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2004 Jetta 4 1.6 Overheating problem. i noted that the radiator fan did nit switch on. Also noted that the top hose to radiator was warm and botttom hose was "cold". I changed the fan, the heat sensor, and the thermostat,but the engine is slill overheating. How do I test a faulty radiator. Can that be the problem?

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  • 220 Answers

Remove cooling flute and thermostat fit1/3 off radiator cleaner with fresh water top up 1/3 more in and 1/3 two days later drive for 1 week and flush your system fit new thermostat new radiator cup and antifreeze .notes radiator blockage after removing the thermostat is,when engine is hot top hose expand and is hotter then the bottom hose notes when the fans engage.

Posted on Sep 02, 2012

  • otto grobler Sep 02, 2012

    Thanks for the quick responce. Someone else also suggested removing the thermostat. What bothers me is that the engine is not ideling "normal". I hope that I did not damaged the head! I asumeed that was only because of a "old" spark-plug.

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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alicantecoli
  • 22484 Answers

SOURCE: coolant problems 2000 vw jetta

plastic impeller on water pump has come adrift

Posted on Dec 22, 2008

  • 4 Answers

SOURCE: 2004 Jeep wrangler 4.0 - 6cyl overheating

I had the same overheating problem in my jeep ! My problem was finaly found out to be the clutch in my fan its a different kind of clutch system it work as this. When your jeep gets warmer the tighter your fan clutch gets .While cool your fan moves slowly. now to test your clutch just warm up your jeep and rev it up a bit if your fan dose not pick up speed then it is sliping.What will come out of this is that you fan will the seez and run full all the time. if you jeep dose not overheat wile moving then it is not your thermo stat period.

Posted on Oct 14, 2008

MrScary66613
  • 1990 Answers

SOURCE: Overheating Toyota Camry 2004

Check the Tension on your Belt and the Waterpump. I have never Heard of someone Needing to Replace the Entire Motor just for an Overheating Issue unless it has been Driven too far while Hot or Someone Puts Cold Water in a Hot Motor. Check these things first and get a Second Mechanic to check it out Before you Proceed with an Unneccessary Replacement. Please Rate my Response, I need all the Help That I can Get! Thanks!

Posted on Jan 27, 2009

Nomodo4u
  • 863 Answers

SOURCE: Dodge 2002 Grand Caravan V6 3.3 engine overheating/no cabin heat.

Replace the bad radiator hose first.  Second- get you special formulated anti-freeze dye from the auto store and pour it into the radiator.  Third- make sure you got all the air pockets out of your system, cause the coolant system won't work with air pockets in it.  Fourth- Check for leaks by looking for the colored dye.  If it's not the radiator hose, then could possibly be a pin hole in your radiator.  Would suggest replacing all the radiator hoses at the same time while you got the coolant system disconnected, cause you don't want to have to come back and replace another hose in a few months.

Posted on Nov 06, 2009

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Mustgo
  • 2361 Answers

SOURCE: 1991 honda accord is overheating. Installed new

When the car is completely cool,check the electric fan(s) for smooth rotation.

Clean/check/change the thermo sensor,contact and wire.

===

Excavate air pocket in coolant system / check for head gasket leak

This test will kill two birds with one stone.

===

MAKE SURE THE COOLANT SYSTEM and ENGINE IS COLD!

RAN THIS TEST IN A WELL VENTILATED AREA ONLY!

You will spill some coolant during this air pocket purge test.......BE KIND TO THE ENVIRONMENT and ANIMAL please clean up after the test!

===

Put the front end on a pair of ramp or park your car on a VERY STEEP HILL (radiator facing top of the hill) .

Top of the coolant reserve tank

Let it ran for 10-15 minutes.

Monitor for air pockets escaping from coolant reserve tank.

Small amount of bubbles is OK at 1-5 minute mark

After the thermostat open up (after 195 F warm up) at
5-12 minute mark or after high idle you should see less bubbles.

If you do not see any in rush of bubbles then your thermostat may be partially stuck or rusted badly inside the thermostat hosing.

