At Fixya.com, our trusted experts are meticulously vetted and possess extensive experience in their respective fields. Backed by a community of knowledgeable professionals, our platform ensures that the solutions provided are thoroughly researched and validated.
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
Also get your friend to flush the system if it hasn't been done in awhile . I regularly get older rigs in that have issues with their breaks and cooling systems. Both need to be flushed every ten years min. Or you'll end up with failing systems.
Impeller in the water pump worn resulting in decreased pump rate. Replace water pump. Also check the radiator tubes. They may be partially plugged and need to be rodded out. Radiator may look good, no leaks, but if passages are plugged it wont cool properly.
Pressure is not a good indicator of water pump operation. Pressure in the cooling system comes from the heating of the water and its expansion. Jettas come from the factory with plastic impellers on their water pumps. These have a tendency to break and fail, causing overheating issues. Most aftermarket pumps have metal impellers to prevent this from happening. I would seriously consider having the water pump replaced, especially if it is original and you have more than say 60K miles on the car. It's due for a change anyway and may save you your engine. See what this guy had to say about his Jetta.....
submersible pumps need clearance between the impellers to function . They can become jammed from sand/gravel getting into the pump or the impellers wearing out from pumping sand in the water. Pull the pump and have it checked out by an accredited pump specialist.
Check that there is water in the hole for the pump to run in
The water pump is driven off of the timing belt. Might as well do T-belt and access. while you are in there.
Oh, and make sure the replacement pump has a metal (brass) impeller. The factory pump has a metl shaft w/a plastic impeller. Once in a while these cause somebody a headache when the impeller seperates
No, but it could be the impeller inside the water pump, has come loose from the impeller shaft.
A leaking seal indicates that the bearing, or bearings, for the impeller shaft are bad.
I have replaced water pumps, (With a brand new one), and have had to remove it, and reinstall with another one. Why? Impeller is spinning around on the impeller shaft. The machining done was a bad job, and the impeller wasn't staked to the impeller shaft.
check for water flow in the radiator. if the hoses dont expand when you rev the engine, the water pump is probably bad. alot of the factory water pumps have a plastic impeller on them, and the impeller will break in pieces inside the pump housing. if you take the hose off the pump you can see the impeller. napa sells a new one with a aluminum impeller and its a new one, not rebuilt.
×