1997 SKODA OCTAVIA engine coolant

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Edition 11.96


The two rear jacking points are located at the rear of both side members at the level of the marking on the sill.
- Remove noise insulation panel -arrow-.
- Open cap of coolant expansion tank.
- Place drip tray (e.g. V.A.G 1306) below the
engine.
- Turn drain plug -arrow- at the radiator to the
left; fit auxiliary hose onto connection if ne-
cessary.

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17Lubrication System
Edition 08.96

Testing oil pressure and oil pressure switch
Special tools, testers and aids required
Oil pressure tester (e.g. V.A.G 1342)
Diode test lamp (e.g. V.A.G 1527)
Adapter cable set (e.g. V.A.G 1594)
Current flow diagram
Operation of dynamic oil pressure warning system
Testing warning lamp After ignition on („terminal 15 on“) and engine not running, the oil pressure warning lamp flashes (not on models with Auto Check System).
Warning criteria
Engine not running and oil pressure switch closed.
Coolant temperature greater than 60 °C, engine speed greater than 1500 rpm and oil pressure switch open.
At an engine speed of more than 5000 rpm an active oil warning is not cancelled, irrespective of the position of the oil pressure switch.
If the voltage supply of the control unit is o.k. (terminal 15) and the oil pressure switch is open for longer than 0.5 seconds at engine speeds of more than 1500 rpm, this is stored. If this condition occurs three times during „terminal 15 on“, the warning becomes or remains active even at engine speeds of less than 1300 rpm.
Test conditions
Engine oil level o.k.; inspect page 17-10
Oil pressure warning lamp (K3) should come on when ignition switched on.
The o.k. readout on vehicles with Auto Check System should come on (select symbol)
Engine oil temperature at least 80 °C (radiatorfan should have cut in once)

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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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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