[Mgs] Running hot

[Robert's New iPad]

Hi Rick,
   You have been systematic about this.
   Good question about the opening of the new ‘stat.  As far as I know, they either open completely or not at all.  Others may know for sure.
   Sounds like you did all the right things with your efforts to clean the radiator.  I still wonder if it had sediment that solidified during the time the car was not in service.  Was that a long time?  Antifreeze in the radiator then? 
   Check the side-to-side temps of radiator.  If the sides and centre are not close in temp, I would suspect blockage in the sides. 
   Why the electric fan? My MGB with its yellow plastic fan was happy year round in Sarasota, admittedly not the heat of Houston, but I never had any worries. 
   Is fan turning the right direction? I have heard about that but never seen it.
Bob


> On Jan 30, 2021, at 6:38 PM, rolindsay at yahoo.com wrote:
> 
> Hi Bob,
>    Thanks for the kind words, considered thoughts, and recommendations. I quote (most of) your words here so as to not miss any salient points. 
> 
> > Those of us shivering at 9 degrees this morning, with a wind
> > blowing, almost wish we had your problem.
> 
>    LOL! I may be saying the same thing to you in 6 months, if with 90 degrees added to your 9!
> 
> > Same temp at radiator neck and ‘stat housing suggests
> > that the thermostat is working, though if you have any
> > doubt about it and do not know its age, you might consider
> > replacing it anyway.
> 
>    I agree, but at what flow level? Perhaps the thermostat, which is new, may be not opening fully. If restricting flow, the temperatures before and after the thermostat might equilibrate but without enough coolant flow to keep up with the engine's waste heat.
> 
> > Were you able to measure top/bottom, left/right the
> > radiator core temperature?
> 
>    Yes, but I didn't record the temperatures. I just verified that the bottom if the radiator was cooler than the top.
> 
> > If temp does not reduce from top to bottom, or there are
> > different temps at the same distance down from top,
> > you could suspect the radiator.
> 
>    I will examine further. When restoring the car I cleaned the radiator, inside and out, and straightened any bent 'fins'. I back-flushed the radiator with hose water then once the rinse water 'ran clear', I flushed it forward. Outside I sprayed the fins from both sides, with SimpleGreen then flushed it clean, back to front, with the water hose sprayer, again until the wash water ran clean.
> 
> > I have not had stellar success with radiator cleaning products.
> > My recommendation is to take it to a radiator shop and have it
> > cleaned and serviced.
> 
>    See above.
> 
> > What do you know about this water pump? 
> 
>    It is new.
> 
> > If, when your bring up engine temp from cold, with the rad cap
> > off, you do not see some swirling in top of the radiator, the water
> > pump is suspect.
> 
>    Will check, even though it is new (or perhaps rebuilt in China).
> 
>  Rick
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