2002 Chevy Malibu is leaking a small amount of coolant from the heater hose that connects to manifold. How do I remove and replace the adapter that connects to the heater hose?

Engine coolant temperature sensor may be bad .

There are none. The Transmission does not use water to cool it.

Obisouvly a leak somewhere.Would start with upper and lower radiator hoses with vehicle running and at normal operating temp.This will allow the cooling system to build pressure,look for signs of wetness at hoses as well as heater core hoses from water pump to usually the firewall where they go into the passenger compartment to the heater core.

Removal & Installation

• 4.6L & 5.4L SOHC ENGINES
• 5.4L & 6.8L ENGINES
• 5.4L DOHC ENGINE
• 6.0L DIESEL ENGINE

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4.6L & 5.4L SOHC Engines

1. Partially drain the engine cooling system to a level below the thermostat.
2. Disconnect the upper radiator hose from the water outlet adapter.
3. Remove the power steering reservoir upper mounting bracket.
4. Remove the bolts and remove the water outlet adapter.
5. Remove the water thermostat and the O-ring seal. Discard the O-ring seal.
6. Installation is the reverse of the removal procedure. Tighten the water outlet adapter bolts to 18 ft. lbs. (25 Nm). Tighten the power steering reservoir upper mounting bracket as shown in the accompanying illustration.
   
   

   Fig. View of the power steering reservoir upper mounting bracket and tightening specifications
   
   
   

   Fig. Exploded view of the water outlet adapter and tightening specifications
   

5.4L & 6.8L Engines

1. Partially drain the cooling system to a level below the thermostat.
2. Disconnect the upper radiator hose.
3. Remove the coolant outlet connection, as follows:
   1. Remove the bolts.
   2. Remove the coolant outlet connection.
   
   
4. Remove the (A) coolant thermostat and the (B) O-ring seal.
5. Discard the (B) O-ring seal.
   
   

   Fig. Remove the (A) coolant thermostat and the (B) O-ring seal
   

To install:

NOTE Thermostat must be installed as illustrated.

1. Use a new (A) O-ring seal to position the (B) coolant thermostat in the (C) upper intake manifold.
   
   

   Fig. Use a new (A) O-ring seal to position the (B) coolant thermostat in the (C) upper intake manifold
   

2. Install the coolant outlet connection, as follows:
   1. Position the coolant outlet connection on the upper intake manifold.
   2. Install the bolts and tighten to 15-22 ft. lbs. (20-30 Nm).
   
   
3. Connect the upper radiator hose.
4. Fill the cooling system.

1. Before servicing the vehicle, refer to the precautions section.
2. Partially drain the cooling system to a level below the thermostat.
3. Disconnect the upper radiator hose.
4. Remove the coolant outlet connection, as follows:
   1. Remove the bolts.
   2. Remove the coolant outlet connection.
   
   
5. Remove the (A) coolant thermostat and the (B) O-ring seal.
6. Discard the (B) O-ring seal.
   
   

   Fig. Remove the (A) coolant thermostat and the (B) O-ring seal
   

To install:

NOTE Thermostat must be installed as illustrated.

1. Use a new (A) O-ring seal to position the (B) coolant thermostat in the (C) upper intake manifold.
   
   

   Fig. Use a new (A) O-ring seal to position the (B) coolant thermostat in the (C) upper intake manifold
   

2. Install the coolant outlet connection, as follows:
   1. Position the coolant outlet connection on the upper intake manifold.
   2. Install the bolts and tighten to 15-22 ft. lbs. (20-30 Nm).
   
   
3. Connect the upper radiator hose.
4. Fill the cooling system.

5.4L DOHC Engine

1. Partially drain the engine cooling system to a level below the thermostat.
2. Disconnect the upper radiator hose, the heater water inlet hose and the heated PCV inlet hose from the water outlet adapter.
   
   

   Fig. Disconnect the upper radiator hose, the heater water inlet hose and the heated PCV inlet hose from the water outlet adapter
   

3. Remove the water hose connection and thermostat.
4. Installation is the reverse of the removal procedure. Tighten the mounting bolt to 18 ft. lbs. (25 Nm).
   
   

   Fig. Exploded view of the thermostat-5.4L DOHC engine
   

It sounds like you're looking at the heater core water lines. These connect to the heater core supply and return inlet and outlet pipes to bring hot coolant into the cabin for heat and windshield deicing.

The heater core is a mini radiator and operates on the exact same principles as the radiator does. The heater core is located behind the dash board on the passenger side. Look for a wet spot of antifreeze on the passenger side floor area - close to the firewall for an indication of a leaky heater core. If it is leaking, it will likely need to be replaced. This can be a pricey repair.

Good luck!

the heater core is the only thing you havent replaced besides the thermostat so feel the carpets and floor around the floor heater out puts to see if there damp or sticky they may smell like a sweet smell as well.

The problem is the heater core leaking behind the dashboard. Heater Core Removal & Installation 1997-2002 To Remove:
NOTE: Heater core must be vacuum leak tested before it is remove from vehicle if a heater core leak is suspected.

1. Drain engine coolant.
2. Remove instrument panel.
3. For 5.4L (4V), if quipped, remove junction splash shield.
4. For 5.4L (4V), if quipped, disconnect starter relay cable.
   
   
5. For 5.4L (4V), if quipped, remove junction block bracket.
6. Clamp inlet and outlet heater hoses.
7. Disconnect heater hose from heater core by gently pressing it toward heater core.
8. Remove A/C plenum demister adapter.
9. Disconnect vacuum line.
10. Remove 13 plenum chamber top screws.
11. Remove blend door assembly from case.
12. Remove heater core.

To Install:
NOTE: If needed, clean and lubricate coolant hoses with plain water.

1. Install heater core.
2. Install blend door assembly to case.
3. Install 13 plenum chamber top screws.
4. Connect vacuum line.
5. Install A/C plenum demister adapter.
6. Connect heater hose to heater core.
7. Release all clamps from inlet and outlet heater hoses.
8. For 5.4L (4V), if quipped, install junction block bracket.
9. For 5.4L (4V), if quipped, connect starter relay cable.
10. For 5.4L (4V), if quipped, install junction splash shield.
11. Install instrument panel.
12. Refill engine coolant.

If you are trying to replace the intake manifold due to a crack in the plastic check out a great option in repairing it.

http://www.youtube.com/watch?v=HK9cXijBnRc

http://cgi.ebay.com/ebaymotors/2000-2002-Saturn-SL2-intake-manifold-part-_W0QQcmdZViewItemQQhashZitem1e5bc99c9dQQitemZ130388958365QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories

1. drain coolant
2. remove engine cover
3. remove the 2 bolts from water hose connection (upper rad hose connecting to)
4. remove o-ring and thermostat
5. repeat in reverse order

is electric radiator fan coming on? if not the relay or fuse is bad