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[omega3000]

Check the main rad that its getting hot all over , any cold spots means partially blocked rad 

[amba]

Need to work at it systematically
First is the coolant bring pushed around so check flow:water pump
Is all areas getting coolant .flush system and check for cold spots or air locks blockages
Is thermostat operating as designed and opening
Is system running at pressure and no leaks etc
Are all electrical aides working as designed and us gauge registering the temp of coolant

[05omegav6]

Re the aux pump... That isn't entirely accurate... that pump only works when the engine is OFF to pump hot coolant through the heater matrix so you might use the heater when sitting in the car, say waiting at a level crossing, or when picking the kids up from school etc. It then only runs as long as there is sufficient heat to maintain the set temp.

It's possible the pump on the radiator is dead, so consider swapping those two pumps over. They are the same, and being never used, the one under the heater tank is pretty much guaranteed to work

Before getting stuck into the engine side of things, check the following:

1.Do all three fans run?
2.Is the HBV plumbed in correctly with vacuum hose attached?
3.When flushing, ensure the temperature is set to HI on both sides.
4.Are the arms to the blend valves attached/do they move when you adjust the temps on the climate panel?

If 2 and 4 don't work, you could replace the heater matrix, radiator, thermostat, water pump, aux pump on the radiator only to find no difference.

1,2 and 4 are all covered in the guides 4 being summat like ' Heater only working one side, how I fixed it'

HTH, Al

[powerslinky]

Pulled vac pipe from HBV   there is no vac  at this pipe   with heat on or off.   Presume that there should be at one or other .

Can anyone advise as too when vacumn should be felt at the HBV ?

Have flushed heater matrix  . . . little bit of brownish water  at first but clear & flowing really good    so thats ok 

[05omegav6]

Should be vac when set to LO

Disconnect the other end of the vac line and suck on it, you should hear the valve moving

[powerslinky]

Re the aux pump... That isn't entirely accurate... that pump only works when the engine is OFF to pump hot coolant through the heater matrix so you might use the heater when sitting in the car, say waiting at a level crossing, or when picking the kids up from school etc. It then only runs as long as there is sufficient heat to maintain the set temp.

It's possible the pump on the radiator is dead, so consider swapping those two pumps over. They are the same, and being never used, the one under the heater tank is pretty much guaranteed to work

Before getting stuck into the engine side of things, check the following:

1.Do all three fans run?
2.Is the HBV plumbed in correctly with vacuum hose attached?
3.When flushing, ensure the temperature is set to HI on both sides.
4.Are the arms to the blend valves attached/do they move when you adjust the temps on the climate panel?

If 2 and 4 don't work, you could replace the heater matrix, radiator, thermostat, water pump, aux pump on the radiator only to find no difference.

1,2 and 4 are all covered in the guides 4 being summat like ' Heater only working one side, how I fixed it'

HTH, Al

OK Al . . .  1.   only 2 fans running  . .  main one  engine side of rad   &  N/S front one  (battery side)  other front fan not working

2. HBV  seems correct as in maintenance guide diagram  but no vac at any setting ( could the cabin side of one of the pipes have come off ? )

3. Where do I find the blend arms        . . . any pics available 

[zirk]

Re the aux pump... That isn't entirely accurate... that pump only works when the engine is OFF to pump hot coolant through the heater matrix so you might use the heater when sitting in the car, say waiting at a level crossing, or when picking the kids up from school etc. It then only runs as long as there is sufficient heat to maintain the set temp.

It's possible the pump on the radiator is dead, so consider swapping those two pumps over. They are the same, and being never used, the one under the heater tank is pretty much guaranteed to work

Before getting stuck into the engine side of things, check the following:

1.Do all three fans run?
2.Is the HBV plumbed in correctly with vacuum hose attached?
3.When flushing, ensure the temperature is set to HI on both sides.
4.Are the arms to the blend valves attached/do they move when you adjust the temps on the climate panel?

