Question about 1998 Volkswagen Jetta

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Need to get coolant into radiator so car will start no radiator cap only resovoir light came on after i started it now wont turn on think its a sensor found out the cap was cracked

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To start with your Volkswagen might only use G12 coolant and the reservoir is the only way to put it in. Now if the car does not start because of low coolant it doesn't surprise me because Dinamalar the owner of Volkswagen and the other German cars used a lot of worthless and senseless sensors and there is no doubt one on the radiator to shut the car down to keep you from cracking or blowing a head gasket. You have to get the sensor reset . I've worked on a lot of Volkswagens and personally I hate them!

Posted on Nov 24, 2013

  • Ed Snyder
    Ed Snyder Nov 25, 2013

    thanks alot this will help now need to know how to reset i disconnected battery and all that still nothing


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The low coolant sensor will not keep the car from starting. You need to fill the reservoir. Look on the side of the head by the transmission and you will probably find the coolant flange on the side of the head is leaking. It usually leaks slow enough that the fluid dries on the engine or sits on the transmission. If it is leaking there you'll need to replace the flange and gasket, and any "o" rings for sensors that go in it.

Posted on May 28, 2014


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Posted on Jan 02, 2017

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SOURCE: 1999 VW beetle over heats...a LOT

Sometimes, if the leak is small, when car is running and engine hot, you do not get dripping under the car because water is getting vapourized, before dripping down.

Check water level, if water level is going down, then there is either another leak, or the head gasket is going.

When head gasket starts to go , water is vapourized into the engine.

If car overheated after the radiator problem, it is not uncommon that this may had damaged the head gasket, go back to the dealer and complain, as after replacing radiator, the car should had been inspected properly for additional problems.

Posted on Nov 05, 2008

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SOURCE: how do i fix the Coolant Level (ECL) Sensor

Figuring the car is not overheating because it does it even with the engine cold sounds like a defective level sensor. Like on most VW's inside the reservoir bowl the level sensor is located. First make sure the level of coolant is filled to the maximum line while the vehicle is cold. (not run for a few hours) If that's ok check the density of your coolant. Requires a coolant tester that you can pick up at any automotive store. It should be between -36 and -45 degrees C. (A good mix of coolan and water) Also make sure you use the right coolant. In 98 it should be pinkish red. And get it from the dealer. Do NOT MIX coolants as it could destroy the system. If it is unplug the connector at the level sensor on the bowl and make sure the terminals are not corroded. If they are not before starting he car jump the 2 terminals with a paper clip or wire to fool the cluster into thinking the coolant is full. Be careful not to damage the terminals or spread them. Start the car, the flashing light should not come on. If it doesn't your problem is the level sensor in the bowl. You'll have to replace the bowl to replace the sensor. They're one piece. Not very expensive. You can usually save the coolant in the bowl and reuse it if it's ok by blocking the bottom hose and putting your finger to save what's in the bowl.

Posted on Nov 26, 2008

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SOURCE: how do i fix the Coolant Level (ECL) Sensor

start the car and add coolant tothe max level and see if that takes care of the problem. when my blinks it tell me when collant is low

Posted on Apr 05, 2009

  • 8 Answers

SOURCE: overheating problem

looks like you have done everything but the problem with your car is that the cylider head gasket has gone have a look at the dipstick or remove the oil filler cap if it looks like mayo then 100% head gasket has failed you said no water on the floor so it must have gone into engine only way this can happen is head gasket failing, if you have put lot of water in to the cooling system then your sump will be full of oil water mix.

let us know your findings so we can help you more if you need it

Posted on Apr 22, 2009

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SOURCE: i have a 1997 volkswagen jetta 2.0 GL. I just

if you added back the fluid you lost it e=will run out becuse thermostat aint o pen yet try again let motor warm up then cgk fluid

Posted on Oct 09, 2009

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1 Answer

How do you open the moist cap? i want yo fill it with water but it wont open

What is this cap on?? Radiator or windshield washer reservoir? Something else?

If the radiator, most newer cars have a plastic bottle or tank that has a "cold" and "hot" level indicated. You should be able to see the coolant level thru the tank. You should NOT need to open the radiator cap if your car has this tank. Add a 50/50 mixture of water and coolant (of a type your car requires) up to the "cold" mark and start the car. Let it run with the heater set to HOT and fan set to HIGH. Continue adding the 50/50 mixture to maintain the coolant level to the HOT level mark on the tank as needed with the engine running. Stop when there is HOT air blowing out of the heater.

If your car does NOT have this tank, you may only open the radiator directly when the engine is COLD. Wait several hours for the engine to cool after shutting off before attempting to remove the cap.

When cold, press DOWN on the cap WHILE turning. Most caps will come off after a 1/4 to a 1/2 turn. Start the engine and set heater HOT and fan to HIGH. Continue to add a 50/50 mixture of coolant to the radiator until the heater blows HOT air. The coolant level in the radiator should be just under (1" or less) from the bottom of the radiator opening.

Was this the info you're looking for?

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Water keeps coming out of my resavor when it starts to heat up

from what you describe either a bad radiator cap, or a leak in the small hose going to the resovoir,or the line within the resovoir tank is to short or missing,this is whats happening,engine warms up to a point that the cooling system is building pressure,the radiator cap has a set presure release to it you might see the figure direcly on top of the radiator cap, 12-14 lbs rated. it usualy will read something like that, so as that warming engine builds pressure in the cooling system it will eventualy surpass the rating of the radiator cap ,and out it goes and flows in that small line to the overflow resovoir. now when the engine cools back down it now will create a vaccum and should draw that water back from the resovoir to the radiator,but if the hose or hardline that is usualy integral within the resovoir is bad cracked or missing, it would be the same as trying to drink a soda through a straw,but the straw is not inserted below the surface of liquid.or if the straw was cracked, no fluid can be vaccumed up through the straw, the resovoir works on that same principle, it must have a good unobstructed line from radiator to the resovoir,and the line inside the resovoir should go nearly to the bottom of the tank, so the water can be vaccume syphoned out just as drinking a soda with a check to be sure the line is all good no obstructions,no cracks, and that there is a line that continues within the resovoir tank almost to the bottom as well and it is in good shape as well. last check that radiator cap to make sure the rubber as well the upper gasket portion are still there and not cracked/dryrotted. if all that is in good working order then your radiator should be able to recover the water back.just like sippin a soda through a good straw

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The radiator keeps throwing out all the water from the resovoir, why? everytime i put water or the cooler fluid and i use da car and turn it off all the water leaks out through the resovoir.

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Just bought my 2008 Chevy Impala and I love it except when I use the remote start or just start normal, it does not heat up unless I am driving down the road. It blows cold air until i drive. Is this...

You may be low on coolant - or have an air bubble in the heater core! Make sure you have the right antifreeze and mix 50/50 with water. Start car, turn heater on max heat full blast and fill reservoir with coolant. If you have access to the radiator cap I would fill from there. This is a pressurized system, so it may blow some coolant out at you. Squeeze upper radiator hose to ensure it is full, cap radiator and now recheck the reservoir. If this doesn't help, you'll need to raise the front of the vehicle so the radiator cap is above the heater core hoses. Remove cap, start engine with heater and blower on high and fill radiator. Cap radiator before you lower the car and you should be good. Keep an eye on the coolant reservoir as you may have a leak which would cause the low coolant symptom. You also have a sensor to tell you is you are low on coolant. If you are and it is not lighting up, you may want to have it ( the sensor) tested and replaced.
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1 Answer

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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

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