The message to which you are about to reply is shown first. GO TO REPLY FORM



 VIEW    REPLY TO THIS MESSAGE    PRINT   SAVE 

Heater Core Noise 900 1994

posted by  Townshend Act on  Tue Jan 31 03:59 CST 2017
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
last visit: Tue Oct 7 22:44 CST 2014
[RELATED]

Each time I start the engine when it's cold or cool, I hear my coolant making a cavitation sound from the heater core. This is caused by air being trapped in the core, and the noise stops after I drive the car a few miles.
I have checked my heater hose orientation, replaced all hoses, the heater coolant valve and engine thermostat. There is NO loss of coolant whatsoever and the heater core is OEM and not leaking.
The heater coolant valve vacuum function is correct, and the heater puts out the proper amount of heat. After the engine has been run to speed, the cavitation sound is no longer heard.
My question is where might this trapped "air" be coming from (head gasket issue?), and what is an effective way of bleeding it from the cooling system.






USERNAME
Use "claim to be" below if you don't want to log in.
PASSWORD
I don't have an account. Sign me up.
CLAIM TO BE
Use only if you don't want to login (post anonymously).
ENTER CAPTCHA CODE
This is required for posting anonymously.
OPTIONS notify by email
Available only to user accounts.
SUBJECT
MODEL/YEAR
MESSAGE

DICTIONARY
LABEL(S) +
IMAGE URL *
[IMAGE LIBRARY (UPLOAD/SELECT)]

* = Field is optional.

+ = Enter space delimited labels for this post. An example entry: 240 muffler


©Jarrod Stenberg 1997-2022. All material except where indicated.


All participants agree to these terms.

Brickboard.com is not affiliated with nor sponsored by AB Volvo, Volvo Car Corporation, Volvo Cars of North America, Inc. or Ford Motor Company. Brickboard.com is a Volvo owner/enthusiast site, similar to a club, and does not intend to pose as an official Volvo site. The official Volvo site can be found here.