Reply To: Coolant water loss

[Bob CrossParticipant]

Hi Bernie and Philippe,
Just to report progress re my Big Six.
Unless I’m missing something the problem is cured!!!! wow!
1 I made a new rubber washer for the radiator cap
2 Gave the cooling system the Thermocure Treatment
3 Fitted the locally-made air deflector as Franssens no 331.074
An immediate improvement. On a sweltering day with the air temperature in the high twenties, with the Thermocure in the cooling system, I gave the car a blast on the M5 between junctions 3 and 4.The highest I could get the coolant temperature was 85 degrees. That was uphill and nearly 70m.p.h! I then turned off the M’way into a queue of stop/start traffic. Briefly the temperature reached 90 degrees – no problem. Back on the M’way. Again 70m.p.h, again 85 degrees. Stopped at the Services to open the rad cap. Looks good – no bubbling of the coolant – light foaming of the Thermocure solution.
A few days later I flushed the system.
I’ve just been out for an hours drive. Country roads-can’t get the temperature above 70 degrees. Then the real test on the M5, maintaining near 70 m.p.h. the temp just touched 80 degrees. Off the M’way parked in a lay-by and let the engine idle for 3-4 minutes, temperature still not getting above 82 degrees. Ok,the weather was cooler than last week 21 degrees – typical English summer temperature.
Thank you for your advice. I take from these results that I will not need a new radiator core in the near future -that’s a relief!. I’m still very interested in the electric water pump and slim-line fan – this could be a project for the Autumn.
I’m very grateful for your interest and advice
Thank you
Regards
Bob