Print Page - Over heating 12A

Title: Over heating 12A
Post by: Christopher on July 21, 2006, 01:37:26 PM

Could you help.

My 12a engine is over heating. Even on the motaway.
I was told take the coolant cap off and run the car and if i see fizzing my water seal has gone and that means Rebuild.

Results

on idle

(http://i5.photobucket.com/albums/y185/chrismvts/stuff/DSC00487.jpg)

2500-3000rpm

(http://i5.photobucket.com/albums/y185/chrismvts/stuff/DSC00488.jpg)

(http://i5.photobucket.com/albums/y185/chrismvts/stuff/DSC00489.jpg)

(http://i5.photobucket.com/albums/y185/chrismvts/stuff/DSC00490.jpg)

Then let off from 2500-3000rpm

(http://i5.photobucket.com/albums/y185/chrismvts/stuff/DSC00491.jpg)

Any coments

thanxs

Pete.

Title: Over heating 12A
Post by: antnicuk on July 21, 2006, 02:15:50 PM

were the bubbles there when you took the cap off without the engine running?

do new bubble keep coming up while engine is running or does it stay the same?

Let me know how you get on pete

Title: Over heating 12A
Post by: Christopher on July 21, 2006, 04:01:40 PM

were the bubbles there when you took the cap off without the engine running?

No

do new bubble keep coming up while engine is running or does it stay the same?

yes

Maybe a vid might help

Pete.

Title: Over heating 12A
Post by: shaunwil on July 21, 2006, 05:00:05 PM

Have you recently refilled the coolant system ?? Maybe you have an airlock. You could try and flush the system with a hose and run some fresh water through the system.

Hope it isn\'t rebuild time !

Shaun

Title: Over heating 12A
Post by: Christopher on July 21, 2006, 05:20:11 PM

Done that mate a few times now.

Hopefully this vid might be better. The temp gauge was over half way when filmed.

http://video.google.co.uk/videoplay?docid=-6298017253777964815

Pete.

Title: Over heating 12A
Post by: antnicuk on July 21, 2006, 05:32:17 PM

this is a 12a, they are lot more simple than an FD, you dont really get air locks, the set up is so simple, the rad is upright, there is no cooling or heating of the throttle body or turbo and no AST.

Title: Over heating 12A
Post by: antnicuk on July 21, 2006, 05:34:26 PM

I cant watch the vid, i am work, but you really need to try it when the car is completely cold as they may be boiling bubbles as opposed to gasses from the engine.

Title: Over heating 12A
Post by: oldone on July 21, 2006, 06:10:43 PM

Have you checked you exhaust...if there is water or excess vapour coming out.if not I would guess your theromstat or water pump is playing up or blocked passages............:Typing Diff to speculate on this one without being there....:Talking1

Title: Over heating 12A
Post by: Christopher on July 21, 2006, 06:26:38 PM

Yes there is water vapour in my exhaust :mad: and I have replaced my theromstat a week ago and my fan 2 years ago.

Pete.

Title: Over heating 12A
Post by: oldone on July 21, 2006, 06:32:16 PM

Sorry to tell you bud.:( .......pull the motor and replace the seals..:eek

Title: Over heating 12A
Post by: antnicuk on July 21, 2006, 06:55:37 PM

unfortunately age does as much damage to a rotary as mileage, even though its really low mileage, those seals are 20 years old or more.

Mazda Rotary Club

General => General Technical => Topic started by: Christopher on July 21, 2006, 01:37:26 PM