I have a 99 rav4 changed timing belt clean the head changed water pump and housing but when started the throter is wide open and rpms are running at 400 rpms

Hi
If you haven't ever done one then i suggest take to a garage.
You need to take the engine head off.
Timing belt off.
Radiator flashed / change
all water hoses off and cleaned.
head pressure tested
head skimmed.
Oil flush
New oil and oil filter.

Its not a simple job. whilst everything is open. change the timing belt and water pump as well.

1. Disconnect the negative battery cable.
2. Drain the cooling system.
3. Remove the drive belts. Remove the timing belt covers and the timing belt.
4. Remove the water pump mounting bolts.
5. Separate the water pump from the water inlet pipe and remove the water pump.
6. Inspect the water pump and replace as necessary.

To install:

1. Clean all gasket and O-ring surfaces on the water pump and water pipe inlet tube.
2. Wet a new O-ring with water and install it on the water inlet pipe.
3. Install a new gasket on the water pump.

1. Install the pump inlet opening over the water pipe and press until the pipe is completely inserted into the pump housing.
2. Install the water pump-to-block mounting bolts and tighten to 20 ft. lbs.
3. Install the timing belt and timing belt covers. Install and adjust the drive belts.
4. Reconnect the negative battery cable. Fill the cooling system to the proper level with a 50 / 50 mixture of clean, ethylene glycol antifreeze and water.
5. Run the engine and check for leaks. Top off the coolant level, if necessary.

Your Cabrio has one of several 2.0L Volkswagen engines - determine your engine type from the
8th digit of your VIN, which will be either an "A", or "C",both are 2.0L engines.

Volkswagen 2.0L engines offered in 2001:
(a) 2.0L (Aba) Engine
(b) 2.0L (Aeg/Avh/Azg/Bdc/Bev/Bgd) Engine
(c) 2.0L (Aeg/Avh/Azg/Bdf) Engine

For completeness, I've included the water pump maintenance manual entries for all (3) 2.0L VW
engines offered in 2001. Note that the instructions below include (3) illustrations, which are
reproduced faithfully from the manual, but the last (2) illustrations are identical, since the last two
engines in the list above are virtually identical.

Volkswagen 2001 engines - water pump replacement

2.0L (Aba) Engine

Before servicing the vehicle, refer to the Precautions section.

Remove or disconnect:

1. Coolant

2. Thermostat housing from under the water pump housing.


Loosen but don't remove the bolts holding the pulley to the water pump.

Remove or disconnect:

Timing belt cover.

Alternator and/or steering pump as required to remove the water pump drive belt.

Water pump pulley. On some vehicles, the crankshaft pulley must also be removed by removing the bolts holding the pulley to the timing belt sprocket.

Water pump from its housing.


To install:


Be sure to clean the housing before installing the new gasket. Install the pump into the housing. Pump-to-housing bolts: 84 inch lbs. (10 Nm).

Install the water pump drive pulley. Bolts: 15 ft. lbs. (20 Nm). Install crankshaft drive pulley. Bolts: 15 ft. lbs. (20 Nm).

Adjust drive belt tension and install the thermostat and housing. Bolts: 84 inch lbs. (10 Nm).





Fig. Water pump and thermostat housing-2.0L (ABA) engine

1. Before servicing the vehicle, refer to the Precautions Section.

2. Remove or disconnect:

Coolant

Thermostat housing from under the water pump housing.



3. Loosen but don't remove the bolts holding the pulley to the water pump.

4. Remove or disconnect:

Timing belt cover.

Alternator and/or steering pump as required to remove the water pump drive belt.

Water pump pulley. On some vehicles, the crankshaft pulley must also be removed by removing the bolts holding the pulley to the timing belt sprocket.

Water pump from its housing. Refer to figure of ABA engine's water pump above.

To install:

1. Be sure to clean the housing before installing the new gasket. Install the pump into the housing. Pump-to-housing bolts: 84 inch lbs. (10 Nm).

2. Install the water pump drive pulley. Bolts: 15 ft. lbs. (20 Nm). Install crankshaft drive pulley. Bolts: 15 ft. lbs. (20 Nm).

3. Adjust drive belt tension and install the thermostat and housing. Bolts: 84 inch lbs. (10 Nm).



2.0L (Aeg/Avh/Azg/Bdc/Bev/Bgd) Engine


1. Before servicing the vehicle, refer to the Precautions Section.

2. Remove or disconnect:

Negative battery cable.

Coolant.

