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ECU Coolant Temperature Sender Replacement
 
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Pelican Technical Article:

ECU Coolant Temperature Sender Replacement

Jared Fenton

Time:

1 hour1 hr

Tab:

$20

Talent:

***

Tools:

Small screwdriver, silicone grease

Applicable Models:

Jetta MkIV 2.0L (1998-05)

Parts Required:

ECU coolant temperature sender

Hot Tip:

Drain coolant before starting job

Performance Gain:

Better running engine

Complementary Modification:

Replace coolant

The ECU coolant temp sender is used to provide the vehicle's fuel injection computer (or ECU) with a constant temperature signal. This is used primarily when the engine is cold. When the ECU senses the engine is cold, it provides a slightly richer fuel mixture to help the engine warm up faster. Many times, a rich running car can be traced back to this sensor. Keep in mind that there are two coolant temp senders on the Mk4 Jetta 2.0. The other sender is used to provide a signal to the temperature gauge. That sender is located in the radiator.

The ECU sender is located directly to the side of the cylinder head, branched off the upper radiator hose. In order to access the sender, it helps to remove the air filter housing. See our article on Air Filter Housing Removal for more information. You'll also need to drain the coolant to prevent it leaking out once you remove the sender. See our article on Coolant Flush and Replacement for more information.

Shown here is the ECU coolant temp sender mounted in the upper radiator hose assembly (green arrow) .
Figure 1

Shown here is the ECU coolant temp sender mounted in the upper radiator hose assembly (green arrow) . Be sure to drain the coolant before removing the sender.

Use a small screwdriver to pry out the locking clamp (green arrow) and then pull the sender (yellow arrow) up and out of the mounting flange.
Figure 2

Use a small screwdriver to pry out the locking clamp (green arrow) and then pull the sender (yellow arrow) up and out of the mounting flange.

Press the tab on the electrical connector (green arrow) and pull it off the sender.
Figure 3

Press the tab on the electrical connector (green arrow) and pull it off the sender. Also note the O-ring (yellow arrow). Often times, this will be left behind inside the mounting flange. When fitting the new sender, use a new O-ring and coat it with a bit of silicone grease. This will help to seal it in place. The rest of the procedure is the reverse of removal.

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