Give the thermostat host few gentle taps.

If you see larger bubbles surfacing after 15 minutes then should do a hydrocarbon (HC) dye test to test for potential head gasket leak.

Let engine cold down and top off coolant reserve tank.

Start monitor for coolant lost

===

A coolant flush is require every 2 years or 24,000 miles.

I recommend the thermostat that has a relief pop-let to reduce the change of burst radiator and coolant hoses.

Make sure you get a new thermostat gasket,black RTV and fresh coolant for the job.

===
Please post more information by clicking the comment link on the top right corner.

DON'T FORGET to RATE ME if my tip is helpful to you!

Posted on Dec 05, 2009

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1 Answer

Not cooling,has new impeller and thermostate


Steve, there's many causes of overheating. You say you have a new water pump and thermostat, so it's obviously not those at fault.

Just a question ... you say your car is not cooling, but is it actually overheating? A faulty temperature sender unit (it screws into the engine block, usually..) can give an incorrect reading on your gauge.

If it is overheating - steam/you can feel the excess heat - is your radiator fan kicking in? Is your car overheating as soon as you drive it? Or overheating when stuck in traffic .. and the fan isn't kicking in..?

Other things that cause overheating which spring to mind include a blocked radiator and/or a collapsed radiator hose.

Hot coolant enters your radiator via the TOP hose and cools as it goes down the radiator, then back into the engine via the bottom hose. Check both top and bottom hose after the engine has warmed - sometimes a hose can become 'flat' and blocked.

Another thing that causes overheating is a burnt head gasket/cylinder head problem.

Switch the engine on and look at your coolant bottle - a continuous 'bubbling' indicates that exhaust gases are finding their way (via a burnt head gasket) into the cooling system.

Any oil in the coolant bottle also indicates cylinder head problems. Also check the oil dipstick. If coolant (because of a defective head gasket/head) has found its way into the oil system the oil on your dipstick may appear a creamy/greyish sludge.

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What is the problem with my 2003 VW Jetta 2.0 overheating?


It may also be the temperature sensor.
Not knowing your model, if it uses both a belt driven and electric fan, the electric fan (or its sensor) may have failed.
Turn on the AC to see if the electric fan will cycle as it should since this is used (in most vehicles) for engine cooling if the main fan isn't adequate whether AC is in use or not.
On high mileage engines if distilled water was not used instead of tap water (along with coolant), the radiator core can eventually become clogged with calcium deposits. .

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are your radiator fans coming on? If not, remove the electrical plug from the drivers side of the radiator and jump the top 2 connectors with a pair of needle nose pliers. the fans should run on slow. If they do, your fans are good. It could either be the heat switch ( you just pulled the electrical plug from it), or the fan relay ( under the coolant reservoir).

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Sounds like you got a bad thermostat.

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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.

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I have a 04 sante fe 2.7l 4 cylinder.The problem is the radiator cooling fansare not coming on,even once the engine has warmed up past the half way mark on the guage.The car has been overheating...


There is a cooling fan switch normally located near the thermostat housing or in the head near the thermostat housing. check this and see if it is defective.

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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

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thermostat replace temp sensor its cheap i hope your water pump is not bad you could mess engine up if you keep on running car and is overheating.

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The most likely cause of this is the fan not kicking on... and the best place to start looking is the fuse for the rad fan (under the dash). If this is good check radiator thermo-switch... Observe the engine as it comes up to operating temp... if the fan does not kick on by about 200 degrees, disconnect the terminals at the switch and connect them together briefly. If the fan comes on then the switch is faulty, if not then suspect the cooling fan relay. If the fan runs normally but vehicle still overheats, the next thing to check is the T-stat. Feel the upper hose when at operating temp... it should be warm... if not remove the T-stat and reassemble... if the problem goes away it was your T-stat, if not it is either a bad pump, or a restricted (clogged) radiator. If the pump is not noisy or weeping coolant, it's probably OK... Hope this helps...;-)

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