How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Cat Man Your Own Question
Cat Man
Cat Man, Caterpillar Engine Expert
Category: Heavy Equipment
Satisfied Customers: 8917
Experience:  23 Years Caterpillar Engine experience.
Type Your Heavy Equipment Question Here...
Cat Man is online now
A new question is answered every 9 seconds

Why is my c13 cat blowing antifreeze out the rad overflow?

This answer was rated:

Why is my c13 cat blowing antifreeze out the rad overflow?

Hi. Thanks for using JA! I will try and help you out.


There are 2 things that I have seen cause antifreeze be pushed out of the radiator over flow.


The first is a failed head gasket. When the head gasket fails, compression from one of the cylinders will put compression into the cooling system. When this happens, you will see antifreeze come out of the over flow.


Second is a failed Jacket Water Pre Cooler. Also known as a JWPC. The JWPC is located after the turbos and before the air to air cooler on the front of the engine. It has antifreeze in it to cool the compressed air that comes out of the turbos. The JWPC can crack, when this happens, boost pressure will go into the JWPC and cause coolant to be pushed out. To confirm, you can remove the JWPC and look for evidence of antifreeze. If the JWPC is cracked, antifreeze will leak back into the piing and JWPC. If you see no evidence of antifreeze, your engine most likely has a failed head gasket.


Please reply back if you need more help or have more questions. I am happy to assist.

Cat Man and other Heavy Equipment Specialists are ready to help you