#$$%my Great Luck again! I am not scheduling any surgery for a Longggggggg time. With my luck I would go in to get my tonsils taken out and end up missing an organ..

My 85 300D temp controller issues hot air on 90 deg day!As of Friday ice cold AC came from the ducts. Is there a way to

(1) Temporarily repair the board like a jumper? I was so po'd I was going to disconnect the heater hoses from the haeter core and join them together.
I also thought of disconnecting the electric connector from the monovalve.

(2) Permanently fix the board without replacing it?

(3) My only other solution is to go under the pass dash , pull the glovebox, and play with the dampers and flaps...

if you pull electric connector from mono valve = full heat at all times.....

This will work during summer:
disconnect the heater hoses from the heater core and join them together.

__________________
ASE Master Mechanic
asemastermechanic@juno.com

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
1984 190D
2003 Volvo V70
2002 Honda Civic

https://www.boldegoist.com/

RU sure it is the temp controller?

Don't unplug the monovalve.

__________________
Jim

RU sure it is the temp controller?

Make sure the monovalve is working and hard wire 12vdc to it.

__________________
Jim