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Coolant leak on Audi Q7

I HAVE HAD AN INTERNAL COOLANT LEAK ON MY AUDI Q7 ALSO CAR IS JUDDERING WHEN STATIONARY AND IN GEAR. JUST HAD CYLINDER HEAD GASKET REPLACED BUT STILL HAVE SAME PROBLEM. ANY IDEAS ?

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6ya6ya
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Posted on Jan 02, 2017

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  • 34 Answers

SOURCE: can't bleed coolant system on Audi A3!

In my experience with Audis, after any job requiring changing/draining the coolant the car ideally needs to be driven. With the coolant topped up to max drive the car, keep the revs up and shake the car with steering and over bumps where possible. Whatever you do make sure you take at least 2 litres of water/coolant with you, as as soon as the air lock goes, the level drops a lot and quickly. Also keep an eye on the temp gauge and avoid letting it go much over 90 degrees (over 90 on the gauge usually means its well into the hundreds) When you get consistant hot air through the heater, at idle, the level should of settled. If this doesnt work you may have thermostat issues or a blockage. Good luck, let me know how you get on.

Posted on Mar 26, 2009

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SOURCE: Audi A4 2.5 V6 TDI - Creamy grey coolant in expansion tank

Sounds like blown head gasket (or worse) still to me.
Remove oil filler cap and look for grey oil.
Never use water these days but special coolant. Water makes vapour spots and cause block cracks, worse then blown gaskets!!!
vapour does not cool very well.
Look like you have cracks already.
Take a compression test if possible. But might not show op at that temperature.
The gauge indication troubles me.

Posted on Apr 14, 2009

  • 534 Answers

SOURCE: 99 deville head gasket leak?

A head gasket leak is usually indicated (among other things) by continous overheating of the motor, and subsequent loss of coolant.
It can also be indicated by the presence of engine combustion gas bubbles in the coolant resevoir.
Ensure the coolant system has no external leaks, such as faulty hose/s, radiator etc.

Ensure motor tune or other motor mechanical condition is not the cause of overheating.
I assume the motor is actually running hot.

Check cooling fans are operating ok (as necessary when car warms up):- if not check
1) fuse,
2) relay operation,
3) heat sensor switch.

Check/replace the thermostat,
Check the coolant pressure cap is serviceable & of correct rating,
Ensure cooling system is correctly filled, bleed off any airlocks as necessary when re-filling,
Ensure radiator hose on suction side of waterpump is not collapsing at engine revs above idle (due softening),
If the motor has been severely overheated, the head gasket could be blown - look for combustion gas bubbles in the coolant resevoir.

Posted on Sep 21, 2009

Testimonial: "thx..my car is not overheating.only had to pull off road once.it does get to 233 sometime."

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SOURCE: Low coolant light was going on and off...filled

There could be a leak, to find out you must pressure test the cooling system. Also test the cap.

Posted on Sep 28, 2009

  • 1 Answer

SOURCE: Head gasket is damaged. 2005 Nissan Sentra, 1.8

i have a 2005 1.8 nissan sentra.i rplaced the radiator becuause it was leaking.so when i did i took it for a test drive and the needle went to hot then back down to middle ways between the C & H BACK IN FORTH.so i replaced the thermostat. now as far as i can tell it is staying in the middle of C & H. i can't feel no water though cerulating through the top or bottom hose of the radiator. so now that i told you what i done so far my question is???? ( my heater is not working in the car it is blowing out cold air & i left the car runnng for about 45 min. even took it up and down the road.still cold air.what do you think i need to do?????????? )

Posted on Jan 07, 2010

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I noticed brownish oily sludge in my radiator reserviour can. The main oil dipstick appears to be free of water. What should I do?. It's a 2007 Audi q7 4.2 v8 engine.


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2000 audi s8 4.2 oil in water . no water in sump and runs on all cylinders smooth . could it be the oil cooler.


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