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



 VIEW    REPLY TO THIS MESSAGE    PRINT   SAVE 

HVAC 700

posted by  someone claiming to be Don on  Thu Jun 19 02:42 CST 2003 [RELATED]

The ventilation system on my '90 745 Turbo is being interrupted by the swings in manifold pressure between vacuum and boost. When the engine goes into boost, the ventilation or air conditioning stops until the engine returns to vacuum. I have dismantled the passenger side of the dashboard and noticed what appears to be a number of small, coloured vacuum hoses. These hoses are similar in diameter to the electrical wires and are integrated into the wiring harnesses for the heater system. Does anyone know where the HVAC system receives vacuum from? I have poured over the engine compartment and can't seem to find any vacuum lines that might be feeding the HVAC system. Also, does anyone know if there is some sort of check valve that prevents boost from being sent into the HVAC vacuum control system? Thanks in advance for any comments.






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.