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



 VIEW    REPLY TO THIS MESSAGE    PRINT   SAVE 

Engine over cooling 700 85

posted by  someone claiming to be Hakan Carlsson on  Thu Nov 9 02:57 CST 2000 [RELATED]

I have an 85 740 turbo automatic. When the car is warming up, the temp gauge is moving up towards the middle as is expected, but passes the middle slightly (somewhere between 1/2 and 3/4), and then falling (assuming the thermostat opens) to about 1/3. Is this normal? The temp then starts to climb again to 1/2 and the cycle continues over and over, however it seems to cycle more slowly. After the car should be fully warmed up (after 10-15 minutes of driving and more), the temp gauge is still moving between 1/3 and 1/2 but never seems to settle on 1/2. This cycling and the fact that the temp gauge never settles on 1/2, seems abnormal to me. I did replace the thermostat about a year and a half ago with a Volvo original thermostat. I have had some overheating problems before and after the thermostat was replaced, but finally I figured out that the fan clutch was not working properly and was the culprit to the overheating, so the fan clutch was replaced. The car never boiled over, but was just running too warm at around 3/4. Since then the overheating has stopped, but now the car is overcooling. My plan is to replace the thermostat again, since the overheating may have damaged the thermostat (just to eliminate the possibility that the thermostat is the problem). My question is if there is anything else that may cause the problems I'm seeing. Other than the thermostat is there anything that can cause overcooling? What about the heater? I know there is a vacuum operated heater valve on the coolant hose going to the heater. If this valve is stuck open, will this cause overcooling (heater acting as a second radiator)? If this is the case how can I check that the valve is working properly? What about the temp gauge or the temp sensor? How can I verify that these are working properly? The temp gauge is not moving erratically, so I don’t think this is the problem, but you never know. Is there anything I have forgotten, that I need to look at?

Any suggestions for how to solve my car’s cooling problem are appreciated. Thanks.





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.