Engine Temp High reduce speed

taxi driver · Sep 13th, 2021, 14:42

Been having some engine temp problems with my V70 163BHP 2010. Thermostat and temp sensor have been changed. Live data shows temp of 112deg providing I switch A/C off and drive at 55-60 mph.
Last week I took the car for diagnostic check at non-franchise Volvo and they reported the following.
1) Glow plug relay faulty (Glow plugs working on 2 cylinders) All new fitted 6 months ago
2) Regen unsuccessful
3) Cooling fan control errors.

I spoke to the mechanic and he explained that the glow plugs are used to carry out a regen, in my case this was not being completed and the car was constantly running hot trying.
The cooling fan control unit was not switching the cooling fan as and when required.
This all makes sense, I was aware when starting in cold weather the engine was lumpy.
3 days later and they haven't got back to me with a price.
A few questions:-
Does a new relay need to be coded to the car? If not where is it situated? and can I just replace it?
If I can replace the relay Is it possible to jump the cooling fan control unit? for test purposes to try and force a regen? (100% fan).
Thanks

Sep 13th, 2021, 14:42	#1
taxi driver Junior Member Last Online: Sep 11th, 2023 15:06 Join Date: Dec 2004 Location: Northants	Engine Temp High reduce speed Been having some engine temp problems with my V70 163BHP 2010. Thermostat and temp sensor have been changed. Live data shows temp of 112deg providing I switch A/C off and drive at 55-60 mph. Last week I took the car for diagnostic check at non-franchise Volvo and they reported the following. 1) Glow plug relay faulty (Glow plugs working on 2 cylinders) All new fitted 6 months ago 2) Regen unsuccessful 3) Cooling fan control errors. I spoke to the mechanic and he explained that the glow plugs are used to carry out a regen, in my case this was not being completed and the car was constantly running hot trying. The cooling fan control unit was not switching the cooling fan as and when required. This all makes sense, I was aware when starting in cold weather the engine was lumpy. 3 days later and they haven't got back to me with a price. A few questions:- Does a new relay need to be coded to the car? If not where is it situated? and can I just replace it? If I can replace the relay Is it possible to jump the cooling fan control unit? for test purposes to try and force a regen? (100% fan). Thanks

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