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V70 2.4D Running Hot

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Old Oct 17th, 2021, 13:26   #11
cheshired5
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Quote:
Originally Posted by 37 RUBY View Post
With regards the cooling circuit flow, does the heater circuit hold enough capacity and if blocked likely have an effect on what the main cooling system is doing? if the heater controls are set to cold, theoretically it's not involved in engine cooling - or is it on this vehicle?
The cooling system through the heater core is constant flow regardless of the position of the cabin heater controls.
If the heater core is blocked or restricted, this will impact on heater performance and the coolant temperature won't be regulated as designed.
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Old Oct 26th, 2021, 23:40   #12
Black dog
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Originally Posted by cheshired5 View Post
The 2 hoses are on the back wall of the engine bay so coolant can flow in and out of the heater core in the cabin.

Access to feel hose temperatures is normally decent.
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Originally Posted by cheshired5 View Post
The cooling system through the heater core is constant flow regardless of the position of the cabin heater controls.
If the heater core is blocked or restricted, this will impact on heater performance and the coolant temperature won't be regulated as designed.
Agreed. It's also quite common for many of the modern Vag brand crap to block the matrix and over heat.
The water flow goes through the matrix to the back of the thermostat providing the heat to open the stat, when the matrix blocks the stat won't open and the heat rises heating the head more than the block.
If I was the OP I'd bypass the matrix and take it a run
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Old Feb 9th, 2022, 23:45   #13
taxi driver
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Today I removed the cover in the engine bay under the windscreen to gain access to the heater pipes passing through the bulkhead. Both pipes have a connector attached as they go into the bulkhead, they are located directly below the A/C pipes and flange. I am wondering if I'm better off cutting these pipes to flush the heater. I know its a long shot, anyone know the internal size of these pipes so that I can re-connect after cutting?
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Old Feb 10th, 2022, 07:51   #14
MCFastybloke
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Iffy temp sender?
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Old Feb 10th, 2022, 13:05   #15
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New genuine temp sender fitted.
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