Dispatch blowers

[RPWC]

Wsrm air coming from blower vents when set on cold, turn it to hot and it blows hot. Only cold mot2 working properly. Any clues?

[RPWC]

Whem engine is cold, there is cpld air feom the vents, with the engine hot, and the vents swt to xold, the air is warm . Can amyone yhrow advice my way please? I was wondering about thermostat, but the heater works fine on hot .

[xantia_v6]

From you description, it sounds like the A/C compressor is not being enabled. You should normally hear a click from the compressor clutch about 5 seconds after the engine is started.

The most common cause for this is that the A/C system has lost it refrigerant, possibly due to a slow leak,, or perhaps a large leak due to a damaged component.

You have 2 options:
1. Take it to someone with a Citroen diagnostics reader to have the fault codes (and perhaps live data) read, to confirm the diagnosis. This won't fix the problem, but may prevent spending money on unnecessary work.
2. Take it to a generic A/C specialist to have the pressures read and refrigerant replaced. This may fix the problem quickly, but won't if the cause is somewhere else.

[GiveMeABreak]

Mike - just to confirm, there is no air conditioning on Rich's Dispatch.

I suspect the air mixing motor (s) gear has stopped working or snapped - leaving it in the same position. So when the engine is cold the air is cold, but when warmed up, it is just allowing the warmed air through - and changing the air mixing controls is making no difference - I will have a look at the details shortly and post up what I have.

[GiveMeABreak]

Part No 4 (647971) £55.85 from Citroen Inc. VAT This is the A/C Reduction Gear (still called the same even though you don't have A/C!

Here is where it should be located (No 11 in the second diagram. There are different versions - but in the same location - passenger side, to the right of the Blower Motor. It might be worth checking if there is a fuse for this first, or taking the trim away so you can see - and then operating the heater temperature controls and see if you can hear it moving the flaps - if not then this may be your issue.

[RPWC]

Thanks Marc , will look at it over weekend and report back

[RPWC]

Strangely enough ,when the temperature cooled down a bit yesterday, the air from the blowers was cooler, a tad warm ,but mostly cool. Is it possible the weather for s causingbthe air to blow warm.?

[GiveMeABreak]

As you don’t have Air Con Rich, and with these temperatures, it is a distinct possibility. It’s been raining here all week (I am in Wales, after all), but I understand it has been a little warm in other parts of the U.K.

The best way of checking is to wait until the evening when it is cooler and then run the engine until it is warm and then put it onto max heat and see if you get hot air coming through. Then put it back to cold and see if it cools back down. If so, then the gearing motor is fine and that confirms it is likely to be just the hot temperatures.

[RPWC]

As you don’t have Air Con Rich, and with these temperatures, it is a distinct possibility. It’s been raining here all week (I am in Wales, after all), but I understand it has been a little warm in other parts of the U.K.

The best way of checking is to wait until the evening when it is cooler and then run the engine until it is warm and then put it onto max heat and see if you get hot air coming through. Then put it back to cold and see if it cools back down. If so, then the gearing motor is fine and that confirms it is likely to be just the hot temperatures.

I did that the other day Marc, I went out at tea time and the blowers were on cold, the air coming out was cool,but not cold, by the time I reach d my destination 10 miles away, they were still cool. Although one has a little bit of warm air, they were mainly cool. After I switched off for a bit, then start d it again, they were still blowing cool,even though the engine was warm. When you turn the heat to hot, it blows hot air.

[white exec]

Sounds about what would be expected. Even on coolest, the air is being pulled in through scuttle and ductwork behind the dash, which will run a tad warm. The heater matrix will be fully up at coolant temp (c 90C), and even though the flap valves should not be allowing Cool Air to pass through it, it will pass near it, so will pick up a bit of warmth.

Other way to check is to park the car somewhere shady, and with blower switched on check the temp of the air being taken in (scuttle area?) and compare with what is being blown out. A similar check is sometimes done to see whether AC systems are pulling their weight.

[GiveMeABreak]

So that sounds normal then Rich.

Do I foresee your next post as "How do I retro-fit A/C"?

[RPWC]

Sounds about what would be expected. Even on coolest, the air is being pulled in through scuttle and ductwork behind the dash, which will run a tad warm. The heater matrix will be fully up at coolant temp (c 90C), and even though the flap valves should not be allowing Cool Air to pass through it, it will pass near it, so will pick up a bit of warmth.

Other way to check is to park the car somewhere shady, and with blower switched on check the temp of the air being taken in (scuttle area?) and compare with what is being blown out. A similar check is sometimes done to see whether AC systems are pulling their weight.

Will give that a look Chris.

[RPWC]

So that sounds normal then Rich.

Do I foresee your next post as "How do I retro-fit A/C"?

Ha ha not a chance, I won’t be going that far, perhaps the next van will have a c.