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Turbo Coolant Pump Replacement
 
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Pelican Technical Article:

Turbo Coolant Pump Replacement

Steve Vernon

Time:

1 hour1 hr

Tab:

$225

Talent:

**

Tools:

13mm wrench, flathead screwdriver

Applicable Models:

Porsche 944 Turbo (1986-89)

Parts Required:

Turbo Coolant Pump

Hot Tip:

Be prepared for spilled coolant

Performance Gain:

Proper coolant to the turbo

Complementary Modification:

Flush coolant system

The Porsche 951 has an auxiliary coolant pump that flows coolant to the turbo after the motor has shut off. The turbo coolant pump should run for approximately 30 seconds after you shut the motor off to prevent heat damage. You can usually hear the pump when it is running, especially when the motor is turned off. If your pump does not run or runs on for long periods of time, you may want to check the thermoswitch first and then replace the pump. Please see our article on thermoswitch replacement for additional assistance.

You will need to drain the coolant and then fill and bleed the system to perform this work. Please see our article on coolant draining and refill for additional information.

Make sure the car is cool to the touch before working with the coolant.

The radiator drain plug is located on the lower left side of the radiator at the front of the vehicle (red arrow).
Figure 1

The radiator drain plug is located on the lower left side of the radiator at the front of the vehicle (red arrow). You will need to remove the under engine tray to access it. If you need help removing the tray please see our article on under body tray removal for additional assistance. When the coolant drains it tends to run along the lower radiator mounting plate and drain out from it in several places. Be prepared to catch the fluid with a larger tray or a couple of buckets. Please see our article on coolant flush and replacement for additional assistance.

The turbo coolant pump is located on the left side of the engine bay between the coolant expansion tank and the throttle body (yellow arrow).
Figure 2

The turbo coolant pump is located on the left side of the engine bay between the coolant expansion tank and the throttle body (yellow arrow). You will need to remove the intake air tube. Use a flathead screwdriver and remove the two screws (red arrows) and the cold air intake tube to the air box.

With the screws removed pull the tube out from the forward fender area (red arrow) and remove.
Figure 3

With the screws removed pull the tube out from the forward fender area (red arrow) and remove.

Use a flathead screwdriver and loosen all the hoses attached to the intake tube (red arrows).
Figure 4

Use a flathead screwdriver and loosen all the hoses attached to the intake tube (red arrows). Separate the hoses attached to the tube and remove the tube from the vehicle.

With the throttle body intake tube out of the way you can see the turbo coolant pump (red arrow).
Figure 5

With the throttle body intake tube out of the way you can see the turbo coolant pump (red arrow).

Use a flathead screwdriver and loosen all the clamps on the intake tube from the air box to the turbo and remove the tube from the engine (red arrow).
Figure 6

Use a flathead screwdriver and loosen all the clamps on the intake tube from the air box to the turbo and remove the tube from the engine (red arrow).

There are three attachments to the turbo pump; the line from the coolant expansion tank (yellow arrow), the electrical connection (green arrow) and the line out to the turbo (red arrow, behind the pump).
Figure 7

There are three attachments to the turbo pump; the line from the coolant expansion tank (yellow arrow), the electrical connection (green arrow) and the line out to the turbo (red arrow, behind the pump).

Disconnect the electrical connection by gently pulling them apart (red arrow).
Figure 8

Disconnect the electrical connection by gently pulling them apart (red arrow).

Use a flathead screwdriver and loosen the clamp on the lower hose and separate the hose from the pump (red arrow).
Figure 9

Use a flathead screwdriver and loosen the clamp on the lower hose and separate the hose from the pump (red arrow). This is a low point that will have some fluid in it so be prepared.

use a 13mm wrench and loosen the clamp in the mounting bracket (red arrow).
Figure 10

use a 13mm wrench and loosen the clamp in the mounting bracket (red arrow).

Slide the pump down and out from the bracket.
Figure 11

Slide the pump down and out from the bracket. This will give you access to the coolant line to the turbo. The line is wrapped in heat shield. There is not a lot of room to work so take your time. Use a flathead screwdriver and loosen the clamp and slide the pump off the hose. Installation is the reverse of removal.


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