Heater Control - Cold/Hot Flap Activation

[Gerry]

Hi Guys

Not a new subject I suspect but couldn't see anything relevant. Have a 90. But heating is nigh on non existent. Hotwater into and out of heater matrix as evidenced by both hoses being hot. My assumption is that the flap control from the hot/cold selector on the dash is not functioning. Fan multi-speed is also functioning.

So, here's my question. Where do you access said flap and where might one find the cable (?)
connection for it?

Have looked for diagrams but not found anything that was written for idiots (ME )

Any other thoughts folks?

Thanks
Gerry

[Alan Drover]

Evening Gerry.
I'm not familiar with the 90 heating system but I have looked through the workshop manual I have and can find nothing about the operation of the heater controls. The only thing I can suggest is to have someone operate the heater controls while you look at the cable on top of the heater matrix.
Big John is much more knowledgeable on this and I thought he would've replied. I suggest you send him a pm asking if he can help.
Sorry I can't help but there's no info in the manual.
_________________
Alan Drover.
1975 SWB hardtop with a 2.5 petrol engine, overdrive, front disc brakes, parabolic springs, hand throttle, Defender doors and Wolf wheels.
Also a 1977 Stage 2 MGB GT.

[Gerry]

Hi Alan

Many thanks for the response. I got it working last night with the info and exploded views I managed to glean off the interweb. Essentially, the cable was zip tied far too tightly and restricted the movement of the control flap between cold and hot. Also liberally doused the mechanism in WD40. HEAT...sheer bleedin' luxury!

On another note: this may require reposting elsewhere, but am sharing if not already known. The warning lamp panel on my dash only had the oil and battery lights illuminate with the 'lights on' symbol flashing on/off intermittently. Assumed it might be connectors or wiring. Checked connectors and applied contactor spray. No joy. Checked wiring and noticed if harnesses moved this affected lights. Long story short. Removed PCB and a colleague who's an Electronic Tech, checked the solder on the PCB side connector pins. Virtually every one showed solder cracking around the circumference of the pins. All re-soldered and hey presto. I have a full array of functioning warning lights. Landies do suffer with....ahem...a spot of NVH...

NB. you will need a magnifying glass to view the state of the solder on the PCB.

[websnail]

[BigJohn]

Well done with the heater. I did read your post, but got way laid with something else at home and forgot to give some advice on what to look for - Sorry.
The wiring on early 90s and 110s gets fairly dodgy with age, particularly the connectors in the offside rear of the engine bay. I have a few bypass links in mine which need to be fixed properly, when I get time to do it.
_________________
110 CSW 2.5 Petrol (soon to be gone).
TD5 Discovery.

Member 9329 (re-joined the club)

[Gerry]

Hello Chaps
Thanks for all your responses, etc. Have emailed Frank as some things maybe beneficial if included in the mag. Greater audience.....hopefully.

No doubt I'll be hounding you more knowledgeable types as I discover my, errrr, limitations.

Got a Flickr account so will need to have a look at the FAQs on here to get to grips with how I inundate all and sundry with pictorial nonsense!

[ACR109Series2.5]

I've a late debender heater in my 109 so I know a little. What I can add is that the matrix on these gets easily clogged with age, and not being the best in the first, if the original factory fit is still in there, a newby will help.

Also the fan motor gets a bit lazy, or collects crud, so won't belt out the volume of air they do when new.

Be aware there are two heater matrix, the early version has cranked pipes, the later more grunty version straight exit pipes.

I bought one in better times, if you're feeling flush there is/was an aluminium beefed-up matrix available. Good but silly money.

[Gerry]

Hello Big Talker. Thank you for the advice. Every scrap of info is gold I'm finding!