If 2 and 4 don't work, you could replace the heater matrix, radiator, thermostat, water pump, aux pump on the radiator only to find no difference.

1,2 and 4 are all covered in the guides 4 being summat like ' Heater only working one side, how I fixed it'

HTH, Al

OK Al . . .  1.   only 2 fans running  . .  main one  engine side of rad   &  N/S front one  (battery side)  other front fan not working

2. HBV  seems correct as in maintenance guide diagram  but no vac at any setting ( could the cabin side of one of the pipes have come off ? )

3. Where do I find the blend arms        . . . any pics available 

Air Con on?

[05omegav6]

Re the aux pump... That isn't entirely accurate... that pump only works when the engine is OFF to pump hot coolant through the heater matrix so you might use the heater when sitting in the car, say waiting at a level crossing, or when picking the kids up from school etc. It then only runs as long as there is sufficient heat to maintain the set temp.

It's possible the pump on the radiator is dead, so consider swapping those two pumps over. They are the same, and being never used, the one under the heater tank is pretty much guaranteed to work

Before getting stuck into the engine side of things, check the following:

1.Do all three fans run?
2.Is the HBV plumbed in correctly with vacuum hose attached?
3.When flushing, ensure the temperature is set to HI on both sides.
4.Are the arms to the blend valves attached/do they move when you adjust the temps on the climate panel?

If 2 and 4 don't work, you could replace the heater matrix, radiator, thermostat, water pump, aux pump on the radiator only to find no difference.

1,2 and 4 are all covered in the guides 4 being summat like ' Heater only working one side, how I fixed it'

HTH, Al

OK Al . . .  1.   only 2 fans running  . .  main one  engine side of rad   &  N/S front one  (battery side)  other front fan not working

2. HBV  seems correct as in maintenance guide diagram  but no vac at any setting ( could the cabin side of one of the pipes have come off ? )

3. Where do I find the blend arms        . . . any pics available 

1. might be a relkay issue, or dependent on aircon working, won't help temp though.
2. might be a duff vacuum switch, possibly caused by a stuck hbv, or a faulty climate panel (ecu).
3. http://www.omegaowners.com/forum/index.php?topic=90575.0

[powerslinky]

Re the aux pump... That isn't entirely accurate... that pump only works when the engine is OFF to pump hot coolant through the heater matrix so you might use the heater when sitting in the car, say waiting at a level crossing, or when picking the kids up from school etc. It then only runs as long as there is sufficient heat to maintain the set temp.

It's possible the pump on the radiator is dead, so consider swapping those two pumps over. They are the same, and being never used, the one under the heater tank is pretty much guaranteed to work

Before getting stuck into the engine side of things, check the following:

1.Do all three fans run?
2.Is the HBV plumbed in correctly with vacuum hose attached?
3.When flushing, ensure the temperature is set to HI on both sides.
4.Are the arms to the blend valves attached/do they move when you adjust the temps on the climate panel?

If 2 and 4 don't work, you could replace the heater matrix, radiator, thermostat, water pump, aux pump on the radiator only to find no difference.

1,2 and 4 are all covered in the guides 4 being summat like ' Heater only working one side, how I fixed it'

HTH, Al

OK Al . . .  1.   only 2 fans running  . .  main one  engine side of rad   &  N/S front one  (battery side)  other front fan not working

2. HBV  seems correct as in maintenance guide diagram  but no vac at any setting ( could the cabin side of one of the pipes have come off ? )

3. Where do I find the blend arms        . . . any pics available 

1. might be a relkay issue, or dependent on aircon working, won't help temp though.
2. might be a duff vacuum switch, possibly caused by a stuck hbv, or a faulty climate panel (ecu).
3. http://www.omegaowners.com/forum/index.php?topic=90575.0

Thanks Al . . . . lots going on here . . . .  will get going on it   . . . but working again tomorrow  , so next week more likely

RE: the aux pumps  . . .  can I just test by pulling each electrical connector off & putting 12 volts to the 2 pins ? 

