Porshe 911 (997). Manual - part 96

- checking

Tools

Designation

Type

Number Explanation

Vacuum cleaner nozzle, long
crevice tool for cleaning
cooling air inlet shafts

commercially
available tool

NR.160

checking

Coolant - check antifreeze and fluid level

Note

The coolant filled in at the factory is intended for lifetime cooling and, thus, need not be changed.

• 

Use of the anti-freeze testing device

WARNING

Danger of scalding from hot pressurised coolant.

541

→ Only work on the coolant system when the engine is

"cool".

→ Wear protective gloves and goggles.

WARNING

Coolant is corrosive and hazardous to health.

Skin and eye irritation

• 

→ Wear protective gloves and goggles.

→ If you come into contact with coolant, wash off immediately with plenty of warm water.

ATTENTION

Mixing coolant.

Corrosion of components and flocculation of coolant

• 

→ Do not mix Porsche coolant with other coolants.

→ When replacing or topping up coolant, use only original Porsche coolant (see Porsche Parts Catalogue).

1. Check antifreeze content. To do this, open the lid on the coolant expansion tank and check with an

anti-freeze testing device. If this is below - 35°C, correct the anti-freeze content by raising the proportion
of pure coolant accordingly

Checking the cooling system for leaks

No leaks in the cooling system

WARNING

Danger of scalding from hot pressurised coolant.

→

Diagnostic system: reading out fault memory and activating systems

Coolant - check antifreeze and fluid level

542

Only work on the coolant system when the engine is
"cool".

→ Wear protective gloves and goggles.

1. Check the cooling system for leaks. To do this, apply a test pressure of approx. 1 bar and check hose

connections for leakage

Cleaning the cooling air guides

Cooling air openings

ATTENTION

Soiling and damage to radiator surface (vanes).

Engine overheating due to lack of cooling performance.

• 

→ Clean radiator surface regularly.

→ Do not use a high-pressure steam cleaner to clean it.

1. Check cooling air guides and radiator for foreign bodies such as leaves. If necessary, carefully

clean the cooling air guides and radiator surfaces at the front using a vacuum cleaner with a single
nozzle, see Vacuum cleaner nozzle, long crevice tool for cleaning cooling air inlet shafts
NR.160

. When using high-pressure steam cleaners, the steam jets can cause additional particles of

dirt to attach to the radiator surfaces and the engine can overheat due to reduced cooling
performance

Checking the antifreeze content using a refractometer

Diagnostic system: reading out fault memory and activating systems

Checking the cooling system for leaks

543

Display scale refractometer

Note

The following diagram shows the scale used by Leitenberger

• 

The scales can vary, depending on the manufacturer, observe the operating instructions

• 

Use the "ETHYLENE" scale for Porsche coolant.

• 

1. The correct antifreeze content can be read off the ETHYLENE scale

Position

Designation

Explanation

-A-

Scale for propylene-based

coolant

Do not use the scale for engine

types M96/03, M96/05 und

M97/01

-B-

Scale for ethylene-based

coolant

Use scale for 997 engines

-C-

Scale for battery acid

The charge state of a battery

can be checked here. The

figures indicate the gravity of

electrolyte. The battery must

be recharged once the charge

drops below 1.20.

-D-

Scale for alcohol-based

windscreen cleaner

The freezing point of the

windscreen cleaner can be

read off here.

-E-

Light/dark limit

In conjunction with the points

of intersection of the relevant

scales, it specifies the value to

be established

-F-

Waterline

The light/dark limit must be
located here when sprinkled

with distilled water

Diagnostic system: reading out fault memory and activating systems

Checking the antifreeze content using a refractometer

544