Accessory drive belt and tensioner.

Upper and center timing belt covers.



3. Position the engine so that the No. 1 cylinder is at TDC.
WARNING
Cover the timing belt to protect it from being contaminated with coolant.


4. Loosen the timing belt tension and slide the belt off the water pump sprocket.

5. Remove or disconnect:

Timing belt guard (2) mounting bolt (1), if equipped.

Water pump mounting bolts (5), then the water pump (4).

O-ring (3) and clean the seating area.


To install:







Fig. Exploded view of the water pump mounting-2.0L (AEG/AVH/AZG/BDF) engine

1. Install or connect:

O-ring, moistened with coolant.

Water pump so that the plug in the housing faces downward. Mounting bolts: 11 ft. lbs. (15 Nm).

Timing belt guard, if equipped. Mounting bolt: 15 ft. lbs. (20 Nm).

Timing belt.

Upper and center timing belt covers.

Accessory drive belt tensioner. Mounting bolt: 18 ft. lbs. (25 Nm).

Accessory drive belt.

Coolant.

Negative battery cable.



2. Check and clear any DTCs, then match the ECM to the TCM.


2.0L (Aeg/Avh/Azg/Bdf) Engine


1. Before servicing the vehicle, refer to the Precautions section.

2. Remove or disconnect:
1. Negative battery cable.

2. Coolant.

3. Accessory drive belt and tensioner.

4. Upper and center timing belt covers.


3. Position the engine so that the No. 1 cylinder is at TDC.

WARNING
Cover the timing belt to protect it from being contaminated with coolant.

Loosen the timing belt tension and slide the belt off the water pump sprocket.

Remove or disconnect:

1. Timing belt guard (2) mounting bolt (1).

2. Water pump mounting bolts (5), then the water pump (4).

3. O-ring (3) and clean the seating area.


To install:






Fig. Exploded view of the water pump mounting-2.0L (AEG/AVH/AZG/BDF) engine


Install or connect:

1. O-ring, moistened with coolant.

2. Water pump so that the plug in the housing faces downward. Mounting bolts: 11 ft. lbs. (15 Nm).

3. Timing belt guard. Mounting bolt: 15 ft. lbs. (20 Nm).

4. Timing belt.

5. Upper and center timing belt covers.

6. Accessory drive belt tensioner. Mounting bolt: 18 ft. lbs. (25 Nm).

7. Accessory drive belt.

8. Coolant.

9. Negative battery cable.


Check and clear any DTCs, then match the ECM to the TCM.

DRAIN COOLANT SYSTEM.DISCONNECT THE RADIATOR INLET HOSE FROM INLET PIPE. REMOVE THE TIMING BELT FROM THE WATER PUMP PULLEY. REMOVE THE RIGHT SIDE IGNITION COIL.REMOVE THE WATER INLET HOUSING AND THERMOSTAT.REMOVE THE MOUNTING BOLTS AND STUDS. LIFT OUT THE WATER PUMP BY CAREFULLY PRYING BETWEEN THE PUMP AND THE CYLINDER HEAD. REMOVE ALL THE OLD PACKING AND CLEAN THE MOUNTING SURFACES. INSTALL NEW SEAL PACKING TO THE WATER PUMP GROOVE AND A NEW O - RING TO THE WATER BYPASS PIPE.INSTALL THE TIMING BELT AND CONNECT THE INLET HOSE TO THE INLET PIPE.THEN REFILL THE COOLING SYSTEM. RUN THE ENGINE CHECK FOR LEAKS.

Hello: Open hood, stand in front of car look on left side (driver side) of engine toward the radiator, there will be a black metal guard, under the guard there will be a small belt. This is the belt that drives the water pump. Make sure the belt is there. If belt is there start car and with engine running check to be sure belt is turning and that the water pump is turning. If all that is okay then you may have blown head gaskets. To check head gaskets you need a sniffer tool to smell the engine coolant which will tell you if you have exhaust gas in the coolant.

REMOVAL & INSTALLATION
2.0L Engine

1. Disconnect the negative battery cable.

CAUTION Never open, service or drain the radiator or cooling system when hot; serious burns can occur from the steam and hot coolant.

1. Drain the engine cooling system.
2. Raise and safely support the vehicle.
3. Remove the lower radiator hose from the water pump.

If the lower radiator hose is hard to reach on the back of the water pump, remove the hose at the radiator and after the water pump is ready to be removed, pull the water pump away from the engine block until there is enough room to remove the hose from the pump.

