pocket or worn impeller ?
>>
>> Lester
>>
>>
>> On Jul 10, 2011, at 11:09 PM, Leo wrote:
>>
>>> In between dr visits and stuff I am trying to fix a problem on a 1998 F700
>>> Box truck with a 7.0 (429) MFI engine. The truch as set for 6 months
>> before
>>> I got it and had to do a major tune up, new in tank fuel pump and I
>> nstalled
>>> new thermostats (has two, 165 degree and 180 degree. Truck runs great now
>>> except for one isse. It cam idle for hours and the temp never gets above
> O
>>> on the normal on the guage. Drive it 2 or 3 miles and the reading gets up
>>> to the A on normal. Radiator was clean inside, no crud flushed out of the
>>> block, and has 50/50 antifreexe mix in it. Soooo.. Where would all of you
>>> start on trying to isolate the problem. Tomorrow I am going to install an
>>> aftermarket temp guage to get an exat temperature reading. If it is high
>>> then what next? If it had a blown headgasket wouldn't I see water in the
>>> oil or oil in the radiator? It never makes the 13lb cap spew wter and I
>>> haven't pushed it that far anyways. Ideas and possible causes and trouble
>>> shooting ideas would be appreciated greatly
>>>
>>>
>>>
>>> Leo
>>> _______________________________________________
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