Talk Morgan Forums Morgan Sports Cars Morgan Plus Four, Supersport & Plus Six (CX & CXV Generation Vehicles) 2025 CX / CX-V Super Sports – Blower Fan Shutoff v

Vehicle: 2025 Morgan Super Sports (CX / CX-V Platform, BMW B58 3.0L)
Location / Climate: High ambient temperatures (27°C–37°C)
Hi everyone,
I am reaching out to see if any fellow CX / CX-V platform owners (Plus Four, Plus Six, or Super Sports) have experienced an intermittent, heat-induced electrical failure of the interior cabin blower motor.
I am trying to determine if there is an official Malvern software/hardware bulletin or firmware patch for this issue.
The Symptoms & Diagnostic Proof:
1. Normal Driving (27°C+ Ambient):
During continuous driving at speed, the A/C and blower fan function perfectly. Even during a run where the dashboard temperature display reached 45°C, the blower fan operated without dropping out as long as the engine remained running and moving.
2. The Failure Trigger (Stationary Engine-Off Heat Soak):
If the engine is switched off and left parked for 30–60 minutes in high ambient heat (27°C–37°C), heat radiating off the BMW turbo engine bleeds directly into the bulkhead/firewall.
3. The Failure & Recovery Behavior:
Upon restarting the hot engine, the blower motor suffers a 100% total electrical loss (zero airflow). Even when ambient or dashboard temperatures remained high at 33°C–38°C, the blower fan eventually came back to normal operation during driving—leading to the suspicion that road vibrations played a role in re-establishing a thermally disrupted electrical path.
4. The Controlled Experiment:
During a 15-minute idle stop, the dashboard temperature display spiked from 33°C to 45°C. By propping open the right-hand side of the louvered bonnet to let trapped bulkhead heat escape, the blower system remained 100% functional throughout. This confirms that active ventilation around the bulkhead prevents the lockout, whereas trapped engine-off heat triggers it.
5. Remote Door Lock/Unlock Controller Failure:
Additionally, you cannot unlock or open the right-side door lock using the remote controller when this thermal distress occurs.
Dealer Action to Date:
My dealer consulted Morgan and replaced the MID-module (Body Control Module), assuming a defective component.
Outcome: The exact same behavior recurred on the very next hot day.
Conclusion: The MID-module itself is not defective. Rather, static under-bonnet heat soak causes the module (or blower speed controller/relay/harness connection) to exceed its internal thermal safety threshold during its key-on diagnostic self-test, triggering a hard lockout until cooling airflow and road vibrations restore the circuit.
Questions for the Forum:
1. Has anyone else running a CX / CX-V generation car in warm climates experienced a total loss of the blower fan following hot engine-off heat soak?
2. Is anyone aware of an official factory solution from Malvern—such as a post-shutdown electric fan run-on software update, revised firewall thermal shielding, or an updated higher-temperature-rated control module/resistor/harness?
3. Has anyone successfully escalated this specific BCM thermal boot-up lockout to Morgan Technical Engineering?
Any insights, technical bulletins, or advice on factory escalation paths would be greatly appreciated.
Thank you!

My congratulations on your analysis. Your control was 15 minutes, but the issue mentions parking for 30 - 60 minutes. The parking is also at idle. I appreciate it's more awkward to leave at idle for 60 minutes and see what happens, but perhaps (a) idle for 15 minutes with the bonnet closed ... does the blower stay on? (b) after parking open the bonnet and leave it open ... does the blower function on restarting the engine?.

We've had mid-30's here in the UK for some weeks now, and I've not experienced the issue, nor heard of anyone else in the UK experiencing the issue. I doubt therefore that there would be an official factory solution from MMC, but I hope to be proved wrong by others on the forum!

Just to second High hamsters post.We had along weekend away a few weeks ago incredibly hot we had the air con and blower on all the time with many stops and miles covered and never missed a beat. I would suggest it might be a problem with your individual car. Its the one thing weve never had any problems with our Mogs. Oh hey so far......

Plus Six B58 engine. I have not experienced your fault (yet!), despite regular use in >30C, including lunch stops, with it parked in full sun.

Is it possible this may be CXV specific. Does the CXV chassis have a different bulkhead design, or location for the 'module'?

Thank you all for the quick responses and insightful comments—I really appreciate you sharing your experiences!
It is very helpful to know that others haven't run into this even in mid-30s ambient temps. That certainly points towards a specific component or thermal tolerance issue unique to my car rather than a universal platform bug.
My local dealer is currently investigating the issue further and is scheduled to give me an official update on August 24th. I will make sure to update this thread as soon as I hear back from them.
Thanks again for the input!