What causes a slow coolant leak on a Jetta?
This is a fastener-by-fastener description of how I diagnosed and repaired a slow coolant leak as a result of a bad coolant hose flange on a 2001 VW MKIV Jetta Sedan with automatic trans and 2.0L (AEG) engine. This is a known issue with VW engines including the MKIV, and it is the most common cause of a slow coolant leak for this vintage engine.
What kind of air intake system does Volkswagen Jetta have?
Volkswagen Jetta GLS AWP Engine 2002, Powr-Flo® Mass Air Flow Sensor by JET®. JET Powr-Flo Mass Airflow Sensors will increase your engine’s horsepower, low-end torque, and mileage by replacing the restrictive stock MAF sensor which…
Can you use universal coolant on a VW Jetta?
Literature published by VW explains that G12 is not compatible with other coolants, including universal coolant sold elsewhere. They warn that mixing G12 with other coolants might cause engine or seal or sensor damage, and that their warranty may be void if there is evidence of coolant mixing and damage resulting from that.
What happens if you mix G12 with coolant?
They warn that mixing G12 with other coolants might cause engine or seal or sensor damage, and that their warranty may be void if there is evidence of coolant mixing and damage resulting from that. There is another useful description of how this repair is done at the following link done by MikeWire on the VW Vortex forum.
Are there any problems with the Volkswagen Jetta?
Volkswagen Jetta owners have reported 10 problems related to coolant leaking (under the engine and engine cooling category). The most recently reported issues are listed below. Also please check out the statistics and reliability analysis of Volkswagen Jetta based on all problems reported for the Jetta.
What kind of fluid is leaking from the coolant fan?
The contact also stated that the vehicle leaked fluid. The vehicle was taken to the dealer where it was diagnosed that the main coolant fan, engine valve cover gasket, both rear shock and mounts, both front strut mounts, front lower control arm bushing, and both outer tie rods needed to be replaced. The vehicle was not repaired.
Why does my VW MkIV have a slow leak?
This is a known issue with VW engines including the MKIV, and it is the most common cause of a slow coolant leak for this vintage engine. Note that the coolant used in many VW engines is G12, only available through the dealer.
When did the VW Passat coolant leak out?
I took the Passat to the dealership so they could confirm the intercooler coolant leak and provide a repair estimate which was $1460+tax. They gave me the VW Customer Assistance hotline number so I could request assistance with the repair. The Passat was delivered in late August 2013 and has ~71k miles on it.
What kind of coolant does a VW TDI use?
If it were my car I’d find the leak, flush with water, and drive around to clean it out and test. Cheaper than testing with coolant. Then once I fixed the leak I’d flush the water out and refill with VW coolant. You can use generic Febi G12 or Pentosin G12. Technically I think it uses G12++ but it’s compatible with G12.
How does the cooling system work on a VW Jetta?
Your Jetta’s cooling system works by cycling the engine coolant from the engine through the radiator. The water pump pushes the water through the entire system. The thermostat opens up once the engine reaches operating temperature and allows coolant in. If any part of this system fails, your Jetta will eventually overheat.
What causes a Volkswagen Jetta head gasket to blow?
If your Jetta’s engine gets hot enough, the coolant will begin to boil over and manifest itself as steam coming up from under the hood. It does this to relieve the pressure on the cooling system before lasting damage can be done to it. 3. Blown Head Gasket
What causes a car coolant reservoir to leak?
If the reservoir cracks or develops any small leaks it can cause the coolant it is storing to leak or evaporate at a slow rate. The leaks may be small enough that they may not be obvious to the driver, however, over time they will cause the reservoir to empty out.
Can a TDI cooler leak coolant from the intake?
Only gas models. TDI= oil cooled only. The EGR cooler could leak coolant and go back into the intake through the EGR. Remove the intercooler and pressure test it underwater. Only other place coolant sees intake is the EGR cooler.
Is the coolant leaking out of the engine?
If it’s leaking and dripping outside it’s not going into the engine and should be visible. Unfortunately there were no visible signs of coolant leakage. It was from this and another thread that led me to pull the bottom air inlet hose from the intercooler to check for leaks. And that’s where I found it.
How to fix coolant leak in Passat TDI SEL?
See your manual for capacity. Mix 50/50 or 60/40 with distilled water. I have confirmed that my 2013 Passat TDI SEL has a coolant leak in the intercooler. The car has 70k miles on it. Anyone have an idea what a replacement will cost or if I could reasonably expect to get some help from VW on the cost of replacement?
How do you replace a temperature sensor on a Jetta?
Loosen your coolant reservoir cap to release any built up pressure, then tighten the cap back up. By doing this you create a vacuum seal so when you pull out the bad sensor very little to no coolant will leak out while you are making the swap.
What does yellow check engine light on VW mean?
Contact your local authorized Volkswagen dealer for more information. The yellow check engine light code could mean your filter is blocked with soot. See owner’s manual for more information. This error code means your car’s fuel cap is off or missing. Stop!
Where does the coolant come from on a VW?
Coolant flange, radiator, coolant hoses, water pump) If coolant from your VW is leaking from the water pump, the internal bearing and seals are most likely weak, and there will be a trail of coolant from the pump region down towards the engine.If there is steam blowing from the engine, the coolant leak is likely originating from the coolant flange.
Can a VW repair shop fix a VR6 engine?
