Why does your car have an electric fan? I had a '74 MGB in Dallas and
it never overheated. The seats got very hot, but not the engine.
Are you sure the fan or fans are blowing air in the correct direction?
Have you tested your thermostat?
Have you checked that the radiator is really working? Check the
temperatures at the top and the bottom.
Simon
On Fri, Jan 29, 2021 at 6:14 PM <rolindsay@yahoo.com> wrote:
>
> Hello friends. I haven't written to bother you for a long time, but now I do
> so because I need advice. My recently resurrected '72 MGB's engine runs hot.
> It doesn't boil over but it 'overheats'. Here are the details from two tests.
>
> 1972 MGB, idling from cold start, bonnet open, 50:50 antifreeze mix, heater
> valve open, new water pump, flushed radiator, 10# radiator cap, timing set
> correctly, air:fuel ratio set correctly, carbs balanced.
>
> First day tests, w/o electric fan on:
>
> Time
> Since Coolant Gauge
> Start Temperature Reading
> -----------+â??--------------------+--â??----------
> 0 min 71°F minimum
> 1 min 72°F minimum
> 5 min 160°F 1/4 scale
> 10 min 195°F 5/8 scale
> 15 min 220°F 7/8 scale
>
>
> Second day tests, with electric fan on:
>
> Time
> Since Coolant Gauge
> Start Temperature Reading
> -----------+â??--------------------+--â??----------
> 0 min 63°F minimum
> 1 min 64°F minimum
> 5 min 159°F 1/4 scale
> 10 min 195°F 5/8 scale
> 15 min 228°F edge of 'H'
>
> Conclusions:
> 1. Engine starts easily, idles smoothly, and runs great.
> 2. No boil over in either test case.
> 3. Electric fan 'on' cannot overcome whatever is causing the car to run hot.
> 4. Temperatures measured at top of thermostat housing, but verified to be the
> same at the radiator top neck.
> 5. Charge is neither lean nor rich.
> 6. Timing is set correctly.
>
> What product might I use to flush debris from the block and head, if that is
> indeed the problem? Thoughts? And thanks.
>
> -Rick, in Houston, TX
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