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[kluku5]

I need some help please

My car is magically losing coolant somewhere. I got under  the car and saw the engine was wet at back around the clutch, so I thought maybe it's HBV.
But when I did the pressure test, no coolant leaked anywhere, and pressure stayed in the engine, like there was no leak at all. It's still losing coolant.
There is no oil or petrol in the header tank, only clean coolant.
Could this still be the HBV?

Thank you!

[The Red Baron]

I need some help please

My car is magically losing coolant somewhere. I got under  the car and saw the engine was wet at back around the clutch, so I thought maybe it's HBV.
But when I did the pressure test, no coolant leaked anywhere, and pressure stayed in the engine, like there was no leak at all. It's still losing coolant.
There is no oil or petrol in the header tank, only clean coolant.
Could this still be the HBV?

Thank you!

it sometimes only leaks when on/off. 

[cem_devecioglu]

I need some help please

My car is magically losing coolant somewhere. I got under  the car and saw the engine was wet at back around the clutch, so I thought maybe it's HBV.
But when I did the pressure test, no coolant leaked anywhere, and pressure stayed in the engine, like there was no leak at all. It's still losing coolant.
There is no oil or petrol in the header tank, only clean coolant.
Could this still be the HBV?

Thank you!

it sometimes only leaks when on/off. 

yep.. and unfortunately reservoir cap is a sneaky leak area.. stop the car on a silent place( and no one around) and listen to it   (so people wont think you are mad)
 
other candidates
oil cooler area
thermostat
radiator hoses and corners
behind the engine
and finally the oscar goes to head gaskets
 
ps: you can use color dyes to find also

[omega3000]

Coolant bridge seals maybe for second nomination 

[kluku5]

The engine didn't lose any pressure (intake off), can it still be hoses and such? Is there any way to see behind the engine when it's running? It was wet at back, so it must leak from there somewhere. Maybe I should just change the HBV and see if I'm still losing coolant, since that's a common issue? Coolant bridge sits in the V right?

[amba]

Several pipes joining at the rear of the head...coolant bridge and coolant transfer pipe all of which have hose clamp/jubilee which could be leaking .

Other possible area is the coolant transfer pipe to rear of block as has a rubber "0" ring seal all worthy of a thorough investigation.

[feeutfo]

It's possible the hbv only leaks with ac on lo only, or vice versa, as it's has two modes operated via vacuum pipe on the top.

If checking this particular fault, as mine has a load of LPG plumbing in the way, I remove the scuttle to view view the hbv for leaks while the engine is running, allowing you to Play with ac settings and spot any leaks. But it's also possible to check in the same way with the scuttle still fitted on a standard car by reaching round the back to the hbv and feeling for water. It will be hot though.

[kluku5]

Ok then, I will remove the scuttle to check the HBV, and if it doesen't leak I guess I will have to remove the intake to check the hoses at back. I will post again if I find anything during the weekend. Thank You all

[Kevin Wood]

I have also seen coolant leaks that only happen when cold, or indeed, hot, but not both. Might explain why you aren't reproducing the problem. HBV is the most likely culprit, though.

[dbug]

My money is on HBV - you should be able to get your hand down there (drivers side back of plenum) and feel for any wetness.

[cem_devecioglu]

I have also seen coolant leaks that only happen when cold, or indeed, hot, but not both. Might explain why you aren't reproducing the problem. HBV is the most likely culprit, though.

yep.. its the starting point..

[kluku5]

I did reach there when I pressure tested the system, and didn't feel any wetness (ofcourse, because pressure stayed in the engine ). I'll try again with scuttle removed and running engine

Oh, also got a fault code 15 (Coolant Temperature Voltage High). Could it be related to leaking coolant?

[kluku5]

OK, so i removed the wiper scuttle today, and tryed to find some leaks with a running engine. I tryed both HI and LO settings, but i couldn't find anything, felt around the HBV with my hand, but still couldn't find anything wet. So what do you think, should i remove the plenum and intake to check coolant bridge and all that in the "V"?

Starting to think about selling, because of that leak I can't find and I also found that she's leaking oil from valve cover gasket.

[omega3000]

OK, so i removed the wiper scuttle today, and tryed to find some leaks with a running engine. I tryed both HI and LO settings, but i couldn't find anything, felt around the HBV with my hand, but still couldn't find anything wet. So what do you think, should i remove the plenum and intake to check coolant bridge and all that in the "V"?

Starting to think about selling, because of that leak I can't find and I also found that she's leaking oil from valve cover gasket.

Yes remove and check for dampness around bridge seals or furry white water deposits around the area , would replace the seals and bolts while you have it in bits then eliminate ... only pennies and you may need new rocker cover gasket , if so replace and torq down to correct tightness 

[feeutfo]

Cam cover gaskets are common failure sadly. Fit genuine only from a dealer, before the oil damages the ignition system.

If your confident the hbv is not leaking, next step is to remove the plenum, inlet manifold, and plastic wedge so you can see the oil cooler cover plate. Preferably with engine hot.

Then pressurise the system again. examine the v of the engine for leaks, although there will be residue and chrystalised coolent as a give away.


Btw, what year is your 3.0 ? If 98 check core plugs at rear of cylinder head by pot 6 / coil PAC.