Gents, can I ask if anyone could tell me how the heating output control on a classic actually works? I know in the olden days you'd have a cable to a valve in the matrix circuit that would regulate flow of coolant through the matrix to hat up/cool down. This is on an '05 classic with rotary dial dash and aircon.

Thanks

JB

yep there is a cable in there indeed mate

how does it actually work though? I mean, does it regulate hot coolant entering the matrix or does it do something with the heater assembly to affect the temperature of the air produced?

its just a cable to regulate the cold and hot air mix like any other

why u asking u still got issues i rember u had problems with the blower or something before

Exactly that.
It's a thai import with aircon.
Has a solenoid valve in the heater hose circuit which is energised by the aircon button. No aircon compressor switched on = no heat. Switch on aircon compressor = live to the solenoid and heat.
But.......
It's either hot, or cold, with no in between. Completely uncontrollable.
So my idea was to run an ign live to the solenoid valve so it stays open all the time (presumably then allowing the matrix to get hot). This stops the need for the aircon compressor being switched on (or I could remove valve and join hose, or I could disconnect feed to aircon pump clutch) but I would still not have control over the heat regulated. It can't be a snapped cable as when the dial is turned to cold it goes cold (freezing if aircon is switched on).

do u want the cooling and heating manual mate?

cant see much need for heating in thailand tbh

That would help me get an understanding of what I am dealing with so yes please.
My thoughts exactly about Thailand.

hang on let me find ya a link

thx

@jonnyboy54321 http://www.silent-cities.com/L200forum/L...VENTILATION.pdf

have fun reading

thanks for that, appreciated.

no worries bud hope it helps

I think what I will do is disconnect the ac pump clutch as a test - but switch on the ac then see if I have any controllability of temperature. I notice there is a thermostat in the AC system too which could be providing a red-herring of course.
Will check back in tomorrow! Thx

no probs mate look forward to hearing the results

i dont have AC old school system

coat and window !!

ha ha heating gets hot man no need for a coat window and drive in y fronts for the 2 or 3 days of the year we get it hot

Mine was like yours until someone bodged the shit out of it. (Previous owner). I sorted it all out by removing the in hose valve and fitting a manual centre heater box. Took some doing but it all works now.

When you twist the heater temp dial it should move a cable connected to a variable switch on the left side of the centre heater box. This then sends voltage to the in hose valve and should control it's position.

@Mallinman
do you mean yours was something like this ?

It was half like that mate. All those bits was there but they weren't wired up right and they didn't work properly. And all the cables from the heater controls were not where they were supposed to be. It was a right mess. Does the temp dial cable go to that slider in the top picture??

yes it does.
So if I am right in what I am presuming, does this mean that both your truck and mine are supposed to operate the heat control by varying how open the solenoid valve in the hose circuit is, as opposed to what seems to be "normal" ie the heaterbox. ?

Wenn Sie hier auf Links zu eBay klicken und einen Kauf tätigen, kann dies dazu führen, dass diese Website eine Provision erhält.

Yes that's correct bud. It's done by the valve. And there is just an open heater matrix in the centre heater console. As opposed to the other way where the temp dial operates a flap in front of the heater matrix (which is constantly hot) that regulates the flow of air either past it or around it depending on what temp u want. Mine was so bollocked up by the previous retard that I took out the electrical thermostat that the temp dial goes to. It didn't have the valve in the heater matrix pipe. It wa just hot all the time. Shite in summer. I then replaced the centre heater console with the other flap type. Now I get hot and cold with the flick of a dial. It was a straight swap and just moved the cable round. Bout £50 for the console off eBay.

Looks like that may be the way forward.
Am very proficient with tools ish, how long did it take you to get the dash out box swapped and back in? ish?

A day mate. With lots of lager stops. Just tape up the electrical connecters and mark em for easy re-installation. And take front seats out. Only 8 bolts and gives u loads more room. It's not a difficult job.