Learn how to bleed the cooling system

1. Bleeding the
Cooling
System

2. Bleeding the
Cooling
System
A bleed valve is sometimes
provided
Cars with low hood lines require a
bleed screw to empty air pockets
Trapped air can cause overheating
or damage from hot spots (buildup
of heat)

3. Bleeding the
Cooling
System
Remove Never remove a cooling system bleed screw or
any clamp on a hot, pressurized system
Crack Crack open the bleed screw until all air is
purged from the system
Start and
warm
Start and warm the engine
Fill Fill the system

4. Bleeding the Cooling System
• Crack open the bleed screw
until all air is purged from
the system

5. Bleeding the
Cooling System
DaimlerChrysler recommends that the
bleeder valve be opened whenever refilling
the cooling system.

6. Bleeding the Cooling
System
DaimlerChrysler also recommends that a clear
plastic hose (1/4” ID) be attached to the
bleeder valve and directed into a suitable
container to keep from spilling coolant onto the
ground and on the engine and to allow the
technician to observe the flow of coolant for
any remaining oil bubbles.

7. REFERENCE
• Duffy. E. J., (2004) Modern Automotive Technology (6 e.d.).
Goodheart-Willcox Co.
• Halderman. D. J., (2012) Automotive Technology: Principles, Diagnosis
and Service (4th e.d.). Pearson Education, Inc.,