Question about 2002 Audi A4

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Overheating a4 hi. my 2.0l 2002audi a4 is overheating. the cylinder head was overhauled including pressure testing and skimming. on idle the vehicle is fine but once you rev or drive it the temperature climbs but goes back down again once you stop and let it idle. i've bled the cooling system and the fans are working. the thermostat had previously been removed completely,but i'd expect that to make it run cold not overheat? i haven't had the radiator checked,i can blow through it with my mouth so i figure its ok? please help..

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  • eruthenburg Jul 06, 2010

    decided to check the water pump and apparently the vehicle had previously overheated so badly that the plastic impeller on the water pump had melted itself off its driveshaft and wasn't turning as a unit with the water pump gear, driven by the timing belt.

    refitted a new unit and problem was solved.



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Install a thermostat, it is vital to prevent over heating and over cooling

Posted on Jul 04, 2010


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Why is my 2001 toyota sienna overheating?

Have a compression test done on each cylinder. Possibly a blown headgasket or cracked head

Oct 27, 2016 | 2001 Toyota Sienna

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Radiator blew out at bottom, engine overheated and now have no compression

You didn't say what your compression readings were. If you do another 2 compression tests and note down the figures..

The first test is a dry test as per normal. Prior to the second test - the 'wet test', spray some some penetrating oil into the cylinder, spin it on the starter to get rid of the excess oil.

The second, wet test, allows oil to get in between the piston and cylinder wall.

If, on the wet test, your compression readings go up significantly this points towards ring/piston damage or excess wear .. a worn engine. This will give you a good indication as to whether it is easier just to fit a second hand engine instead of doing the cylinder head.

If, after doing the wet test your compression readings don't increase by more than 10% compared to the dry test, this suggests that the pistons/cylinders are okay.

Remember that an alloy cylinder head must be skimmed before refitting. Cylinder heads warp because of heat and become 'banana shaped' - raised in the centre. Failure to have the head skimmed is likely to cause head gasket failure very quickly.

If you're going to repair the cylinder head you should change the thermostat as a matter of course. It's good practise, that's all.

Apr 27, 2016 | 2002 Honda Insight

1 Answer

On a 2006 1.3 Rocam. After a broken heater hose, the engine overheated, and I didn't notice until the bakkie lost power. I replaced the head gasket, with no success. The engine still overheated.

Have you checked to see if your fan is working ?
After performing your repairs, did you bleed the coolant system ? One way is to run vehicle with heaters running to make sure that air in the heater core / hoses is bleed.

Jun 17, 2017 | Ford Taurus Cars & Trucks

1 Answer

Change water pump and thermastat and car still overheat what more can i do to fix problem

Hi Zparrot,If your vehicle has overheated it may mean you'll need to have the cylinder head removed. When A vehicle overheats it usually means that the cylinder head becomes distorted and needs to be taken to a machining shop for skimming. Also check to make sure that you do not have any leakages anywhere else from the cooling system. If you need a hand or the help of another mind to continue with the work, drop me a line and we'll tackle it together.regards Johngee10

Jul 23, 2011 | 2004 Chevrolet Venture Passanger

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Gents, i have a colt 2800tdi d/c, blew the head gasket, replaced with new head and water pump, however have noticed now that radiator is building pressure and is now overheating, removed thermostat to...

sounds like your car is air bound when cold fill up water replace cap start car squeeze hose that is highest or closer to the hood remove radiator cap look for bubbles do that for about 10 min. at idle replace cap

Oct 10, 2010 | Mitsubishi Colt Cars & Trucks

2 Answers a4's overheating and seemingly no oil pressure.

well you may have put the gasket back on wrong blocking the oil hole which supplies the oil to the head, this would cause the low oil pressure and the oil light coming on.
If the gasket is on the wrong way it may be causing the overheating problem as well by blocking or partially blocking the water holes in the head that allow the water to get to the head and cool it down.
these are the only things I can think of apart from maybe a cracked block caused by the overheating but that would not explain the lack of oil to the rockers
Hope this helps

Jun 14, 2010 | 2002 Audi A4

1 Answer

Still overheating after head is skimmed

waterpump? No movement of water/coolant, engine overheats. Engine overheats, warp heads. Next time you rip a head off, check gasket to see if head gasket failed or if there is a different cause to car overheating.

May 25, 2010 | 1999 Honda Civic

1 Answer

Runs hot, stall at stop signs, oil residue on back window,

Aerosmith, this sounds like a "blown" head gasket scenario. Does the vehicle idle roughly and if so it could be a compression factor where a blown head gasket is present. Have a look at the oil dipstick - is the oil level correct? - there could be signs of water leaking into the oil system, thus meaning the head gasket is at fault. Overheating - chances are there is damage to the cylinder head - addressed to an engineering shop for skimming & pressure testing.

Good luck

Jul 16, 2009 | 1995 Geo Tracker

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