How much water can a heater box hold?

[transexl]

Guten Morgen

I am not about to test that on my own box, mind you!
And I am aiming at something slightly different, in fact - let me put it this way:

Is the heater box designed to cope with water that gets inside :?:

Lets say the box is in perfect "working like new" - order.
The car is washed or it is raining VERY hard. The two top draining holes on the upper surface, that lead to the rubber elbows and then to the outer draining hoses, can not manage the amount of water. The excess makes its way into the top (inlet) flap or ANYWHERE else into the box.
What happens?

The question was fueled by the little drain (?) tube that is worked into the fan motor housing lid, you know, the elegantly curved one that faces to the inlet manifold. Why is there a tube leading out of the box on this side, but not adjacent to that, where the straight lid closes the other part of the box towards the front?
In fact: that the box is not desifgned to let out water from its lowest level - somewhere through the bulkhead, straight down so that nothing can stand inside - does suggest that it can NOT cope with having ANY water inside, right?

I cannot wait for an answer!!!

Have a good weekend :!: :!:

stefan

 

[Pilkie]

There is a drain point at very low level,but it might not be the lowest the water can get to.
It is on the opposite side to where the matrix is,on a curved under section.
If you also look in the top with the vent open you can see it.

 

[transexl]

That is the pipe I meant.

Why is it there but NOT on the other side, to the right on your pic? That part of the box is enclosed or completely separated from the left side and therefore has NO drain... .

I thought that the pipe you point at - THANKS for the pic!! - might be for air?

Mind you, the question remains:
what does a heater bos do with water getting into it?

 

[Pilkie]

Water should not be able to get into that side of the box,as the flow of air "or any water" goes in the top,then to the side chamber "where the drain is" then through the fan and into the car.
The fan housing prevents water getting into the car.
The sections below the main top flap are the sealed and boxed in matrix and lower directional vent flaps that the air is blown through.
Only if you get a build up of dirt and then it rusts,will water get into the car via the flaps.
Also water will get in if the matrix is leaking.

 

[transexl]

Pilkie, I really do not feel too good about going on and on ...
But as you make SO much effort on a subject I just really like to know more about:

Water should not be able to get into that side of the box

There is a sort of speech barrier here, I think :
Does "should" mean that the box is designed to keep water out no matter what? Or is that mere coincidence?

This comes even closer to my original ponderings:
Did the designers of the box take into account that, even in the first few years of usage, there COULD be a dash of water into one part of the box or the other :?:

as the flow of air "or any water" goes in the top,then to the side chamber "where the drain is" then through the fan and into the car

I am quite sure that I felt some water spraying into the interior at some time, feeling like it was blown in by the fan. Not only in Jimmy, but in other older cars as well. So this must have been taken into account... .

The fan housing prevents water getting into the car.

By design? Or by coincidence? :shock:

The sections below the main top flap are the sealed and boxed in matrix and lower directional vent flaps that the air is blown through.
Only if you get a build up of dirt and then it rusts,will water get into the car via the flaps.

That is what I thought.
That would mean that NO water WHATSOEVER was ment to get into the box (or car, for that matter), right??

Also water will get in if the matrix is leaking.

... we escaped that by mere months, I think...

"Interesting fact"/trivia/nerd/"boring-because-EVERY-Rover-enthousiast-knows-that-you-daft-sod" - stuff:

Working on Jimmy yesterday, I noticed that the diagram of the "heater flap adjustment procedure" in the Repair Operation Manual showed one lever up side down (compared to Jimmys setup and that of the spare box I got), together with a few other differences.

I called Mark at MGBD, as I hoped that he´d have a few (...) cars "standing around" to compare, and Lo and Behold, so was it:
Mark went out and looked into a ´72 and a ´66 car - (DANKE SEHR, Mark!!!) - and next to other alterations on the box, that one lever WAS turned around in the production of the car :shock:
The diagram was not altered accordingly.
(Just to confuse some incapable German with his hands in his hair (...or what is remaining of it) bent over a diagram of the car he just took apart :cry: :evil: ...)

I will call Mark this morning, just to get to know what he came up with searching for that change in the dealer notices and manuals... .

 

[Pilkie]

My brain hurts! :|

Will let Mark Gray continue with this. :?
Maybe he speaks German.

Viel Glück!
Prost!

 

[transexl]

Viel Glück!
Prost!

:!:

 

[mikecoombs]

There are a couple of other possibilities, one being that the box seals are letting water into the ducts. As you no doubt noticed, there is a big hole in the bottom of the box to let the air out into the interior of the car'. if you get water onto the sill in any quantity, say because the covering panel isn't sealing against the window, it will blow down the hole and into the car. The top air entry to the box has been discussed and is largely shielded from water entry by the rear of the bonnet. Living in Australia, I've not a lot of experience of the effect of snow though. The one time I had 450mm of snow on the car, I cleared it all off so I could see out the window and that process cleared the heater box area which is, as said, under the back edge of the bonnet. The box to body seals can be an issue, particularly the bottom one, but note they only let water in when the bonnet is down and the car is moving as the fan blows it out at other times. Leaky heater cores normally produce steam out of the windscreen ducts. Those pesky lever screws can be undone more easily using a 600mm+ extension on a socket from the opposite side of the centre console.

 

[transexl]

:shock:

THANK YOU :!:

Never thought of snow!
Got something to think about now - I got to let this sink in, I´ll be back !!