friedhelmhartmann1
V50 Engine Overheating Slow Warm Up
Summary of the thread
The 2011 Volvo V50 is experiencing engine overheating and slow warm-up times. The core problem could be a defective thermostat or issues within the cooling circuit. A possible cause is a malfunctioning map thermostat, which is electronically controlled and can affect engine temperature regulation if it fails. The suggested solution is to check for coolant leaks and consult a workshop for diagnosis and repair.
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4 comment(s)
friedhelmhartmann1 (community.author)
Thanks for the quick response. I haven't checked for coolant leaks yet, but I will now. Is the 'map thermostat' the same as the regular thermostat, or is it separate?
hermannschmitz8
The map thermostat is the thermostat, but more advanced. Instead of only reacting to coolant temperature via a wax element, it also has an electrical heater controlled by the engine management. This lets the engine management force the thermostat open earlier at high load. If the electronics fail, the thermostat might not open properly, or stay open too long. Given your symptoms, it's likely the source. I'd advise consulting a trusted workshop rather than doing repairs yourself.
friedhelmhartmann1 (community.author)
I appreciate the detailed explanation! I suspected the thermostat, and your information confirms it. I'll take it to a workshop for diagnosis and repair. Thanks again for your help!
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VOLVO
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V50
hermannschmitz8
Sounds familiar, had a similar issue with my V50. Overheating and slow warm-up times are often related. Have you checked the thermostat housing for coolant leaks? A defective map thermostat can cause these problems. It's electronically controlled, so if that fails, engine temperature regulation suffers.