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[Marie]

Cant seam to find anything when searching about this but

my heater works fine blows hot and cold can turn it on and off just when i turn the nob to change the blower position i.e from windscreen to feet / face ect nothing happens? any one got any ideas

[TheBoy]

Check for vac issues around there

[Marie]

Check for vac issues around there

i am going to sound like a bird now whos blonde

how do i do that .....please explain and how do i fix it? lol

[TheBoy]

Unlike the ECC ones which are (electric) servo controlled, the manual is vac controlled.

Possibly worth checking the engine bay vacs are all in order first - no leaks, correctly plumbed etc.

Then panel. Never removed a non ECC one myself, but would suspect it should all become clear - the direction dial simply diverts vac to different flaps.

[Marie]

Unlike the ECC ones which are (electric) servo controlled, the manual is vac controlled.

Possibly worth checking the engine bay vacs are all in order first - no leaks, correctly plumbed etc.

Then panel. Never removed a non ECC one myself, but would suspect it should all become clear - the direction dial simply diverts vac to different flaps.

okay cool havent a clue what im looking for though, is this all separate to the cooling system ....

[TheBoy]

hot air (from heater matrix) and cold air (fresh) are blended by a flap to produce desired temp. This is then ducted away, and aimed at different vents, again by flaps.

Hope that makes sense?

Hopefully someone who has dismantled a manual one can provide further guidance on what to expect

[Marie]

i hope so too someone on here must have had this problem and fixed it surely

TY

MR HAynes isnt very helpfull at all lol

[tigers_gonads]

I'd have a good poke around the back of the engine bay (near the hbv) first.

Could just be a case of a vac pipe that has been pulled off 

When your engine is running and twist the knob to move the air about to the different vents, can you here it hiss ?

[Abiton]

From memory, once you have disassembled enough to see the back of that selector dial, all becomes clear.  I seem to recall there's about 4 or 5 vac hoses all push-fitted onto the back of the 'switch', and as you turn the dial the 'source' hose gets connected to one of the others, to power the appropriate flap mover. 
I can't remember the colouring (yellow?) of the source hose which comes through from the engine bay, but obviously if that has no suck with engine running, the problem is further back towards the engine. 

I reckon you'll find that this hose has fallen off the back of the switch/dial, or it has become disconnected at the point where it comes through the firewall into the driver's footwell, in between the alloy matrix-connecting pipes.  Check the latter first, I think you can just get to it without any disassembly, but it's been a while. Torch and contortionism probably required.

[Marie]

I'd have a good poke around the back of the engine bay (near the hbv) first.

Could just be a case of a vac pipe that has been pulled off 

When your engine is running and twist the knob to move the air about to the different vents, can you here it hiss ?

nope no hiss

[Marie]

From memory, once you have disassembled enough to see the back of that selector dial, all becomes clear.  I seem to recall there's about 4 or 5 vac hoses all push-fitted onto the back of the 'switch', and as you turn the dial the 'source' hose gets connected to one of the others, to power the appropriate flap mover. 
I can't remember the colouring (yellow?) of the source hose which comes through from the engine bay, but obviously if that has no suck with engine running, the problem is further back towards the engine. 

I reckon you'll find that this hose has fallen off the back of the switch/dial, or it has become disconnected at the point where it comes through the firewall into the driver's footwell, in between the alloy matrix-connecting pipes.  Check the latter first, I think you can just get to it without any disassembly, but it's been a while. Torch and contortionism probably required.

 thank you im good with contortionism 

ill finish my house duitesand if theweather holds out have a look later hubby is going to freak he he

[tigers_gonads]

I'd have a good poke around the back of the engine bay (near the hbv) first.

Could just be a case of a vac pipe that has been pulled off 

When your engine is running and twist the knob to move the air about to the different vents, can you here it hiss ?

nope no hiss

If you have been pokeing around the engine bay, i'd check the vac pipes first under the bulkhead around the hbv and were the vac pipe goes threw the the bulkhead.

They don't tend to fall off the back on the heater controls unless you have been messing around up there 

[Marie]

I'd have a good poke around the back of the engine bay (near the hbv) first.

Could just be a case of a vac pipe that has been pulled off 

When your engine is running and twist the knob to move the air about to the different vents, can you here it hiss ?

nope no hiss

If you have been pokeing around the engine bay, i'd check the vac pipes first under the bulkhead around the hbv and were the vac pipe goes threw the the bulkhead.

They don't tend to fall off the back on the heater controls unless you have been messing around up there 

thank you Tigers but this problem has been with us for a while and i actually havent had to go that far back in the engine bay but ill still look before dismantliing the inside of the car although i dont actually think my back is going to allow me too today think my body is telling me to give it a rest 

[Kevin Wood]

The vacuum supply should come from an outlet near the non-return valve in the brake servo vacuum pipe. From here it goes to an accumulator under the scuttle next to the pollen filter and from that down through the rubber grommet where the pipes to the heater matrix enter the cabin.

I would check that you've got a decent vacuum here for a start. Often the rubber elbows at each end of the plastic pipes can crack and the non-return valve in the accumulator can go faulty.

A gunson "lo-gauge" is handy for checking the vacuum if you have one. At the output of the accumulator the vacuum should build after starting the engine and remain for some minutes after stopping it.

Also check the line from the grommet in the bulkhead to the HBV, if fitted. If there's a leak here the vacuum could be depleted causing everything else to stop working.

If and when that all checks out OK, it's time to have a poke around behind the heater panel. I'd try sucking on the supply pipe to the heater selector in each position, and see if you can get the flaps to move. Any leaks should be obvious at this point.

[Marie]

Thought i would do a follow up for those who end up searching at a later date for a solution.

when looked into my fault further we found 3 issues,

1. at the back of the engine we found the pipe had snapped off the value ( cant remember what it called mark did tell me) it was a pig to remove and i have small hands
    unit changed with the help of MARK DTM cailb.

2. once unit was remove mark confirmed its was actually tits up any how. but had a sparewith him.

3. behind the sterio the yellow and black pipe line had become crimped at a t peace so snipped end off and replaced tube.

JD i can now change the setting inside the car  :ycheers guys