Hi again Richard,

More info. I have found this lack of a shutoff valve is not accidental..despite Morgan hiring the design of the climate area to a local aftermarketeer. he merely followed the Ford template..sort of. The same complaint as yours are coming from everyone using the Ford system. Every Ford system the Cyclone era has no shutoff valve, thouhg most use a "heater control valve" that DOES NOT shut of all coolant from the cabin heater matrix! Without a shutoff valve the matrix is constantly hyper-heated passing that long to the cabin air. Ergo, the AC refrigerated air and the cabin are constantly heated. That is why the MMC has not addressed this issue in 17 years. Cabin air is typically 10F (US sources) over ambient air and dealers have informed owners that nothing can be done. The flow of warm air is beyond dealer or their owner control in any fashion without a remedial intervention. And BTW, THEIR internal controls are rusting as well.

Of course, we could simply conclude that our collective feeble intellect cannot fathom the undoubted logic of all this. innocent However, I can confirm that those owners and their local AC experts who have adopted a valve happily remark on the improvement whether AC is used or not. The only thing I can wildly speculate on is that Ford decided to supplement plastic radiator insufficiency by constantly using the cabin heater matrix as a second radiator. (A good trick in older trad in extreme heat situations.The trick can delay/stop boil-overs. Matrixes are merely smaller radiators. I do NOT suggest you touch either after the car has been running a bit with coolant flow. Sadly, this inexpensive method of making more profit (the current primary goal of all global manufacturing). Not to worry. I am not going to bother getting on a soapbox. (wryly) We merely must understand what manufacturing goals are to understand the products.
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On the subject of cooling, I must applaud the last rad designs of Peter Mulberry. He is/was the only Morgan designer in the community who was capable of thinking out of the box. Other designers constantly copied the traditional designs of the MMC in aluminum..at ever more absurd prices and carrying over the same faults. Peter's skill, experience and over-riding intellectual curiosity made him a true enthusiast. His last ideas moved radically away from the MMC template. He came to grips with the airflow issues through a tiny cowl and too small radiators. He was beginning to use much larger tubes. His performance Roadster 3.7 rad was a template he used for my mogs...a beasty LR 4.8 (no typo) with much more torque and bhp than a 3.7. No issues. Peter's products constantly improved through the 25+ years I have known him. I miss them.

gmg

P.S. We should soon examine Morgan aftermarket rads. The Chinese have entered the game putting what is reported to be very decent alloy rads on the market for as little as $179 or 245 pounds. They will soon take over the market. But they are copying the traditional design use from 1950s to 2010 which was never anywhere near perfect In fact it was abandoned by the MMC (sadly for another MUCH cheaper non-perfect product some time ago). I am not pointing a finger. We must merely adjust, as we do with everything, with reality as it is presented to us. I am told that a few of the Chinese suppliers are susceptible to advice.

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Last edited by gomog; 01/01/24 04:41 PM.