Parts Catalog Accessories Catalog Tech Info Tech Forums
 
Follow Pelican Parts on Facebook Follow Pelican Parts on Twitter Follow Pelican Parts on Instagram Follow Pelican Parts on YouTube Follow Pelican Parts on Pinterest Follow Pelican Parts on Tumblr
  Search our site:    
View Recent Cars  |   Cart  | Project List | Order Status | Help    
 >  >
Thermostat Replacement
 
Bookmark and Share

Pelican Technical Article:

Thermostat Replacement

Steve Vernon

Time:

2 hours2 hrs

Tab:

$40

Talent:

**

Tools:

Philips screwdriver, 12mm socket or wrench, large drain pan

Applicable Models:

BMW E10 2002 Coupe/Conv (1967-76)
BMW E21 320i Coupe (1977-83)

Parts Required:

Thermostat

Hot Tip:

Work on a cool car

Performance Gain:

Proper operating temperature

Complementary Modification:

Flush the radiator

The thermostat helps control the engine's temperature. If your car is running too hot and there is the proper amount of coolant in the car and it is not leaking, or your car is taking a long time to warm up, there is a very good chance your thermostat is bad and needs to be replaced. The thermostat on the BMW 2002 is contained in a housing that attaches to three hoses. You must replace the complete housing when changing out the thermostat.

Due to the location of the thermostat you will need to drain most of the coolant from the vehicle. Make sure the car is cool and not under pressure. Working on a hot engine or one under pressure can cause serious harm and should never be attempted. Coolant needs to be collected and disposed of in accordance with your local regulations. Pouring coolant down a drain or into the street is illegal (coolant is also very toxic). Also, be sure to wash your hands thoroughly after working around it.

Coolant last a much longer time than they did in the past so if your coolant is still good there is no need to dispose of it. Drain it into a clean container and you can reuse it. If your coolant is old this is a great time to drain and flush the complete system. Please see our article on coolant drain and flush for additional assistance with that project. This is also a very good time to check the condition of your hoses.

The thermostat is located on the right front of the engine and is connected to three hoses (red arrow).
Figure 1

The thermostat is located on the right front of the engine and is connected to three hoses (red arrow). It is contained in the thermostat housing. If you are replacing it, you will be replacing the complete unit.

While you can replace the thermostat without completely draining the coolant system, due to the fact that it is located at a low point, you will be losing all the coolant in the vehicle until it gets to the level below the thermostat.
Figure 2

While you can replace the thermostat without completely draining the coolant system, due to the fact that it is located at a low point, you will be losing all the coolant in the vehicle until it gets to the level below the thermostat. Do yourself a favor and drain the system. If the coolant is new, drain it into a very clean container. You can reuse it. If it is old now would be a good time to give the system a complete flush. Remember, coolant is toxic and should always be disposed of in accordance with the regulations in your area. Never pour it in the ground, sewer, street or flush it down a sink. On our car we used a 12mm socket to remove the drain plug (red arrow) on the bottom of the radiator. Of course we are working on the Clarion Build's BMW 2002. We have a slick polished aluminum radiator, so check the drain bolt on your car for the correct size wrench.

The coolant will drain and spill out over the suspension pieces as well as the front valance, so make sure you have a large container to catch it in.
Figure 3

The coolant will drain and spill out over the suspension pieces as well as the front valance, so make sure you have a large container to catch it in.

Working below the car use a Philips head screwdriver and remove the lower hose that connects the thermostat to the lower right radiator (red arrow).
Figure 4

Working below the car use a Philips head screwdriver and remove the lower hose that connects the thermostat to the lower right radiator (red arrow).

Next, remove the hose clamp and disconnect the hose from the top of the motor to the top of the thermostat (red arrows).
Figure 5

Next, remove the hose clamp and disconnect the hose from the top of the motor to the top of the thermostat (red arrows). Be prepared. Even though you have drained the coolant, additional coolant will come out. Next, remove the hose clamp and slide the thermostat off the hose that connects it to the water pump (yellow arrow). Again, be prepared because even though you have drained the coolant additional coolant will come out

You can now remove the thermostat in its housing from the engine bay.
Figure 6

You can now remove the thermostat in its housing from the engine bay.

This photo illustrates how the thermostat is contained within the housing and must be replaced as a unit (red arrow).
Figure 7

This photo illustrates how the thermostat is contained within the housing and must be replaced as a unit (red arrow).

With the thermostat and hoses out of the vehicle you can see how they attach.
Figure 8

With the thermostat and hoses out of the vehicle you can see how they attach. The yellow hose attaches to the top of the motor by the head and runs coolant down to the thermostat (blue arrow). Until the engine warms up to the temperature that will open the thermostat, the coolant goes through the hose attached to the water pump (red arrow) and circulates. Once the coolant temperature has risen to the point that the thermostat opens, the coolant is then directed from the water pump (red arrow) and flows to the hose connected to the lower right side of the radiator for additional cooling. Installation is the reverse of removal. Do not forget to refill the system with coolant.


Bookmark and Share

  Search our site:    

View Cart & CheckOut | Project List | Order Status |  Help    

 

[Home] [Customer Service] [Shopping Cart] [Privacy Statement]
 [Contact Us] [About Us] [Shipping] [Map to our Location] [Careers]

Copyright © Pelican Parts Inc.

Page last updated: Mon 12/5/2016 02:57:13 AM