I have a coolant leak behind the serpentene belt it's not the water pump it's coming from the opasite side of the engine, it is a 3.3 v6

You don't say what make and model you have, but on many engines now, the water pump is behind the timing cover which is the same cover behind the serpentine pulleys. So it is probable your water pump is leaking in there, and coolant escaping from behind the cover. It is not usually economic to overhaul the pump itself.

If your engine has a timing belt, I'd advise changing that too as it has to come off.

All three of these engines a timing belt driven which means the water pump is also timing belt driven. The water pump is located behind the timing belt covers on the front of all three engines. The timing belt has to be removed in order to service the water pump. Yes coolant can leak out the pump when it is bad.

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You didn't mention the model, year and engine. If this is a V6 or V8 then suspect a leaking intake manifold gasket.

Removing and changing the water pump on a 2000 Grand Caravan should only be done if your van has a 3.3 liter or 3.8 liter V6 engine. On any other engine types, including four-cylinder engines, you must remove the timing belt from the engine to access the water pump, which is a dangerous task that can mess up the engine if attempted by an amateur.
The procedure is as follows:------------- The water pump is responsible for sending the engine coolant to the engine.First of all remove the serpentine belt then remove the plastic cove on the passenger side behind the wheel. You will have to remove the pulley. Once the pulley is removed unbolt the water pump and remove it. Clean the surfaces and install new pump. Draining the coolant and replacing it is advisable.Drain the engine coolant, twisting and removing the drain plug at the bottom of the radiator
-------------------Thats it.

hi, is it just water? or does it look more like coolant? if just water, and seems to only leak when a/c or defrost is used, this would likely be the evaperator drain tube letting moisture out. this is normal. but if looks like coolant(reddish pink, or possibly green) this likely means you have a leaking water pump. the water pump is driven by timing belt which is located behind the timing cover directly behind the drive belts. if/when you go to get it repaired, the timing belt should be replaced at the same time. also, you may want to have the timing belt tensioner, and timing belt pulleys relpaced at this time as well, it's good insurance for any repairs that may be needed later down the road after service. make sure to have the drive belts checked when repairing timing belt, they will be removed during repair, if they need to be replaced due to wear, re-install new ones at no extra labor charge.

If all your hose and hose clamps are good. There is a good chance that the water pump has to be replaced, once the water pump bearing is worn. The coolant will leak from the weep hole on the water pump when the engine is running and the only way to stop the leak is to replace the water pump.
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Depending on engine size a 3.1 liter v6 and a 2.2 **** 4cyl. are both located in the front of the engine.
Remove serpentine belt,remove 4 10mm from pulley (v6)(three 13mm for 4cyl.)remove pulley.v6 will have 6 8mm bolts,4cyl. will have 4 13mm bolts-remove clean surfaces install new pump.
About 40 mins.v6,60mins for 4cyl. Be sure to drain coolant before you start, refill whith proper coolant, some 95 up gm require dexcool anti freeze (orange in color).

the water pump is directly above it

Inspect the following: 1.(typical on these models) Possible cooling system caps leak allowing coolant to escape and air into the system. Replace if leaking (there are 2 caps- one cap on the top LH side of the engine and one on the radiator) 2. Radiator fan- This fan on the V-6s are hydraulic driven via powersteering pump, inspect for fluid leaks and proper fluid levels. (To test fan speed, unplug the switch located on the powersteering pump and rev motor to 2000 rpm fan should pick up speed)have it checked if problematic. 3. Replace the thermostat if this hasn't been done in the last 30,000miles, possible binding or stuck (located on the LH side of the engine, under the alternator and at the back end of the coolant feeder pipe). If these all check out fine, inspect or replace the water pump. To replace the pump it requires timing belt removal and or replacement. Hopefully this helps

with my experiance on these engines it's usually the upper outlet hoses running from the heads into a t then into the upper radiator hose they are pain to replace but 3 out of 3 of my v6 isuzu's have had the same problem you'll have to pull off the theromstat and the coil pack the hoses are very small and run from the end of the heads one on each into a t then into the radiator hose just under the housing

it's on the front of the engine. if you paid them , take it back and tell them their repair didn't work.