Question about 1999 Volkswagen Cabrio

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My cabrio is over heating the coolant line at top of radiator is hot line from bottom of radiator is cold a mechanic said it was the aux fan motor could be

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Sounds like a faulty thermostat, once though I had a VW with the fins missing on the water pump impeller, replace the thermostat first as it is 11 years old and they age and are inexpensive.

Posted on Apr 29, 2010

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Blower motor runs but heater doesnt work


Hi Marina,

This sounds like a low coolant (anti-freeze) level related problem.

After the car has been sitting for hours and the engine is COLD (over night is ideal), check the coolant reservoir of the car. Fill the reservoir with a 50 / 50 mixture of coolant (a type approved for use in your car) and water to the COLD line.

Remove the radiator cap - again - the engine MUST be COLD. The coolant should be visible about 1 - 2 inches in the radiator filler neck. Top off the radiator with a 50 / 50 coolant and water mixture as needed to get to the 1 - 2 inch level described above.

Leave the cap OFF and start the engine.

Turn the heat to HOT and fan on.

You should begin to see the coolant in the radiator begin flowing as the engine warms up. If at any time the coolant level in the radiator drops, add additional 50 / 50 coolant and water mixture as needed to get to the 1 - 2 inch level described above previously.

As the engine warms, the coolant will expand slightly and may begin to overflow from the radiator filler neck. At this point, replace the radiator cap SECURELY. If you needed to add coolant at any time in these steps you should have heat now. If not, try driving the car until the car engine reaches normal operating temperature.

If you're still unable to get heat, there may be a clog in the heater core or hoses that supply it; air trapped in the heater core circuit or other issue that will need a mechanic to repair.

Regardless if you have heat or not: Check for puddles of coolant under the car. You may have an inexpensive repair to fix a leaking hose or fitting. After the engine is hot check the exhaust pipe for white wispy "smoke". When first starting, this is common - but after hot - the exhaust should be clear. Wispy "smoke" is really steam from coolant leaking into the combustion chamber. This could be the cause for your coolant loss. This also indicates a much more expensive repair problem or either a damaged head gasket $$ or cracked engine block $$$$.

Good luck!

Feb 02, 2016 | Cars & Trucks

2 Answers

Where do I start to look at when engine overheats when air conditioner is on


The A/C causes the engine to work harder (that's why fuel economy suffers when it is run).

If your car has an electric fan - make sure it runs when the engine is hot. If it does not - you may have trouble w/o the A/C running if is gets warmer outside. Look for fail fuses, disconnected plugs, etc.

You may also have flaky thermostat that is not opening fully when needed to exchange hot water in the engine block with cooler water in the radiator.

First, check the coolant level. You should find a semi-transparent reservoir / tank located under the hood that has a cap marked "Coolant". The side of the tank should have two indicator lines - one for HOT and one for COLD. If the engine has been run up to normal temperature (so that it can provide heat in the car), you should see the coolant level at or slightly above the HOT line. If the engine is cold - first thing in the morning or after sitting for several hours - the coolant should be at or slightly above the COLD line. View these levels while the engine is off and the car is parked on a flat, level surface. If there is not enough coolant - you will need to add the CORRECT type for your car.

Hot Engine
(1) With the engine hot, add enough coolant to the tank to bring the level to the HOT line. You may have to check the tank several times after driving if the coolant level in the radiator is down a great deal. NEVER open the radiator cap when the engine is warm or hot!

or:
Cold Engine
(2) With the engine cold, add enough coolant to the tank to bring the level to reach COLD line. Additionally - with the engine cold - you can add coolant directly to the radiator by removing the cap. Start the engine, set heat in car to HOT and add coolant mixture to radiator until level comes up to the bottom of the filler neck. Once the engine is HOT (getting heat in the car) check and top off radiator as needed and put cap back on radiator.

Check the levels in the TANK several times over the next few days when cold. If the tank ever empties -you'll need to have this looked at by a mechanic.

Apr 09, 2015 | 2009 Dodge Journey

1 Answer

Hell is hot and my car is too.........


If your bottom hose is ice cold, or room temp after the engine has already warmed up, the radiator is plugged. BOTTOM LINE. you may have to replace radiator. or uplug it ! your t-stat should be just fine. unless you think its full of ****.

