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Heater modification rover metro
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Jin
Posted 10/10/2015 9:48 AM (#719802)
Subject: Heater modification rover metro
Regular

Posts: 159
1002525
Hi all
So I understand that only cold air blows out the centre dash vents (actually I don't understand it - just accept it) but since mines a bit of a mess anyway, should the floor and screen be able to blow hot and cold or just hot?

And either way is there a modification I can do to either the ducting or heater box inside to enable all vents to blow hot and cold?

Done a search but can't seem to find an answer

Cheers
Dave 20VTRO
Posted 10/10/2015 9:09 PM (#719804 - in reply to #719802)
Subject: RE: Heater modification rover metro
Elite Veteran

Posts: 925
50010010010010025
Location: Thinking of vvc'ing my Roadster Brabus :-)
Jin - 11/10/2015 8:48 AM

Hi all
So I understand that only cold air blows out the centre dash vents (actually I don't understand it - just accept it) but since mines a bit of a mess anyway, should the floor and screen be able to blow hot and cold or just hot?

And either way is there a modification I can do to either the ducting or heater box inside to enable all vents to blow hot and cold?

Done a search but can't seem to find an answer

Cheers


The centre dash vents will only blow cold regardless. The screen, small upper demist vents and feet can be adjusted between hot and cold
as required.
Jin
Posted 10/10/2015 10:59 PM (#719806 - in reply to #719802)
Subject: RE: Heater modification rover metro
Regular

Posts: 159
1002525
Cheers bud, thanks for that, exactly what I hoped to hear, cheers.

God damn crazy system though lol
Marv_666
Posted 11/10/2015 8:35 AM (#719810 - in reply to #719802)
Subject: RE: Heater modification rover metro


'88 MG METRO 1300

Posts: 1117
1000100
Location: Dudley, Midlands		Could MAKE dash vents blow warm... IF you're stubborn enough to make it happen?!
Any parts you'd need to change the stock system simply don't exist though.
So without some proficiency with fibreglass or 3D printing you'll have problems!
Can get small 12v electric heaters/fans though, so could rig it up as 2 separate systems.
Normal stuff for up and down, new electric bits for dash taking an air feed from inside the car for recirculation.
Has the potential to get expensive and difficult... not likely to be worth the hassle.
Jin
Posted 11/10/2015 12:14 PM (#719811 - in reply to #719802)
Subject: RE: Heater modification rover metro
Regular

Posts: 159
1002525
Nah, I'll do it
Heater box is coming out tonight...
pickford
Posted 11/10/2015 12:56 PM (#719812 - in reply to #719802)
Subject: RE: Heater modification rover metro


Extreme Veteran

Posts: 586
500252525
Location: brighouse just shy huddersfield		Sorry to hijack but does anyone know if you can still get the resistors to fix the problem of the heater not working on 1 or 2 and only on 3?
Marv_666
Posted 11/10/2015 1:11 PM (#719814 - in reply to #719802)
Subject: RE: Heater modification rover metro


'88 MG METRO 1300

Posts: 1117
1000100
Location: Dudley, Midlands		Fair play! I quite like the odd mod that isn't worth the hassle!!
Make sure you take a lot of pics and detailed notes though...
as there may well be others that fancy a go if you figure out an easy way of doing it.

Pickford: half remember seeing that someone bought one from Maplins, was somewhere on the forum not FB.
Jin
Posted 11/10/2015 1:21 PM (#719815 - in reply to #719802)
Subject: RE: Heater modification rover metro
Regular

Posts: 159
1002525
No worries, will do
Jin
Posted 20/10/2015 7:19 PM (#719992 - in reply to #719815)
Subject: RE: Heater modification rover metro
Regular

Posts: 159
1002525
All done

The heater matrix uses 3 directional flaps to divert the air where required.
2 operate simultaneously opening and closing together from the hot / cold dash lever, the other controls flow to the demister and feet in that order.

