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Matt, Mechanical Engineer
Category: Car
Satisfied Customers: 22893
Experience:  BEng hons Mech engineering, in auto industry 22 years
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Citroen berlingo van overheating 1.9 diesel 2003 Water pump

Customer Question

Citroen berlingo van overheating 1.9 diesel 2003
Water pump done
Oil level fine
System bled and new coolant
Pipes/ radiator, radiating heat. Only just bought the van so don't know if this was an issue before, next step is to change the thermostat or the fan maybe all this was carried out by a mechanic, just don't want to keep throwing money at it. Mechanic as had the van ticking over for a couple of hour and for a short drive and typically didn't go above 90 :( has normally been going on the notch just above 90. Seems more likely to do it when driven hard up a hill then going into stop start driving. Or coming of the motorway, then hitting traffic and going in to stop start driving as if may not be flowing correctly. Any suggestions?
Submitted: 2 years ago.
Category: Car
Expert:  Matt replied 2 years ago.
Hello replacing the thermostat is the next step and whilst the thermostat is being replaced you might as well also reverse flush the cooling circuit (remove top hose to rad and use a hosepipe to push water into the engineuntil you get clear water out of the radiator hose) and top up with 30-50% fresh antifreeze. Also check that the small diameter bleed hoses that run from the top of the radiator and the top of the engine aren't blocked as this allow the air to vent back to the header tank automatically
Customer: replied 2 years ago.

Doesn't the thermostat normally fail open or shut could it not be the sender unit or the fan?


Expert:  Matt replied 2 years ago.
Hello Lewis

thermostats can fail; open, shut and anywhere in between
so that woudl be the 1st thing I'd replace