cooling SKODA OCTAVIA 1997 1.G / (1U) 1.8 92kw Engine Workshop Manual

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19Cooling System
Edition 11.96

Coolant mixing ratios ⇒ page 19-3.
Inspecting cooling system for leaks ⇒ page 19-8.
Note:
Always replace seals and gaskets.
1 - Expansion reservoir
2 - Intake manifold 3 - Connection fitting with throttle valve
control unit
4 - Heat exchanger for heating system
5 - ATF cooler ♦ Only on models with automatic gear- box
6 - Radiator ♦ After replacing, fill entire system with fresh coolant
♦ Removing and installing⇒ page 19-9

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19Cooling System
Edition 08.96

Testing cooling system for leaks
Special tools, testers and aids required
Cooling system tester V.A.G 1274
Adapter V.A.G 1274/8
Adapter V.A.G 1274/9
Test condition
Engine at operating temperature
Test procedure
- Open cap of coolant expansion reservoir.
Important! Hot steam may escape when the expansion re-servoir is open. Cover over cap with cloth and open
carefully.
- Mount tester V.A.G 1274 with adapter V.A.G
1274/8 onto the expansion reservoir.
- Operate the priming pump of the tester to produce a pressure of about 0.1 MPa.
- If the pressure drops, locate the leakage point and rectify.
Testing pressure relief valve in cap
- Screw cap onto the tester using adapter V.A.G 1274/9.
- Operate the priming pump of the tester to produce a pressure of about 0.15 MPa.
- The pressure relief valve should open at a pressure of 0.12 ... 0.15 MPa.

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Edition 11.96


Removing and installing radiator
Notes:
Always replace seals and gaskets.
Lifting vehicle with lift platform page 10-1,
Removing and installing engine.
Special tools, testers and aids required Torque wrench 5...50 Nm (e.g. V.A.G 1331)
Wire
Removing
- Drain coolant page 19-3.
- Unplug connector of thermostatic switch
(F18) -1- and separate plug connections -2- and -3- at the fan shroud (press locking cat- ches).
- Detach coolant hoses at connection fitting of the radiator (pull off retaining clip).
Models with air conditioning
- Unscrew the 4 bolts -arrows- attaching the
condenser.
Important!
The refrigerant circuit of the air conditioning sys-tem must not be opened.
Note: In order to avoid damage to the condenser andalso to the refrigerant pipes/hoses, ensure that
the pipes and hoses are not over-tensioned,kinked or bent.

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19Cooling System
Edition 11.96

- Detach bracket -arrow- for refrigerant pipe. Continued for all models
- Remove both headlights: ⇒ Electrical System; Repair Group 94; Re- moving and installing headlights
- Remove the 4 bolts -arrows- for attaching
the top radiator mount.
- Remove the 4 bolts -arrows- for attaching
the bottom radiator mount.

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Edition 11.96


Models with air conditioning
- Pull out radiator slightly together with conden-
ser.
- Detach clip -arrow- for attaching refrigerant
pipe.
Continued for all models
- Remove fan shroud (4 bolts).
Note: When removing and installing the fan shroud,ensure that the radiator ribs are not damaged.
- Carefully take out the radiator downward. Installing Installation is performed in the reverse order; pay attention to the following points:
- Tighten thermostatic switch -1- to
35 Nm.
- Fit on the brackets -2- and -3- at the radiator, as illustrated.
- Tighten the bolts for attaching the fan shroud and radiator mounts to
10 Nm.
- On models with air conditioning, tighten the bolts for attaching condenser and bracketsfor refrigerant pipes to10 Nm.
- Replace O-rings in the connection fittings of the coolant hoses.
- Insert drain plug for coolant.
- Fill system with coolant ⇒ page 19-3.
- Install headlights: ⇒ Electrical System; Repair Group 94; Re- moving and installing headlights
- Electrical connections and routing: ⇒ Current Flow Diagrams, Electrical Fault Finding and Fitting Locations binder