No hot air

[Lea2kcaddy]

Hi looking for some advice, recently bought a 2010 ex BG caddy only blows cold air, I’ve stripped out the heater panel and found the part is missing and I have no idea where it goes to does anyone have a diagram of which part I need and where to put it? I will attach some photos it’s got AC if that’s any different. Cheers

[Lea2kcaddy]

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[Lea2kcaddy]

If anyone has a diagram, a picture of the part, or where it goes to would be appreciated, if I could switch it over to hot manually would be ideal!!

[Doc]

It looks as though the end of your positioning cable is disconnected in this photo.

That's for the vent/screen/floor position so won't effect if you're getting heat.

The heat diverter flap is on the yellow arm you've photographed behind the passenger footwell duct.

[Lea2kcaddy]

Thanks Doc! I’m aware I had popped the air diverted cable out it’s fitted back in now.

The heat control yellow bit you say? Strange that moves with an electronic part can’t remember which button moved it but can’t see where the cable would go

[Doc]

The yellow arm moves a flap to divert air through or around the heater matrix. If yours is moving then your problem with no heating might be coolant circulation related.
When the engine is warm, do the matrix pipes get warm behind the dash?

[Lea2kcaddy]

Yes definitely moving and switching from hot to cold. Both pipes top and bottom are hot. Had the engine running a good 20 mins now and it is getting warmer, on vcds engine coolant temp is only 71 degree C. Taking a long time to get upto temp, thermostat not opened yet and engine fan not kicked in, possible thermostat problem?

[Doc]

If the pipes are warm, it might be a circulation problem.
Check that when the engine is revved up your coolant pipe goes hard on the front of the engine. You'll need someone to rev it to check that.
Failing that, disconnect the flap motor and check the yellow lever is actually doing something. You should feel as though there is a weight on the end of the lever when you move it.

[BenT]

Without wanting to worry you, you might also want to check for a head gasket leak - this can lead to air locks in the coolant lines which prevents circulation through the heater matrix. With the engine stone cold, unscrew the coolant expansion tank lid. If you hear a gurgle when unscrewing it then this might be worth looking into, especially if you have oil in the tank too. Hopefully it'll be something simpler (like the thermostat sticking open - these do fail. A lot.).

[Dislexicdonkey]

Could this be the heater blower resistor? Should have hot air on level 4 blower though?

[Lea2kcaddy]

Hi the resister is fine as that controls the blower speeds, mine works on 1 , 2 , 3 & 4.

I have flushed through the heater matrix by removing the pipes at the bulkhead and running a garden hose through the matrix.

A lot of dirty rusty old coolant did come out and has made the blowers sort of hot but not 100% definitely an improvement though!

I will try another flush in the better weather,

I also changed the thermostat but that made no difference, the engines just take forever to heat up and that is somewhat normal for a deisel engine.


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[kammykhan]

as the heater core both pipes are hot in your case. i would start looking into the Motor flap, its not switching the flap to circulate the air through the heater core/ matrix.