[05omegav6]

Yup re aux pumps

[zirk]

Re the aux pump... That isn't entirely accurate... that pump only works when the engine is OFF to pump hot coolant through the heater matrix so you might use the heater when sitting in the car, say waiting at a level crossing, or when picking the kids up from school etc. It then only runs as long as there is sufficient heat to maintain the set temp.

It's possible the pump on the radiator is dead, so consider swapping those two pumps over. They are the same, and being never used, the one under the heater tank is pretty much guaranteed to work

Before getting stuck into the engine side of things, check the following:

1.Do all three fans run?
2.Is the HBV plumbed in correctly with vacuum hose attached?
3.When flushing, ensure the temperature is set to HI on both sides.
4.Are the arms to the blend valves attached/do they move when you adjust the temps on the climate panel?

If 2 and 4 don't work, you could replace the heater matrix, radiator, thermostat, water pump, aux pump on the radiator only to find no difference.

1,2 and 4 are all covered in the guides 4 being summat like ' Heater only working one side, how I fixed it'

HTH, Al

OK Al . . .  1.   only 2 fans running  . .  main one  engine side of rad   &  N/S front one  (battery side)  other front fan not working

2. HBV  seems correct as in maintenance guide diagram  but no vac at any setting ( could the cabin side of one of the pipes have come off ? )

3. Where do I find the blend arms        . . . any pics available 

1. might be a relkay issue, or dependent on aircon working, won't help temp though.
2. might be a duff vacuum switch, possibly caused by a stuck hbv, or a faulty climate panel (ecu).
3. http://www.omegaowners.com/forum/index.php?topic=90575.0

Thanks Al . . . . lots going on here . . . .  will get going on it   . . . but working again tomorrow  , so next week more likely

RE: the aux pumps  . . .  can I just test by pulling each electrical connector off & putting 12 volts to the 2 pins ? 

If you know which Pin is + and -, sometimes easier to pull the relay cover off and make the contact by hand.

[powerslinky]

Happy days         

Ok guys   . . . have changed the HBV   ( had one anyway    )      now all working   really good .

When on HI    the heat is excellent   & on LO   blows cool . . . not really  cold as am having to run it on ECO  as the A/C needs looking at .  Compressor not kicking in , hoping thats just a re gas .

Running temp is also sorted      max temp on gauge is 90   fans kick in bring it back to 85 .

Tested aux pumps  . . . both work   but when should the one by the Rad switch in ?   as it does not seem to . is there a fuse to check for this ?


But delighted with progress so far   &  thanks to all who  advised etc. 
     

[05omegav6]

Nice one

Re the aircon... test the high pressure valve prior to doing anything else. If it still holds pressure, get it regassed first. No pressure then renew the valves and condenser prior to regassing not much else to go wrong with it after those three things, so might  as well start off right

Think the rad pump is as a final helping hand when the fans are struggling if the pump itself works, then I wouldn't fret it... it may even be triggered by the aircon so if that doesn't work then the pump may not...

[powerslinky]

Nice one

Re the aircon... test the high pressure valve prior to doing anything else. If it still holds pressure, get it regassed first. No pressure then renew the valves and condenser prior to regassing not much else to go wrong with it after those three things, so might  as well start off right

Think the rad pump is as a final helping hand when the fans are struggling if the pump itself works, then I wouldn't fret it... it may even be triggered by the aircon so if that doesn't work then the pump may not...

Al  , I'm thinking this test would be  done by  garage / aircon specialist  ?  . . or can I do it ? 

[05omegav6]

Unscrew the plastic cap on the aircon pipe to the bulkhead, then simply press the tip of a small screwdriver onto the valve.

If it hisses, then the system is relatively sealed so a regas should see it working again... no hiss = no gas pressure, so most likely condenser is shot, but prudent to change the valves as well whilst the system is empty