Help Overheating

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Help Overheating

Postby DeanG » Wed 05.09.2018, 19:55

On the road in Illinois. Car overheating, blowing out coolant. Found and replaced leaking radiator drain plug and heater control valve. Replaced thermostat. Car will go about 2 miles before needle is off scale.

Ideas? I’m a long way from home
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Re: Help Overheating

Postby Giniw » Wed 05.09.2018, 20:12

Is it blowing out coolant around 100°C or well over that temperature? If it's around 100°C maybe the pressure cap needs to be changed? (on the other hand I don't know if coolant boils at 100°C like normal water?)
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Re: Help Overheating

Postby dapinky » Wed 05.09.2018, 20:35

The cap is rated for a temperature of something around 107C I believe (standard cap).

If it is getting very hot, very quickly, I would suspect (if it isn't something simple like a leaking hose/radiator) maybe an issue with the waterpump???
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Re: Help Overheating

Postby John_W » Wed 05.09.2018, 21:30

Did you have to refill the system? Air lock somewhere? The UK cars have a bleed valve under the LHS headlight pod, but I suspect the US cars may not.
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Re: Help Overheating

Postby muley » Wed 05.09.2018, 21:37

..are the fans kicking in?
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Re: Help Overheating

Postby Giniw » Wed 05.09.2018, 21:40

John_W wrote:Did you have to refill the system? Air lock somewhere? The UK cars have a bleed valve under the LHS headlight pod, but I suspect the US cars may not.

European LHD cars do have a bleed valve under the LHS headlight pod too, I don't know whether the FED do.
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Re: Help Overheating

Postby MPx » Wed 05.09.2018, 22:56

Classic signs of coolant not circulating so either thermostat isn't opening or pump isn't pumping. Having changed the stat....the pump has to be prime suspect.
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Re: Help Overheating

Postby Simon_P » Wed 05.09.2018, 23:07

Airlock
or thermostat, did you check it before you put it in?
Other than that
water pump
or
head gasket
In that order

Don't forget to open the heater valve when bleeding the system.

I always do it with the header tank cap off otherwise you create a partial vacuum. If you haven't done this before read up on it as there is potential to scald yourself. Never remove the cap when the engine is hot or partially warm the coolant will suddenly boil when you release the pressure and you will be wearing boiling coolant.

With the system bled (and the cap tight) check the thermostat operation by starting a cold engine and occasionally feeling the top hose it will suddenly get hot when the thermostat opens. Also check the temp gauge if it goes a bit over (say 1/3) the 1/4 (normal) mark and the top hose hasn't got hot switch it off. Let it cool, bleed and start again. If it still doesn't open replace the stat.

To check the pump start the engine, just before it is at normal temperature turn the heater to full hot and the fan on - you should get lots of hot air if not check the operation of the valve (by removing the vac hose) and make sure there isn't an airlock in the heater. You can also check the bottom hose but this has a potential for personal injury if you don't know what you are doing.
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Re: Help Overheating

Postby DeanG » Wed 05.09.2018, 23:39

Thanks for the info. New coolant pump gouing in now
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Re: Help Overheating

Postby alan e » Wed 05.09.2018, 23:47

If you are fitting a new water pump it may be worth fitting a new cam belt at the same time.
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Re: Help Overheating

Postby Brit-Car-Nut » Thu 06.09.2018, 04:17

Simon_P wrote:Don't forget to open the heater valve when bleeding the system.


I was told, the heater valve is in the full on position when there is no vacuum. That creates a fail safe condition in the winter where heat is more important than cooler air in the summer and makes filling the system easier to bleed.

It may be an old wives tale and I never actually checked to confirm. I will look at a new valve in the morning.
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Re: Help Overheating

Postby Giniw » Thu 06.09.2018, 09:02

That would make sense though, as it's not that common to flush the coolant when the engine is running ... :lol: I never thought about that :shock: :-D
(of course there is the vacuum sphere reservoir under the LH wheel arch, but it won't last forever)
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Re: Help Overheating

Postby Rambo » Thu 06.09.2018, 09:20

alan e wrote:If you are fitting a new water pump it may be worth fitting a new cam belt at the same time.


Good idea. And check or change the idlers, tensioners, associated belts whilst you're in the same area
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Re: Help Overheating

Postby Simon_P » Thu 06.09.2018, 14:33

Brit-Car-Nut wrote:I was told, the heater valve is in the full on position when there is no vacuum.


Maybe John. You will need to check. But I'm not sure it makes any difference the heater is above the bleed screw so it would be hard to bleed it without the engine running.
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Re: Help Overheating

Postby dapinky » Thu 06.09.2018, 15:14

The heater valve does 'fail' in the open position (if the failure is due solely to lack of vacuum)....

..... however, if the failure is due to internal corrosion, then it can easily become blocked with bendy bits of crap metal and/or debris.
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Re: Help Overheating

Postby muley » Thu 06.09.2018, 17:17

DeanG wrote:Thanks for the info. New coolant pump gouing in now


Was a faulty pump causing the problem? If so, what went wrong?

BTW there is a classic problem on VW 1.9 TDI engines where the impeller slips on the shaft..


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Re: Help Overheating

Postby DeanG » Mon 10.09.2018, 15:24

After the shop replaced the thermostat, heater control valve (it fell apart), radiator drain plug (it fell apart), water pump, tensioner, turning pulley and belt they decided it was a blown head gasket. No there wasn't much diagnosis going on. They ended up putting a magic elixir into the cooling system. It seemed to stop the overheating. I drove home to Virginia from Illinois babying the car. I only saw boost come on in a few places in the mountains of West Virginian. 850 miles later I was home. Hopefully the elixir didn't cause much damage. The tow home would have been about $1,800.

My stay in Illinois was interesting. Though I spent most of my time at the shop helping the mechanics I did get to see some Amish horse and buggies. There is a nice art gallery in Tuscola Illinois.

I will find a local shop to change the head gasket. I will spend my shop time working on my Seven.
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Re: Help Overheating

Postby Brit-Car-Nut » Mon 10.09.2018, 15:30

Very sorry to hear this. Glad you got home safely.
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Re: Help Overheating

Postby DeanG » Tue 25.09.2018, 21:23

Today I received the news from a shop that I trust. The problem is the head gasket. Book time to replace the head gasket is 22 hours. Parts are on their way. It should be back up and running in a week or two.
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Re: Help Overheating

Postby steve matthews » Wed 26.09.2018, 15:54

:cheers:
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