Took van in to replace water pump and belts. Found air conditioner bearing was bad, and found a kit to replace it with just a pulley. So it was removed and now I have NO heat in the van, all it blows is cold air....Is there a bypass valve some where ? Or do I need a jumper wire, in the plug for the air conditioner, to complete the curcuit ?

If the squealing is coming from under the hood while the engine in running then it could be a number of things such as an idler bearing, water pump bearing, or possibly an air conditioner or alternator bearing. Other possibilities are belts that are worn or have gotten wed from a bad water pump or have loosened up because of a bad belt tensioner. Take a long bar and touch each area that seems to be making the noise. If you can feel the vibration or hear the squeal when you touch the area, then you found your noise.

Sounds like the idler pulley. It is what keeps tension on the surpentine belt. Usually a water pump will start dripping water through a small hole in pump that opens when the bearings go bad and start to wobble. You can spray some lube on idler pulley to see if it quiets it down some thou this is not a permanent fix. It will pinpoint the problem

Sounds like something with bad bearings. Check in the area of air conditioner compressor or power steering and yes water pump.even the belt tightener will do that.

Replace the crank pulley before it costs you an arm and a leg. It has caused this problem. don-ohio

1. • 1 Park your car overnight and put a large white piece of paper underneith your car. In the morning check the paper. If the paper is wet with liquid, you could have a water pump leak.
     
   • 2 If the paper has green (in most cases) fluid on it, there is a good chance your vehicle is leaking coolant (sometimes refered to as "water"). In many cases, when you are leaking coolant it could be coming from the water pump.
     
   • 3 Turn the engine off and open the hood.
     
   • 4 Locate the water pump pulley. The pulley is the round part that the belt is attached to. To find it, look for the belts. You will see more than one pulley. Your car will have an alternator with a pulley and perhaps an air conditioner, power steering and smog pump pulleys. If you are unsure, ask your mechanic to point out the water pump pulley.
     
   • 5 Grab opposite ends of the round pulley and check for "play" (looseness): Try to rock it back and forth. There should be no give. If there is, the bearings are going and it's time to replace the water pump. By the time you can feel play in the water pump pulley, you may also be able to hear the bad bearing when the engine is running - there may be a low-pitched grinding noise coming from the water pump pulley.
     
   • 6 Visually check the water pump (it's located behind the pulley) for signs of a coolant leak. If the water pump gasket is leaking, it must be replaced. This is a good time to get a new water pump, too, unless it was just recently replaced.
     

what engine? Please rate if this helps. Took a lot of time to dig out.

here's 2002 3.0L 2 valve



Item Part Number Description 1 10346 Generator pulley 2 8678 Belt idler pulley 3 3A733 Power steering pump pulley 4 8620 Drive belt 5 2E884 A/C clutch pulley 6 6B209 Drive belt tensioner pulley 7 6312 Crankshaft pulley 8 8509 Water pump pulley


4 valve



Item Part Number Description 1 3A733 Power steering pump pulley 2 8620 Drive belt 3 2E884 A/C clutch pulley 4 6316 Crankshaft pulley 5 6B209 Drive belt tensioner pulley 6 10344 Generator pulley

water pump 4 valve



Item Part Number Description 1 6A359 Camshaft drive pulley 2 8K543 Drive belt 3 8509 Water pump pulley 4 8W508 Drive belt tensioner pulley

Has it just started with cold weather? Does it squeal at first then as the engine is revved, stop squealing.

If so its probably your alternator belt has worked loose and needs tightening. I'd check this out first, if you've not done it before ask a friend with some know how for guidance. But as a guide, there should be about an inch of give when flexed on the longest run between 2 pulleys, if more then probably needs tightening. If more than a couple of years old, replace with a new one.

If it still squeals after tightening/replacing, you could have a faulty water pump bearing or pulley bearing. Either would require replacement to pre-empt catastrophic failure and resultant engine damage.

1. Step 1 Park your car overnight and put a large white piece of paper underneith your car. In the morning check the paper. If the paper is wet with liquid, you could have a water pump leak.
   
2. Step 2 If the paper has green (in most cases) fluid on it, there is a good chance your vehicle is leaking coolant (sometimes refered to as "water"). In many cases, when you are leaking coolant it could be coming from the water pump.
   
3. Step 3 Turn the engine off and open the hood.
   
4. Step 4 Locate the water pump pulley. The pulley is the round part that the belt is attached to. To find it, look for the belts. You will see more than one pulley. Your car will have an alternator with a pulley and perhaps an air conditioner, power steering and smog pump pulleys. If you are unsure, ask your mechanic to point out the water pump pulley.
   
5. Step 5 Grab opposite ends of the round pulley and check for "play" (looseness): Try to rock it back and forth. There should be no give. If there is, the bearings are going and it's time to replace the water pump. By the time you can feel play in the water pump pulley, you may also be able to hear the bad bearing when the engine is running - there may be a low-pitched grinding noise coming from the water pump pulley.
   
6. Step 6 Visually check the water pump (it's located behind the pulley) for signs of a coolant leak. If the water pump gasket is leaking, it must be replaced. This is a good time to get a new water pump, too, unless it was just recently replaced
   

Something may be out of line in the belt path, an idler pulley that has a bad bearing, or one of the pumps or the alternator is trying to seize-up. Remove the belt and check each pulley that the belt travels over for bearing looseness or rough turning. When the belt is reinstalled, check that the belt seats on each pulley properly. Test it by directing water from a hose while the engine is running--you should only have water thrown off in all directions. Good luck!

1. Remove the Alternator Belt.
2. Remove the Water Pump Pulley
3. Remove the Air Conditioner Belt and Power Steering Belt.
4. Remove the Crankshaft Pulley.
5. Remove the timing belt cover
6. Remove the timing belt tensioner pulley.
7. Remove the Timing Belt.
8. (If Replacing) Remove Idler Pulley.
Installation is reverse of removal. Keep a close eye on the timing marks on the cam sprockets to make sure you don't knock anything out of whack.

I would strongly recommend replacing the water pump while you are replacing the timing belt. (The water pump usually comes in the timing belt kit.) Otherwise you are going to have to do this all over again when your water pump goes out. Good Luck.