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Pelican Technical Article:

Oil Cooler Replacement

Jared Fenton

Time:

2 hours2 hrs

Tab:

$80

Talent:

**

Tools:

27mm socket or wrench, hose clamp pliers, oil filter wrench, floor jack, jack stands, wheel chocks, safety glasses, torque wrench

Applicable Models:

Jetta MkIV 2.0L (1998-05)

Parts Required:

Oil cooler

Hot Tip:

Drain the oil beforehand

Performance Gain:

Cool oil is happy oil

Complementary Modification:

Change engine oil

Over time, oil coolers can corrode internally. This eventually leads to both oil and coolant leaks. Having the coolant mix with the engine oil can damage the engine. In this article, I'll go over the steps involved with changing the oil cooler.

The oil cooler on the AVH 2.0 engine is located directly above the oil filter. It works by circulating engine coolant through the cooler as the oil is circulated down through the filter.

Replacing the oil cooler is pretty easy although it does require you to jack up the front end of the car. You'll also need to remove the secondary air pump as well as draining both the engine oil and coolant. See our articles on Jacking up Your Mk4 Jetta, Engine Oil Change, Coolant Flush and Replacement and Secondary Air Pump Removal for more information.

After the engine oil has been drained from the car, loosen and remove the oil filter (green arrow).
Figure 1

After the engine oil has been drained from the car, loosen and remove the oil filter (green arrow). Depending on how tight the filter is installed, you may need to use a specialty oil filter wrench.

Loosen and remove the 27mm nut (green arrow) securing the oil cooler to the oil filter housing assembly.
Figure 2

Loosen and remove the 27mm nut (green arrow) securing the oil cooler to the oil filter housing assembly.

Pull the oil cooler down and off the housing assembly.
Figure 3

Pull the oil cooler down and off the housing assembly. Be sure that you remove the rubber seal (green arrow) between the cooler and the housing. These seals can sometimes stick in place.

Now use a pair of hose clamp pliers to loosen and slide back the clamps on the coolant lines.
Figure 4

Now use a pair of hose clamp pliers to loosen and slide back the clamps on the coolant lines. Pull the coolant lines off the oil cooler. Be prepared for a bit of coolant to drain out. Installing the new cooler is the reverse of removal. Be sure to use a new rubber seal (purple arrow) when installing the new cooler.

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Page last updated: Sat 12/3/2016 03:10:24 AM