S60 D5 weak heating - Page 2

tom570 · Feb 19th, 2024, 08:49

Thanks for all replies and inspiration. Currently I suspect my cap of the coolant tank can be faulty. I noticed there are remains of dried coolant around the cap and sometimes I can hear soft sounds of gurgling or bubbling from the cap after driving the car.

Is it possible the cap is letting the air in and out constantly and as a result there is not the proper pressure in the cooling system? Can that cause the weak heating? Thank you again!

tom570 · Feb 26th, 2024, 11:12

I am very happy to report that my heating problem is solved, it was actually the coolant cap. I had no idea that it has such an important function and that over time the overpressure valve would start leaking permanently and would not maintain overpressure. I found somewhere that the estimated lifespan is around 5 years. My cap was original, it is marked with the month of production 08/2005

Thank you very much for the valuable advice!!

Feb 19th, 2024, 08:49	#11
tom570 New Member Last Online: Mar 14th, 2024 22:26 Join Date: Oct 2023 Location: Prague	Thanks for all replies and inspiration. Currently I suspect my cap of the coolant tank can be faulty. I noticed there are remains of dried coolant around the cap and sometimes I can hear soft sounds of gurgling or bubbling from the cap after driving the car. Is it possible the cap is letting the air in and out constantly and as a result there is not the proper pressure in the cooling system? Can that cause the weak heating? Thank you again!

Feb 26th, 2024, 11:12	#12
tom570 New Member Last Online: Mar 14th, 2024 22:26 Join Date: Oct 2023 Location: Prague	I am very happy to report that my heating problem is solved, it was actually the coolant cap. I had no idea that it has such an important function and that over time the overpressure valve would start leaking permanently and would not maintain overpressure. I found somewhere that the estimated lifespan is around 5 years. My cap was original, it is marked with the month of production 08/2005 Thank you very much for the valuable advice!!

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