displaying posts 1 to 7 of 7

Author Subject: diagnosis needed.
garm

Junior User

Location: Cardiff

Registered: 12 Mar 2010

Posts: 51

Status: Offline

Post #1
My car is overheating, sporadically.
I'd been told last year I had headgasket failure, and left car off road for a year. another mechanic did a "block test" twice and no exhuast fumes were present.
We changed the rad fans and everything seemed ok until last saturday, the second day of having my six back.
Car had been running fine for 2 hours, then got stuck in traffic for a few minutes and temperature when balistic, i mean sky high.

I got it to the garage (who isn't a specialist) and we noticed a ton of rust in the coolant, and no coolant in the coolant!
We've completely bled the system, flushed it out and added some coolant. It seems that the fans only come on at 107 degrees (the passenger side) but the right one doesn't ever.
Have tried turning on air con to force slow speed but nothing happens.

I just took it on quick drive to work and it was fine this morning. Hoever on the way home i had some white smoke out the back.

I got home, left it for an hour, took the cap of and the pinky coolant still wanted to escape out like it was still under fairly high pressure.

I'm unsure what's happening.

Did it first overheat because it ran too hot, i got a pressure lock and then the temperature has flown up, blowing my gasket?

How can you check if the water pump is working or is dead?

I've had such a rough time with this car i am at my wits end....

Background info:
http://www.306gti6.com/forum/showthread.php?id=137015&page=1

Cheers all for any advice...

________________________________________

Troubled Moonstone owner.
Posted 19th May 2011 at 19:27
Rich E Forum Admin

Location: Hertfordshire

Registered: 27 Apr 2005

Posts: 7,757

Status: Offline

Post #2
Okay...

First off, turning the air-con on to bring the fans on only works if the A/C has gas in and works. Given the length of time the car has been standing I would be very surprised in the A/C still works.

Regarding the fans, they should both come on together, either both at low speed or both at high speed. With the ignition on, unplug the brown sensor on the thermostat housing. Both fans should run at low speed for a few seconds and then switch to high speed.

If nothing happens initially and then one fan comes on at high speed (which is what it sounds like it will do) then it's most likely to be a dead fan motor. Put 12v directly to the motors to check them. If they're both okay then the relays in the fan cowling is the next thing to look at.

garm wrote:
I just took it on quick drive to work and it was fine this morning. Hoever on the way home i had some white smoke out the back.

I got home, left it for an hour, took the cap of and the pinky coolant still wanted to escape out like it was still under fairly high pressure.


This, sadly, does sound like head gasket failure. Does the engine run perfectly from cold or does it misfire for a little bit before settling? If so, there is coolant leaking into a cylinder, and this is likely also the cause of the pressurised coolant and the white smoke (which will actually be steam) from the exhaust.

________________________________________

Rich
Posted 19th May 2011 at 20:05
garm

Junior User

Location: Cardiff

Registered: 12 Mar 2010

Posts: 51

Status: Offline

Post #3
Just took the car on a run to town and back 10-15 mins each way with a 2 hour gap inbetween.

No white smoke, didnt misfire when starting at any point ever - a misfire is a bang right? the engine feels a little "shakey" if anything when starting.

Only the one fan came on - a right bugger as i just bought a used set off scambay grrrrr.

No white smoke at all today, but whe i lifted bonnet up can hear somethng near the rad cap - or the radiator cap itself hissing/gurgling like when you shake a bottle of coke and take of the lid slightly. no evidence of leakage though. the radiator cap was also cool to touch, but the big pipe that goes to the rad on the right hand side was hot.

I *really* appreciate your help here; thanks.

________________________________________

Troubled Moonstone owner.
Posted 19th May 2011 at 21:19
pugjim

Seasoned Pro

Location: Sheffield

Registered: 11 Mar 2007

Posts: 1,380

Status: Offline

Post #4
garm wrote:
Just took the car on a run to town and back 10-15 mins each way with a 2 hour gap inbetween.

No white smoke, didnt misfire when starting at any point ever - a misfire is a bang right? the engine feels a little "shakey" if anything when starting.

Only the one fan came on - a right bugger as i just bought a used set off scambay grrrrr.

