Hi all

Quick question, does anyone have any idea why I am losing coolant from the coolant cap. I can't find any coolant leaks anywhere else. Engine temp stays constant with the needle fixed in the middle of the dial. No signs of coolant entering the engine e.g mayo in oil. Coolant expansion tank has been replaced and a new cap fitted but still coolant is escaping, coolant pipes don't seem any more under pressure than normal and heaters in the car work perfectly?

Any ideas would be great!

Matt

hi matt. what number is ontop of your cap? 180 is the TD6 200 V8 [img]http://www.fuelly.com/driver/rob2529/range-rover[img/]
04, 4.4V8, Vogue Oslo Blue with LPG.
"You can sleep in your car, BUT you can't race your house!!!!"

If something can't be fixed with a hammer....... You have yourself an electrical fault!

Hi mate, not sure what's on top but says 140 on the underside of the cap. That's the one supplied by land rover for the part number listed? Only started doing it about 2 weeks ago. Thought the tank had a slight crack so replaced the tank and cap but still does it.

Matt

Ours was losing coolant via the expansion tank bleed screw and I permanently fixed it by using plumber's Teflon PTFE tape, as covered in this link:
http://www.fullfatrr.com/forum/topic21436.html?highlight=ptfe

Mine deffo coming from the cap itself. Before I replaced the old tank and cap with a new one if I listened carefully I could hear a hissing noise from the cap which is what made me think it had some sort of split in the plastic.


Matt

This has been a problem with quite a few cars. Even caps from Duckworths have been supplied at the wrong pressure rating. Do you have your old one?
http://www.fullfatrr.com/forum/topic12183....oolant+cap [img]http://www.fuelly.com/driver/rob2529/range-rover[img/]
04, 4.4V8, Vogue Oslo Blue with LPG.
"You can sleep in your car, BUT you can't race your house!!!!"

If something can't be fixed with a hammer....... You have yourself an electrical fault!

yes my old cap has 140 stamped on it, never had any problems with this tank or cap leaking for the 4 years i have had the car up until now?

Matt

It might be worth trying to carefully wrap some PTFE around the thread of the main cap anyway. It won't do any harm and will easily come oof if unsuccessful. It might even work!

Maybe worth getting a block test or a sniff test done to check this isn't the first symptoms of a head gasket problem 56 TDV8 Vogue SE
9 Freelanders, 2x 2002 TD4ES, 2001 TD4, 2002 1.8GS, 2000 XEDI, 2x 2000 1.8ES, 2004 1.8 & 2000 1.8 GS (rolled)
91 Lotus Carlton (sold)
90 Lotus Elan (BRG)

If it is visibly or audiably coming out of the actual cap then it sounds like the caps pressure regulator is either wrong or broken.

Was it doing this with your old cap or was that simply the bottle leaking?
Have you tried the old cap on the new bottle? There is nothing that can't be fixed with a hammer😜😜
FFRR 4.4 SDV8 Autobiography Santorini Black.
KIA E-Niro 4+
2021 Discovery 5 D300 MHEV commercial

yes i can visually hear and see water escaping from the cap when the engine is up to temp.

I have just been on a road test with my faultmate plugged into monitor the engine.

Took the car down the country lanes where i live which a mix of fast roads, steep slow hills lots of speeding up/slowing down for corners. Gave the car a little bit of a boot to try and raise the engine temp to as high as possible to ensure that the coolant system is pressuring.

Once the engine got up to the operating temp of 105 degrees the radiator temp started to steadily increase with an average engine temp of 104, 105, 106 degrees and radiator ranged from 50-60 degrees depending on my driving style. The engine peeked at 108 degrees when i sat in traffic for a couple of minutes but soon dropped back to 105.

On my return home i left the engine running and checked the coolant pipes they felt normal and certainly not over pressured/bulging although the cap was letting water escape.

Heaters in the car work perfectly and blow very hot on full temp as normal.

Checked the oil again and still no signs of mayo indicating coolant seeping into the oil system.

Matt

northernmonkeyjones wrote:

If it is visibly or audiably coming out of the actual cap then it sounds like the caps pressure regulator is either wrong or broken.

Was it doing this with your old cap or was that simply the bottle leaking?
Have you tried the old cap on the new bottle?

your 140 cap is the wrong one matt,

http://www.fullfatrr.com/forum/topic12183....oolant+cap ... - .- -.




Y. O. L. O.
.

thats what i am thinking, only question i have on going for a higher cap rating is i have been running on a 140 cap for 4 years up until now and the new cap i have got from the land rover dealership is rated at 140 as well.

Im just searching the BMW forums now to see if they have any similar issues and what cap rating they are using.

Matt

Check that the inlet and oulet of the expansion tank aren't blocked.