May 08, 2012 | Cars & Trucks

1 Answer

Overheating


CAR OVERHEATING FIRST CHECK FOR LOW COOLANT IN THE RADIATOR COOLANT OVERFLOW JUG.IF COOLANT LEVEL IN OVERFLOW JUG LOW REFILL ADD COOLANT BACK TO THE FULL COLD MARK.PUT RADAITOR CAP ON COOLANT OVERFLOW JUG START ENGINE LET IT IDLE UNTIL IT OPERATING TEMPERATURE.MAKE SURE TOP RADIATOR HOSE GETTING HOT WHILE ENGINE WARM UP.IF TOP RADIATOR HOSE DONT GET HOT WHILE ENGINE IDLING YOUR THERMOSTAT COULD BE STUCK CLOSE CAUSING CAR TO OVERHEAT.IF TOP HOSE IS GETTING HOT.CHECK FOR COOLANT LEAKS CHECK TOP RADIATOR HOSE AND BOTTOM RADIATOR HOSE FOR LEAKS.CHECK FOR LEAKS AT THE RADIATOR CORES AND PLASTIC SIDE CONTAINERS.IF ALL IS GOOD ENGINE OVERHEATING WHILE IN A LONG TRAFFIC LINE, COOLANT FANS NOT COMING ON.COULD HAVE FAULTY ENGINE COOLANT TEMPERATURE SENSOR OR BLOWN COOLING FAN FUSE OR RELAY.COULD HAVE PCM FAULT.MAKE COOLING FAN ELECTRICAL CONNECTORS AND WIRING NOT DAMAGE OR BROKEN.

Jul 17, 2011 | 1999 Oldsmobile Alero

3 Answers

My radiator fan is not working and I cannot find any of the relay fuses I have seen in other cars for this type of problem.


Follow the wiring back from the fan motor, the relay is often found at about the height of the bottom of the radiator on the inner fender. Check that connection is clean and free of corrosion. Check that the fan works by taking two trailing wires directly from the bettery terminals and connecting then to the fan motor directly. Use a voltmeter and check the voltage at the relay when engine is cold and shortly after the radiator top hose from the engine becomes hot (the coolant sensor should have signalled for the fan to switch on at this time). No voltage indicates a break in the circuit or faulty sensor. Voltage but no fan indicates faulty relay

Apr 03, 2011 | 1994 Pontiac Sunbird

1 Answer

Car overheated and lost all power. how do I get it to start?


ENGINE NOT GOING TO START IF GET TOO HOT FIRST THING I WOULD REPLACE THERMOSTAT AND RADIATOR PRESSURE CAP THEN ADD COOLANT UNTIL COOLANT LEVEL CORRECT THATS WHEN THERMOSTAT OPEN UP AND TOP HOSE HOT.CHECK FOR LEAKING RADIATOR HOSES CHECK TOP RADIATOR HOSE CHECK BOTTOM RADIATOR HOSE.CHECK FOR LEAKS AROUND THE RADIATOR LOOK DOWN BELOW COOLANTS FANS CHECK FOR LEAKS AT RADIATOR CORES OR LEAKS AT THE RADIATOR PLASTIC SIDE CONTAINERS. CHECK FOR LEAKS AT WATER PUMP WEEP HOLE AND CHECK FOR LEAKS AT THE HEATER HOSES AROUND ENGINE BLOCK TO THE HEATER CORE HOSES. THERE IS A REASON CAR OVERHEAT.IF CAR OVERHEAT WHILE DRIVING YOU HAVE FAULTY THERMOSTAT OR LEAKING OUT COOLANT OR BLOWN HEAD GASKET.IF ENGINE OVER HEAT WHILE SITTING DURING A LONG IDLING PERIOD.YOU COULD HAVE FAULTY COOLANT TEMPERATURE SENSOR OR FAULTY COOLING FAN FUSE OR RELAY.HOT WIRE COOLANT TO SEE IF IT RUNS IF NO REPLACE FAN MOTOR. IF YES FAN MOTOR COULD HAVE FAULTY WIRE OR PCM FAILURE. CHECK ENGINE CRANKCASE IF OIL LOOKS LIKE MILK SHAKE ENGINE HEAD GASKET LEAKING.

