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[Pete Elite]

Can anyone please answer me this ?

When i have my climate control set to OFF, both sides set to LOW and fan speed set to 4/5 would both of the pipes going into the Matrix be HOT or just the bottom one?(top is coldish).

 I ask this because if you remember i recently had a over heating problem which i thought i had sorted by cleaning out the system by using Wynn's coolant system cleaner and giving it a really good flush out but the problem has returned Arrrgh .

 I've had to pull the fuse on the driver's side A/C fan because it comes on as soon as i switch the ignition on and stays on even with A/C off and maybe this is what was keeping the engine at the correct temp. :-/ this might be a relay problem which I'm in the process of getting to see if it sorts it :-/.

   Any ideas as this is driving me to dispair .

           Thanks in advance,
                                       Pete .

[Andy H]

My assumption is that when the climate control is OFF then the heater bypass valve (HBV) should be shut to the heater matrix. There might be just enough leakage to make one pipe hot but leave the other one cold.

I don't understand how you can set a fan speed with climate set to OFF though :-?

[Andy H]

Oops - mini facelift - different climate system.

You didn't say whether you had set the controls to heat the cabin but if the fan was running at 4/5 and the HBV was open I wouldn't be surprised at a big temperature difference between the two pipes to the heater matrix.

[Pete Elite]

Oops - mini facelift - different climate system.

You didn't say whether you had set the controls to heat the cabin but if the fan was running at 4/5 and the HBV was open I wouldn't be surprised at a big temperature difference between the two pipes to the heater matrix.

  Thanks Andy H for your reply, i did put in my post that the heater was set to LOW(cold)on both sides .

  Can anyone give me a definite answer on this as i want to rule out the Matrix as the problem :question.

  Also I've noticed that when i turn off the ignition there are 2 -- in the left/right LED temp. windows, does this mean there is a problem with the Climate Control Unit and if so could this cause the engine to overheat/send false readings to the temp. gauge :-/.

   Help with this will be much appreciated .

       Thanks,
                  Pete .

[amba]

Hi Pete.....my climate panels both show --    -- when ignition is turned off..been doing this now for several months but climate and fans etc all are working correctly.
Kevin Wood did a full Tech 2 at the start of the yera and we felt that the sampler fan might be a bit lazy or even not working all the time so maybe that is what the fault is pulling up.?

[Ghost]

I also have -- when I turn the ignition off, The heater wont blow on the windscrean and the heating will only blow just a little over cold, any ideas?

[Andy H]

Oops - mini facelift - different climate system.

You didn't say whether you had set the controls to heat the cabin but if the fan was running at 4/5 and the HBV was open I wouldn't be surprised at a big temperature difference between the two pipes to the heater matrix.

  Thanks Andy H for your reply, i did put in my post that the heater was set to LOW(cold)on both sides .

Ooops again
If the heating controls don't want heat then surely the HBV should close & the heater matrix pipes go cold (a small amount of heat might still find its way into the flow pipe though).

I have forgotten exactly what your cooling problems are & what you have tried so far but;
1. heater problems can provide an early warning of general cooling faults but I think you need to be looking at the front of the engine.
2. IIRC the amount of heat rejected as heat by an internal combustion engine is about 60% of the engines useful power output so a 100kW engine will need to get rid of 60kW of heat through the radiator. The heater is good for between 5 & 10kW so the old trick of turning the heater on full can get you home if your radiator is marginal.
3. I have had two cars in which I have solved long running cooling problems by fitting a new, genuine radiator. The first was a chevette which had a tiny pattern radiator fitted. I spent weeks trying to find a cheap fix but a full size radiator fixed it. The second was a Carlton (Omega A) which was OK until a spell of hot weather had me driving 100 miles with the heater full on. I fitted a new genuine radiator a few days later and that fixed that one

[Pete Elite]

Oops - mini facelift - different climate system.

You didn't say whether you had set the controls to heat the cabin but if the fan was running at 4/5 and the HBV was open I wouldn't be surprised at a big temperature difference between the two pipes to the heater matrix.

  Thanks Andy H for your reply, i did put in my post that the heater was set to LOW(cold)on both sides .

Ooops again
If the heating controls don't want heat then surely the HBV should close & the heater matrix pipes go cold (a small amount of heat might still find its way into the flow pipe though).

I have forgotten exactly what your cooling problems are & what you have tried so far but;
1. heater problems can provide an early warning of general cooling faults but I think you need to be looking at the front of the engine.
2. IIRC the amount of heat rejected as heat by an internal combustion engine is about 60% of the engines useful power output so a 100kW engine will need to get rid of 60kW of heat through the radiator. The heater is good for between 5 & 10kW so the old trick of turning the heater on full can get you home if your radiator is marginal.
3. I have had two cars in which I have solved long running cooling problems by fitting a new, genuine radiator. The first was a chevette which had a tiny pattern radiator fitted. I spent weeks trying to find a cheap fix but a full size radiator fixed it. The second was a Carlton (Omega A) which was OK until a spell of hot weather had me driving 100 miles with the heater full on. I fitted a new genuine radiator a few days later and that fixed that one

  Thanks Andy H,
                         I suppose if push comes to shove then fitting a new Rad. will be my first port of call before next summer as it'll probably be OK during the winter months and if that don't help then keep on looking .

[Pete Elite]

Hi Pete.....my climate panels both show --    -- when ignition is turned off..been doing this now for several months but climate and fans etc all are working correctly.
Kevin Wood did a full Tech 2 at the start of the year and we felt that the sampler fan might be a bit lazy or even not working all the time so maybe that is what the fault is pulling up.?

  Thanks Amber,
                        I'll have to get a Tech 2 on it to find out if there is a problem or not .

  PS. Ghost Driver, best to get a Tech 2 check aswell .

[Matchless]

-- means that a fault code is stored.

The codes arnt very specific though, if there are several alleged 'faults' check that the connectors on the climate panel are fully latched home.

[Pete Elite]

Thanks Matchless .