VW repair shops familiar with VR6 engine problem should be able to help you out with less trial and error. For better or worse, other common problems for VR6s have less to do with true engine repair and more to do with perceived engine repair. That is, the On Board Diagnostics (OBD) of VWs is known for being problematic.
How much does it cost to repair a Volkswagen Jetta?
The average annual repair cost for a Volkswagen is $676, which means it has above average ownership costs. The other factors that contribute to Volkswagen reliability include an average of 0.5 visits to a repair shop per year and a 11% probability of a repair being severe. There are 2496 related questions for Volkswagen Jetta vehicles.
What kind of coolant does a Volkswagen Jetta use?
Volkswagen Jetta 1.9L 2003, Engine Coolant Recovery Tank by Dorman®. Pressurized. Heat and engine vibration can damage plastic overtime causing cracks and leaks. Dorman’s Engine Coolant Recovery Tank uses premium plastic to withstand… Volkswagen Jetta 1.8L / 2.0L 2003, Engine Coolant Radiator by TYC®.
What should I replace the cooling fan on my Jetta?
Volkswagen Jetta 2003, Engine Coolant Radiator by CSF®. Increase the life of your vehicle’s engine by keeping your cooling system in top condition. Replace your faulty engine cooling component with this highly efficient replacement… Volkswagen Jetta 2003, Cooling Fan by Dorman®. Finish: Black. Fan Configuration: Dual. Fan Blade Material: Plastic.
How big is the radiator on a VW Jetta?
Volkswagen Jetta 1.8L / 2.0L 2003, Engine Coolant Radiator by TYC®. Core Size: 25 5/8″ x 16 1/4″ x 15/16″. Row quantity: 1. When you notice that your radiator is leaking, clogged or otherwise damaged, you don’t have to pay the high… Volkswagen Jetta 2003, Engine Coolant Radiator by Replace®.
What happens if you overheat a VW Jetta?
Overheating can cause a lot of expensive damage to the engine. A blow head gasket or a cracked head/block are much more expensive to repair than a thermostat or water pump. Your Jetta’s cooling system works by cycling the engine coolant from the engine through the radiator. The water pump pushes the water through the entire system.
What does a crack in the coolant light mean?
Your coolant light might be signs of a more major engine problem. When you get a crack in the block or the intake gasket you will leak coolant and oil, usually slowly at first. You may not notice the difference at first, thinking that your tank is full. A repair to a cracked engine block or head gasket is an expensive repair.
What happens if you put Pink coolant in a VW?
Only other place coolant sees intake is the EGR cooler. Also, since you already have what looks like clean green coolant in there, don’t mix it with pink VW coolant. It’ll sludge and turn brown. Normally you need a lot of stuff to flush it out so it looks like this has been losing coolant for a while.
Is there a coolant line to a TDI Turbo?
Shows how much the tech knows….there was never any coolant line to any TDI turbo ever. Only gas models. TDI= oil cooled only. The EGR cooler could leak coolant and go back into the intake through the EGR. Remove the intercooler and pressure test it underwater. Only other place coolant sees intake is the EGR cooler.
What kind of engine does a Jetta GLX VR6 have?
Turbo 5-speed Manual) GLS VR6 (2.8L V6 4-speed Automatic) GLS VR6 (2.8L V6 5-speed Manual) GL (2.0L 4-cyl. 4-speed Automatic) GL (2.0L 4-cyl. 5-speed Manual) GLS (2.0L 4-cyl. 4-speed Automatic) GLS (2.0L 4-cyl. 5-speed Manual) GLX VR6 (2.8L V6 4-speed Automatic) GLX VR6 (2.8L V6 5-speed Manual) GLS Wolfsburg Edition 1.8T (1.8L 4-cyl.
What are the specs of a 2001 Volkswagen Jetta?
Select a different Jetta model GL TDI (1.9L 4-cyl. Turbo Diesel 4-speed Automatic) GL TDI (1.9L 4-cyl. Turbo Diesel 5-speed Manual) GLS TDI (1.9L 4-cyl. Turbo Diesel 4-speed Automatic) GLS TDI (1.9L 4-cyl. Turbo Diesel 5-speed Manual) GLS 1.8T (1.8L 4-cyl. Turbo 4-speed Automatic) GLS 1.8T (1.8L 4-cyl.
When to change the coolant system on a VW?
The cooling system is one of the most important areas to pay attention to during water pump, thermostat and timing belt replacement. To ensure that your new VW timing belt components and water pump last until the next 75,000-mile change interval, it’s important to re-create the engine’s condition as it was when it left the factory.
Why does my water pump keep leaking coolant?
Coolant Leak at the Front-Center of your Car The water pump is comprised of multiple gaskets and seals that keep coolant contained and ensure that consistent flow of coolant is delivered from the radiator to the engine. Eventually, these gaskets and seals will wear out, dry up, crack or break entirely.
How can you tell if your car has a bad water pump?
If your car is not circulating enough coolant due to a leaky or malfunctioning water pump, your engine temperature is going to increase, triggering the warning light. 7. Observe if your low coolant light is glowing. This can be an indicator that your coolant reservoir is leaking or that you have a bad water pump.
Where does the coolant go in a water pump?
1. Coolant Leak at the Front-Center of your Car. The water pump is comprised of multiple gaskets and seals that keep coolant contained and ensure that consistent flow of coolant is delivered from the radiator to the engine.