No white smoke at all today, but whe i lifted bonnet up can hear somethng near the rad cap - or the radiator cap itself hissing/gurgling like when you shake a bottle of coke and take of the lid slightly. no evidence of leakage though. the radiator cap was also cool to touch, but the big pipe that goes to the rad on the right hand side was hot.

I *really* appreciate your help here; thanks.


That shakey feel is a misfire not a bang. From what you have said previous I also think you might have a headgaskt failure.
Posted 19th May 2011 at 22:05
garm

Junior User

Location: Cardiff

Registered: 12 Mar 2010

Posts: 51

Status: Offline

Post #5
So the missfires got worse. had 1 other occasion of white smoke out the back.

Drove to work on saturday and missfire was pretty bad, was like running on 2 cylinders....

Went to start up the car to go home and the car wouldn't start - the starter had been getting weaker and weaker while i'd had the car and just seems to try to turn and stop dead, it doesn't turn over. It's kinda like it's "heaving" like when you go to be sick but nothing comes out after a long night.

I'm towing her home tomorrow and cancelling my insurance 1.5 weeks after getting my car back on the road having spent 600 quid on her...

Here are three questions.
1) what do you think is wrong, why isn't she starting is it related to HG failure?
2) if it's starter motor, how much do these cost? Is it possible for an somebody who is clueless to change a starter motor?
3) What should i do? I've replaced breaks, springs (left and right) new tyres, new battery, new intake, wheel bearing and fans (which were second hand and seem to have broken).

Im wondering if i should try to fix her myself, having no experience or knowledge myself, try to pay somebody or scrap her.

I've owned this car for 1 year 3 months and been able to drive her for 2 months last year, 1 week this year becuase i couldnt afford to fix her headgasket...

my wits have ended.

Cheers,

Pete t.

________________________________________

Troubled Moonstone owner.
Posted 25th May 2011 at 00:49
prism7guy

Seasoned Pro

Location: DoncastAAAAARGH

Registered: 13 Jan 2008

Posts: 4,640

Status: Offline

Post #6
garm wrote:
So the missfires got worse. had 1 other occasion of white smoke out the back.

Drove to work on saturday and missfire was pretty bad, was like running on 2 cylinders....

Went to start up the car to go home and the car wouldn't start - the starter had been getting weaker and weaker while i'd had the car and just seems to try to turn and stop dead, it doesn't turn over. It's kinda like it's "heaving" like when you go to be sick but nothing comes out after a long night.

I'm towing her home tomorrow and cancelling my insurance 1.5 weeks after getting my car back on the road having spent 600 quid on her...

Here are three questions.

1) what do you think is wrong, why isn't she starting is it related to HG failure? - My guess is HG, my old engine was getting coolant into one of the cylinders if i left it for a while, and as such it took bloody ages to turn over, probably because its effectively trying to push all the liquid out and thats not such an easy thing to do.

2) if it's starter motor, how much do these cost? Is it possible for an somebody who is clueless to change a starter motor? - Doubt its the starter, but second hand ones can be had for £10-£20 or so plus postage. Its not massively difficult to change the starter, 3 bolts secure it from memory and a couple of wires. Easy peasy if you remove the inlet manifold but not necessary.

3) What should i do? I've replaced breaks, springs (left and right) new tyres, new battery, new intake, wheel bearing and fans (which were second hand and seem to have broken). - It's your call at the end of the day, you could get the HG replaced with a new cambelt whilst your at it but it may be cheaper to source a known-good engine and stick that one in. That may not be viable if your not so experienced in working on cars though.

Im wondering if i should try to fix her myself, having no experience or knowledge myself, try to pay somebody or scrap her.

I've owned this car for 1 year 3 months and been able to drive her for 2 months last year, 1 week this year becuase i couldnt afford to fix her headgasket...

my wits have ended.

Cheers,

Pete t.

________________________________________

Goldie the track car.
Posted 25th May 2011 at 01:36
garm

Junior User

Location: Cardiff

Registered: 12 Mar 2010

Posts: 51

Status: Offline

Post #7
sry, didnt understand the above post.
Maybe i typed too much? Razz

Just went to tow it home.

Car started absolutely fine, where as it wouldn't for the previous 4 days...wtf?

speachless.

Ragged it home in a swansong before i take for scrapping....

________________________________________

Troubled Moonstone owner.
Posted 26th May 2011 at 01:50

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