1. Lower the vehicle.
2. Remove the accessory drive belt.
3. Remove the timing belt covers and the timing belt as outlined in this Section.
4. Remove the four water pump retaining bolts.
5. Remove the water pump.
   

To install:

1. Thoroughly clean all sealing surfaces.
2. Install a new water pump gasket and the water pump onto the cylinder block.
3. Tighten the retaining bolts to 12-15 ft. lbs. (16-20 Nm).
4. Reinstall the timing belt and the timing belt covers as outlined in this Section.
5. Reinstall the accessory drive belt.
6. Raise and safely support the vehicle.
7. Reinstall the lower radiator hose.
8. Lower the vehicle.
9. Fill the engine cooling system.
10. Reconnect the negative battery cable.
11. Start the engine and top off the coolant as necessary. Check for leaks.

2.5L Engine

Before continuing with this procedure, be sure three new water pump retaining bolts (W701544) are available. Due to their torque-to-yield design, the bolts stretch and cannot be reused.

1. Disconnect the negative battery cable.

CAUTION Never open, service or drain the radiator or cooling system when hot; serious burns can occur from the steam and hot coolant.

1. Drain the engine cooling system.
2. Remove the water pump pulley shield.
3. Remove the water pump drive belt.
4. Remove the water pump inlet and outlet hoses from the water pump.
5. Remove the three water pump to left cylinder head retaining bolts.
6. Remove the water pump and water pump housing from the vehicle.
7. Remove the water pump to water pump housing retaining bolts and separate the water pump from the water pump housing.

To install:

1. Thoroughly clean all sealing surfaces.
2. Install the water pump to the water pump housing using a new gasket and install the retaining bolts. Tighten the retaining bolts to 16-18 ft. lbs. (22-25 Nm).
3. Position the water pump and water pump housing and install three new torque-to-yield retaining bolts into the left cylinder head.
4. Tighten the new retaining bolts to 11-13 ft. lbs. (15-18 Nm), then rotate the retaining bolts 85-95 degrees.
5. Reinstall the water pump inlet and outlet hoses to the water pump.
6. Reinstall the water pump drive belt.
7. Reinstall the water pump shield.
8. Fill the engine cooling system.
9. Reconnect the negative battery cable.
10. Start the engine and top off the coolant as necessary. Check for leaks.

Hope helps (remember comment and rated this).

Not difficult at all. Drain radiator. Use 10 millimeter wrench and loosen water pump pulley bolts. The easy way to prevent pulley from turning is place a 3/8 inch drive ratchet in the belt tensioner and increase belt pressure to hold pulley. After bolts are loose, relieve tension on belt to remove it. Then remove bolts from pulley followed by pulley itself. There are 5 8 millimeter headed bolts holding pump on housing. Remove all five, clean housing surface, install new pump and gasket. Although there are five holes it will only line up one way. Pay attention to the removal of the original pump to line up new one. Reverse removal proceedure. Open bleeder screw(s) when refilling radiator. One will be one the metal tube above the water pump housing. The other will be at the opposite end of the engine where the radiator hose meets a metal outlet. This one will need to be opened a few times to bleed air as the thermostat opens after engine is cranked. Hope this helps.

Here are the steps required to change the water pump on the 3.0L engine.

1. Disconnect the negative battery cable.
2. Drain the cooling system.
3. Remove the drive belts. Remove the timing belt covers and the timing belt.
4. Remove the water pump mounting bolts.
5. Separate the water pump from the water inlet pipe and remove the water pump.
6. Inspect the water pump and replace as necessary.

To install:

1. Clean all gasket and O-ring surfaces on the water pump and water pipe inlet tube.
2. Wet a new O-ring with water and install it on the water inlet pipe.
3. Install a new gasket on the water pump.

1. Install the pump inlet opening over the water pipe and press until the pipe is completely inserted into the pump housing.
2. Install the water pump-to-block mounting bolts and tighten to 20 ft. lbs. (27 Nm).
3. Install the timing belt and timing belt covers. Install and adjust the drive belts.
4. Reconnect the negative battery cable. Fill the cooling system to the proper level with a 50/50 mixture of clean, ethylene glycol antifreeze and water.
5. Run the engine and check for leaks. Top off the coolant level, if necessary.

It sounds like to me your mechanic recommened you change your timing belt and water pump due to a maintance issue. If vehicle still runs good with old timing belt new belt wont change running. Cold weather and low cranking amps (poor battery) will cause starting problems.