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Aussie, I have the Spanish STX550 3LTR Diesel so different, but had all the same symptoms, mine I eventually found to be a blown fuse in the IPDM, controlling the fan, I think yours has bi-metallic control. I threw a lot of parts at it before I discovered the fault. Installed an after market...

Barney, what vehicle have you got?

Just in case there's anyone with a Spanish built STX with the V6 Diesel, I was having the same symptoms, replaced thermostat, water pump, radiator, electric/viscous fan hub assembly, Spanish model doesn't have an electric fan, had checked all fuses, and even had an auto sparky check, still no...

Had the same symptoms when towing caravan, replaced thermostat, radiator, viscous fan, water pump, had checked by an auto sparky, who could not find any problems. Purchased a bidirectional diagnostic tool that showed outputs like fan speed and coupling % which proved that fan was failing to...

I had exactly the same symptoms, owner I purchased from had removed the thermostat, so tried all the simple things first, thermostat, replaced viscous fan oil, flushed radiator, all seemed to improve the temp until I towed the Caravan, recently purchased a new radiator, and while replacing...

Cheers for that Tony, much appreciated.

GMG, where did you find the GCM and other figures from? I've got a 2013 STX550 and I can find the GVM on the plate on passenger mid pillar, states 3010, axle weights are in the owners manual, but can't find GCM. Cheers Jim

Sometimes an excess of cooling and a stuck open thermostat can cause overheating. I used to fix large tractors, that do all their work at low speeds so have huge radiators and fans, often when a farmer complained of overheating I would find the thermostat stuck open, this seemed...