Nov 26, 2010 | 2002 Mitsubishi Galant

2 Answers

V6 camry engine overheating what are possible causes


Make sure the reservoir coolant tank is at 'full'. Start the car from cold and observe. After a couple of minutes when the engine has begun to drop in revs ( the coolant temperature sensor should tell the ECU to begin to shorten the injection cycle as the engine warms) the top of the engine and the coolant passage to the thermostat housing should become warm to the touch. When hot the top rubber hose to the radiator should become warm and then hot as coolant begins to circulate. If the top hose fails to get hot at any time then the thermostat is at fault. If you have electrically driven radiator fans these should now come on. If they fail to come an at all you need to check the coolant temperature sensor, the electrical motor fuses and the motor relay. Lastly check the motor itself (just run a 12v supply to it directly). As the ar continues to idle, with the fans running, the bottom return hose from the radiator to engine should also become warm. If the bottom hose fails to become warm this points to circulation problems. Either the radiator had become clogged with rust sludge and needs an extensive flushing out with a high pressure hose or the pump is not functioning as it should. Quickly check that the interior heater works by asking for 'full heat with fan on full'. If the interior heater works this indicates that the main coolant pump is probably OK. To check the thermostat more thoroughly, remove it from the car and drop it in a pan of near boiling water; the 'stat should pop open. As the pan cools, at 88 degree centigrade or so, the 'stat should pop closed. Failure to observe this tells you the 'stat is a dead and needs to be renewed.

Sep 02, 2010 | 1999 Toyota Camry

1 Answer

Replaced thermostat and flushed out heater core 3 times 3 times it was cloggged, flushed system twice got good radiator flow and ther very hot just heat like luke warm one line in to core hot one oming out...


If the heater core is not damaged or leaking ie: if you don't see coolant on the INSIDE of your windshield or coolant on the floor inside the car then chances are you may just need to BLEED the radiator.

remove radiator cap

Fill coolant resovoir to the cold line if the engine is cold from sitting overnight.

Start engine with cap off

Wait till engine gets hot

While waiting you will see a big gurgle of air bubbles come out and the coolant level will drop

Fill the radiator with more coolant to compensate.

When the fans come on and it stops gurgling air install the radiator cap

You are done

Watch the coolant level for the next few days and top off in the resovoir as needed to keep it filled.

Your heat should be very hot now providing you installed the correct oem thermostat correctly.

Hope this helps

Mar 31, 2010 | 2001 Kia Spectra

1 Answer

Radiator want stay full of water or antifreeze has plastic jug on fender weld


Is there a leak somewhere? There should be green or pink fluid on the ground if there is. The plastic jug is often called the overflow this has level marks on the side of it for when the vehicle is hot and cold, cold is at the bottom end of the jug. The purpose of these marks is so you can see the levels without having to open the radiator. When the engine is cold open the radiator, start the motor and look into the radiator there should be coolant at the top of the opening. If not add coolant while engine is running, note if it's pink it's the DEX/Cool, if green any over the counter coolant will do. Add until the level hits the top of the opening. Let the engine heat up and check the level again. If it's full put cap back on and note the level in the overflow jug. If engine is hot level should be at the top mark, be sure to NOT fill the jug to the very top as it needs the space to expand for any over flow from the radiator.
The system will pull extra coolant from the jug when it's cold and use it until the proper temperature is reached then it will "spit" the extra back into the jug. (that's why there are two lines 'hot' and 'cold') Never add water to the jug as it will cause the jug to crack if the outside temperature goes below freezing always add coolant/antifreeze.

Oct 10, 2009 | 2002 Chevrolet Cavalier Coupe

2 Answers

My VW Cabrio is overheating after 1-2 miles. Coolant in recovery tank is boiling by this time and making bubbling noises. Someone changed radiator hoses, flange, some housing. They are saying that radiator...



Run the engine and look at the header tank , is there lots of air bubbles coming back out of the water if is then the head gasket may have split and that is down to either a can of Radweld or a strip down repair

If the radiator is not uniformly hot them I would go for that as your problem

Normal operation is that the engine starts the thermostat is closed , engine block heats up and opens water starts to circulate around the block

So to check that you need to fill the radiator with cold water run it for a few minutes check the bottom hose it should be cold

The stat opens and the bottom hose should get hot as the water from the block is pumped into the radiator for cooling.

The radiator should get hot all over and the cooling fan should kick in when the sensor hits the over limit stop.

If that does not happen then get someone to remove the stat altogether (It is only there to get the engine block warm quickly in cold regions )

In which case the bottom hose should go from cold to warm to hot

Jun 23, 2009 | 1997 Volkswagen Jetta

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