Coolant Drain 2015 R31 (D4-300)

[JeffreyAC77]

Can anyone direct me to the proper drains to change out my coolant? TIA.

 

[abastos]

You can find detailed instructions in the Service and Maintenance, D4-D6 PDF. Download it from https://www.volvopenta.com/en-us/your-engine/manuals-and-handbooks/ using the engine serial number.

Pages 58 to 60. Preview below:

cooling-system.png

• abastos
• Jan 26, 2026

 

[JeffreyAC77]

I have found those diagrams - thanks. Are they the only two locations to drain the coolant on the D4-300 (2015). - pictures 1 & 3?

 

[DavidO]

I have found those diagrams - thanks. Are they the only two locations to drain the coolant on the D4-300 (2015). - pictures 1 & 3?

Note of caution. Those drain cocks are plastic and not available. So, be very careful and don't over tighten.

 

[JeffreyAC77]

Note of caution. Those drain cocks are plastic and not available. So, be very careful and don't over tighten.

Thanks for the warning. Are there only 2 drain locations to do the whole system on a D4?

 

[DavidO]

Sorry, not versed on the D4, just learned the hard way about the drain cock.