roberto230
Member
- Joined
- Mar 21, 2006
- Messages
- 15
- Reaction score
- 3
Guys,
I would appreciate your help as I have now read advice and watched youtube videos for 2 days.
Finally took a deep breath and took the duovalue apart on the car today. Car is a W124 4 cylinder petrol 2.3 1992.
Problem is hot air on passenger side and cold on the driver's. When finally opened up I cleared out as much as appeared necessary on the bronze valves and the seatings - mainly dirty rad fluid no solid bits - put all back together and same problem still exists.
I would like to understand some things before looking at the heater matrix and possibly reverse flushing.
To assist me undertstanding videos and earlier comments on this site can someone please help by confirming (or otherwise):
1 Hot water should flow towards the duovalve from the matrix and return to the block via the small pump (having entered the matrix from a single pipe on the passenger (battery) side.
2. For hot air it is essential to have a closed valve as determined by the 26 degree setting on the internal consule.
3. Closed valve means the stem controlled by the solenoid is in it highest position i.e not depresses against the spring.
4. The valve nearest the driver side wing (RHD) controls the matrix providing heat to the driver side vents in the car. I assume this as the higher of the 2 hoses from the matrix as this is colder than the lower hose which is warm.
Prior to dismantling today - I have tested the electrical connections to the dualvalve and only get a multimeter measurement when temperature settings are in the cold position. When in the cold consule control position and with ignition turned on there is a jolt from both domes when the connector is put into it's correct position by connecting to the 3 pins.
I don't want to move on from eliminating a problem with the duovalve prematurely but would appreciate advice to make sure I have done as much as can be done before reverse flushing the matrix or looking at temperature sensors.
Thank you.
I would appreciate your help as I have now read advice and watched youtube videos for 2 days.
Finally took a deep breath and took the duovalue apart on the car today. Car is a W124 4 cylinder petrol 2.3 1992.
Problem is hot air on passenger side and cold on the driver's. When finally opened up I cleared out as much as appeared necessary on the bronze valves and the seatings - mainly dirty rad fluid no solid bits - put all back together and same problem still exists.
I would like to understand some things before looking at the heater matrix and possibly reverse flushing.
To assist me undertstanding videos and earlier comments on this site can someone please help by confirming (or otherwise):
1 Hot water should flow towards the duovalve from the matrix and return to the block via the small pump (having entered the matrix from a single pipe on the passenger (battery) side.
2. For hot air it is essential to have a closed valve as determined by the 26 degree setting on the internal consule.
3. Closed valve means the stem controlled by the solenoid is in it highest position i.e not depresses against the spring.
4. The valve nearest the driver side wing (RHD) controls the matrix providing heat to the driver side vents in the car. I assume this as the higher of the 2 hoses from the matrix as this is colder than the lower hose which is warm.
Prior to dismantling today - I have tested the electrical connections to the dualvalve and only get a multimeter measurement when temperature settings are in the cold position. When in the cold consule control position and with ignition turned on there is a jolt from both domes when the connector is put into it's correct position by connecting to the 3 pins.
I don't want to move on from eliminating a problem with the duovalve prematurely but would appreciate advice to make sure I have done as much as can be done before reverse flushing the matrix or looking at temperature sensors.
Thank you.