Below is a photo of my heater box showing the interior passages and the 2 directional flaps that operate simultaneously





Excuse crummy drawings

Cold operation



Air passing in from the blower is directed to the open space above the matrix, the closed flaps sandwich the matrix allowing no air to pass through, instead the cold air passed right over the matrix and into the outer section of the heater box where it can pass through the dash vents or with control of the direction lever to the screen and / or feet

Hot operation



Air passing in from the blower is directed through the matrix via the upper directional flap, the hot air cannot enter the outer section of the heater box due to the lower directional flap closing this area off, instead the hot air is diverted to just the lower section of the heater box where it can pass through to the screen and / or feet

Modification

Cold operation



By removing the lower directional flap that covers the lower section of the matrix (the outlet if you like) the cold air can flow in exactly the same manner as before, no air is passing through the matrix so none is heated, the cold air can still be diverted also with control of the direction lever to the screen and / or feet as well as the face exactly as before.

Hot operation



With the lower directional flap that covers the lower section of the matrix removed and the dash control lever turner to HOT the upper directional flap opens allowing the cold air to pass through the matrix to be heated, the hot air now enters the outer section of the heater box where it can now pass through the dash vents or with control of the direction lever to the screen and / or feet, (I have shown the direction control flap closed but this still operates to blow hot air at the screen and/ or feet even with the dash vents open and you can meter how much flow is diverted through each outlet via the dash levers to produce an even flow through each if required.

The outer most dash vents don’t get a lot of flow if all the vents are open but they work ok if you just have the centre dash vents open and the feet screen off or vice versa – no real hardship to be honest however I have put a strip of self adhesive foam strip 4mm thick along the top of the upper control flap to open the gap up slightly keeping the flap from closing against the highest opening in the heater box (side vents) and this creates a seal to aid hot flow to it and prevent cold flow bleeding past.

I took a bit of time cleaning everything and replacing the foam seal because they were manky and the end result is a fully functioning air box that blows hot and cold to all outlets

The 2 flaps to be refitted





Hope that helps


Edited by Jin 20/10/2015 7:37 PM
joshmk4
Posted 20/10/2015 7:29 PM (#719993 - in reply to #719802)
Subject: RE: Heater modification rover metro


Regular

Posts: 145
10025
Location: Lincolnshire		Nice work on this, can't say I've ever been bothered by things like this but good job
Midas
Posted 20/10/2015 8:58 PM (#719995 - in reply to #719802)
Subject: RE: Heater modification rover metro


Regular

Posts: 208
100100
Location: High Peak Derbyshire		Having fresh air out of some face vents is a bonus in my book. Nice warm feet and a bit of nice fresh air to your face, just so long as you can close the vents if you want.
This a system that seems rare on new cars these days.
Jin
Posted 21/10/2015 1:57 PM (#720005 - in reply to #719802)
Subject: RE: Heater modification rover metro
Regular

Posts: 159
1002525
maybe, but since mine is the prototype Cortez, all heater box outlets are blocked off with only the floor and demist operational anyway.
since im redisigning the dash layout to take new face and demist vents i wanted to use the main opening for the centre dash vents to duct all the air required for the car with the exception of the floor so this was what i was wroking to when i discovered the main vent only blew cold air ..... till now.
Mad_shaun
Posted 17/8/2016 9:22 PM (#722578 - in reply to #719802)
Subject: RE: Heater modification rover metro


Veteran

Posts: 342
10010010025
Location: Radstock		Brilliant update
I am going to take mine apart as the flaps make a banging sound - how easy is it to remove the dash - and the heater box?
I also think that the cables are bent on my car so that the flaps dont go back properly
Shaun
Mad_shaun
Posted 17/8/2016 9:23 PM (#722579 - in reply to #719802)
Subject: RE: Heater modification rover metro


Veteran

Posts: 342
10010010025
Location: Radstock		Brilliant update
I am going to take mine apart as the flaps make a banging sound - how easy is it to remove the dash - and the heater box?
I also think that the cables are bent on my car so that the flaps dont go back properly
Shaun
Mad_shaun
Posted 17/8/2016 9:24 PM (#722580 - in reply to #719802)
Subject: RE: Heater modification rover metro


Veteran

Posts: 342
10010010025
Location: Radstock		Brilliant update
I am going to take mine apart as the flaps make a banging sound - how easy is it to remove the dash - and the heater box?
I also think that the cables are bent on my car so that the flaps dont go back properly
Shaun
Saxokid100
Posted 22/8/2016 3:33 AM (#722586 - in reply to #719802)
Subject: RE: Heater modification rover metro


dot dot dot Rally Spec

100252525
Location: Northwest		Very nice heater modification,will give this go too now..
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