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Audi A4 Cooling Hose Flange

Proper Diagnosis of Audi A4 Cooling Hose Flange Problems

When it comes to a car's cooling system, there is only one mortal enemy that poses the greatest danger to a lot of car components-coolant leaks. Because coolant replacement is not an exact science, you should be conscious of how much of this substance you pour into the overflow tank and how frequently you do it. It is always a good practice to observe any abnormalities in these values. If you notice that you have to put coolant regularly in the tank or notice any other symptom that may be tied to losing a lot of coolant, check for a coolant leak caused by a damaged cooling hose flange. If you're at a loss on how to do that, here are some tips on how to diagnose problems caused by a failing Audi A4 cooling hose flange and how to fix it:

Excessive coolant needed in the overflow tank

Having to put coolant in the overflow tank regularly-about once every two weeks-is a sign that something is wrong. This is most especially true when you are driving in cold weather. If this is the case, check for coolant leaking from the cooling hose flange onto the ground where you normally park your car. In some cases, you will not find the substance on the ground as it may be caught by your engine components. Your car is in a worse situation if coolant falls on other car parts, as it may damage these components and cause them to stop working. Inspecting damage and replacing your cooling hose flange will solve the problem. Check for damage in the O-ring seal as well and replace if necessary.

A greenish substance formed around the cooling hose flange

Your cooling hose flange might be made of plastic, and a plastic cooling flange that is exposed to high heat and pressure will eventually warp. It may develop cracks and will eventually fail. A plastic flange will normally fail after a few years, but its service life might be cut short by leaking coolant. Look for a greenish substance that looks like dried coolant around the flange on the transmission side or on its backside. It usually means your cooling hose flange has given up on you, and you will have to replace it with a new one.

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  • Proper Diagnosis of Audi A4 Cooling Hose Flange Problems 27 February 2013

    You're driving home one day after dark, and you park your car in your garage. You bump into your parked car and notice that the hood is hotter than normal-it's wintertime and you find this odd. You ignore it and go to bed, but the next day you notice liquid on the ground seeping from underneath your hood. You inspect the hood and find some more of the same substance around your Audi A4 cooling hose flange. You suddenly realize that you have not been taking care of your cooling system, and now your cooling hose flange has given up on you. Fortunately, we have put together a few important maintenance tips that'll keep your flange going for a long time.


    Detach the cooling hose flange properly during a check-up.


    When disassembled improperly, the O-ring seal that is attached to the flange might fall out of place. You may not notice that it's gone and put the flange back on without the seal. Be careful not to lose the seal-it comes in between the cooling hose flange and the coolant hose and prevents coolant from leaking to the other parts of the engine. When disassembling the flange, remove the hoses that are accessible first. Only then can you detach the bracket nut and a few bolts that keep the flange in place. Pull the bottom hoses out next, and proceed to clean the flange itself.


    Clean the flange regularly.


    Apply a degreaser to the flange to start cleaning it. Use fine sandpaper to smooth out the surface. Do this regularly to prevent the flange from being damaged, as deterioration can cause dangerous coolant leaks.


    Reassemble the flange properly and apply liquid gasket to it.


    After cleaning, you'll need to reassemble the flange. Apply some liquid gasket to the O-ring seal to give it a tight seal. This ensures that the seal doesn't move out of place-a surefire way to make sure coolant doesn't leak. When putting everything back together, make sure you don't over-tighten the bolts because the head might snap right off. Use a wrench to carefully tighten the bolts until the coolant flange has a snug fit.