AUDI A4 1997 1.8 CAT CUT IOFF SOUND FULL

Unplug the sending unit electrical connector and turn the ignition switch On.

This will prevent damage to the computer.

Then turn the ignition switch On to check gauge or warning light response as indicated in the following steps.

Make sure to turn the ignition switch Off before unplugging wires.

The codes may point to the source of the problem, usually a sensor or circuit issue.

If the check engine light is on, check for diagnostic trouble codes (DTC) first.

A radiator front blocked with bugs and debris.

Coolant not flowing, due to a clogged radiator, partially open or stuck-closed thermostat, or a bad water pump.

Visually check radiator neck and cap for damage, and test cap pressure, if necessary.

In some cases this may lead to detonation (a banging sound).

Check for leaks, including the radiator, water pump, heater core, hoses, and cylinder head gasket, as necessary.

Check both reservoir tank and radiator.

However, if the gauge approaches the higher (hot) end of the scale under normal driving conditions, it usually points to problems with the cooling system. If the Temperature Gauge Is Reading HighДЄ temperature gauge will normally rise above the middle range when driving in heavy traffic, carrying or pulling a heavy load, or going up a steep hill. If you see coolant leaking, the system is running out of coolant and the engine is overheating.ДЄ clogged radiator is hard to diagnose since you can't see coolant flow restriction. Check radiator hoses, radiator, and water pump.

Look around for potential signs of leakage.

If both upper and lower radiator hose have about the same temperature, coolant is not circulating (overheating) or the thermostat is stuck open (engine below operating temperature).

The lower radiator hose should feel a bit warm but not as hot as the upper hose.

Also, the heater might not produce enough heat. The gauge will read below the regular temperature.

If the hose and engine feel a bit warm but not hot, the thermostat is likely stuck open and will prevent the engine from reaching operating temperature.

Any of these will lead to engine overheating.

If the hose feels cool or warm but the engine feels hot, either the thermostat is stuck closed, the radiator is clogged, or the water pump is not working.

The upper radiator hose connects the upper radiator tank to the engine at the thermostat housing.

If the cooling fan doesn't turn on, it will lead to overheating.Д¬ompare the temperature of the engine head, near the thermostat, and the upper radiator hose.

The cooling fan should start running at approximately 230В° F (110В° C), which usually happens after 20 minutes of engine operation.

A rusty or cloudy color indicates contamination and may lead to overheating. The level should be about 1/2 an inch below the bottom of the radiator neck but above the radiator core.

If your car doesn't have a reservoir or recovery tank, wait for the engine to cool and check the level through the radiator neck.

A low level will lead to engine overheating.

AUDI A4 1997 1.8 CAT CUT IOFF SOUND FULL

The coolant level should be at the Full Hot mark on the coolant reservoir tank. Pop the hood open and check the following:

Audi a4 1997 1.8 cat cut ioff sound