Good thinking. Thanks for the tip!

__________________
-1985 300TD - 324k mi on chassis. MB "Tauschaggregat" 617 motor + 4-speed conversion
Alaska Roadtrip 2009
-2002 E320 Wagon - 197k mi
-1998 E320 Wagon - 310k mi - retired

If you have a damaged mono valve, please post pictures.

Here is a related thread.
Monovalve Issues (I think)


.

__________________
ASE Master Mechanic
https://whunter.carrd.co/

Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
HV-A/C Climate Control.
Vehicle build.
Fleet Durability
Technical Quality Auditor.
Automotive Technical Writer

1985 300SD
1983 300D
2003 Volvo V70

https://www.boldegoist.com/

no heat except at idle and around town speeds.

__________________
'83 300D - 261K | '97 Jetta - 209K | '63 Rivera - 22K | '86 C30 Dually - 105K

WTB: W123 Passenger doors - preferably Brown!