Heater Hoses Replacement

[n/a]

I am planning to replace the hoses that connect from the engine to the heater.  I would like some advice on whether I need to drain the coolant to do this.  If I do not drain the coolant, how much will I lose?

Louis 70 280sl Red Auto

[rwmastel]

When was the last time you drained the coolant?  It should be done every 2 years, I believe.

Rodd
Powell, Ohio, USA
1966 230SL, Euro, Auto, Leather, both  tops
1994 E420

[n/a]

The coolant was replaced about year and a half ago. I want to know if I need to plan to replace them.

Louis 70 280sl Red Auto

[Naj ✝︎]

quote:If I do not drain the coolant, how much will I lose?

Just about whats in the matrix and hoses, maybe 1 liter

naj

65 230SL
68 280SL

[ted280sl]

Louis,
  The heater hoses are about the highest point of the cooling system. If you drain some coolant out you will be OK. The real challenge is re-filling they system and getting the air out. Some of our cars have a bleeder bolt on top of the thermostat.
Regards,
Ted 1969 280SL

[n/a]

Thank you for the help. I will drain some coolant before I start.  I am planning to replace the thermostat anyway.

Louis 70 280sl Red Auto