Radiator riddle?

[Chaosengineering]

I was under the impression that the reason the radiator caps were different colours was because one was a pressure cap (yellow expansion tank) and one was a standard cap (white radiator only marked).
However my radiator has a steel overflow pipe on the neck and has a white "radiator only" PRESSURE CAP too. So that's a pressure cap on rad and expansion tank?
Can anyone clarify please

[francophile1947]

You have a non-standard radiator fitted. Standard radiator doesn't have an overflow.

[Simon Jones]

Yep, it sounds like it's not an original radiator. If the overflow isn't already blocked up then it needs to be done to prevent any opportunity for coolant to escape, or air to get it.

These are the correct caps and even though the rad one has 1.1 bar on the sticker, that's the working pressure rather than point at which it releases pressure.

[Northern Bongolow]

However my radiator has a steel overflow pipe on the neck and has a white "radiator only" PRESSURE CAP

out of interest what pressure has it got marked on the cap. and is the rad all metal construction.

[Chaosengineering]

Radiator pressure cap has 1.1bar on it along with white sticker and rad use only on. Appears the rad is of brass construction.
If I block the overflow pipe I do have a plain rad cap that would then fit it.

[Simon Jones]

The cap with red and white sticker is the correct one for the Mazda radiator and should not have a spring loaded washer (as the expansion tank cap has). You want non-vented cap on a non-ventable radiator fitting so blocking the pipe should be fine.

[Gasy]

Hi
I new I had got mine crossed over months ago when I did the flush and rusty tee
Just been out and swapped them to correct positions now ( top up rad to neck, don't want to risk a bubble , if you do it )
But my red and white rad cap does have a spring and washer inside

Any way thanks for the post
I new I'd put them on wrong
But didn't realise the difference
Cheers

[rita]

The man from Mazda he say...

Radiator cap KL0115205

Expansion/header/degas tank KL0115205

[Muzorewa]

Isn't the KL0115205 just for the expansion tank - isn't the rad cap a WL0115205 if that's different?

[teenmal]

Hi
I new I had got mine crossed over months ago when I did the flush and rusty tee
Just been out and swapped them to correct positions now ( top up rad to neck, don't want to risk a bubble , if you do it )
But my red and white rad cap does have a spring and washer inside

Any way thanks for the post
I new I'd put them on wrong
But didn't realise the difference
Cheers

Yes you have the correct caps, both caps should be the same,you will find that Mazda/motor factors etc stock them as the same cap for both radiator and expansion tank.

[Simon Jones]

Yes you have the correct caps, both caps should be the same,you will find that Mazda/motor factors etc stock them as the same cap for both radiator and expansion tank.

Mazda have two different part numbers and that is because they are two different parts:


Only the expansion tank cap has the large spring loaded pressure relief valve underneath. They are physically interchangeable but will not work correctly if the wrong way round.

[teenmal]

You will find that Mazda/motor factors etc stock them as the same cap for both radiator and expansion tank.

For example AVA Leisure and The Bongo Fury Shop.

(just a bit of useless information)