Quantcast
RWD - Can't Turn Off the Heat

Volvo RWD 900 Forum

INDEX FOR 9/2019(CURRENT) INDEX FOR 9/2004 900 INDEX [<<]  [>>]

 VIEW    REPLY TO THIS MESSAGE    PRINT   SAVE   A    A 

Can't Turn Off the Heat 900


'92 940 turbo wagon. Recently overhauled the cooling system. New water pump, radiator, t-stat, hoses. Replaced the heater control valve first. Everything is connected correctly. The heat won't shut off. The control valve is working properly, lever in correct position so vacuum is not the issue. The entire A/C system has been removed including condenser. The heat continues even with one of the heater core hoses manually clamped off. Blower motor is new and not contributing to the problem.

If the car is started and allowed to get up to full temp w/o moving it blows at ambient temp. Drive it and the heat increases incrementally until full temp.

The turbo creates enough heat to make the passenger side firewall pretty warm. Could this heat move by conduction into the heater core? Since this problem existed prior to the above maintenance and was the reason for changing the heater valve that seems implausible.

This is no big deal in the winter but in the warmer months it makes the car almost undriveable.

Theories?






THREADED THREADED EXPANDED FLAT PRINT ALL
MESSAGES IN THIS THREAD

New Can't Turn Off the Heat [900]
posted by  passport2  on Sat Aug 31 14:50 CST 2019 >

Cut and paste link:

<< < > >>


Users marked in green are currently online.

©Jarrod Stenberg 1997-2016. All material except where indicated.


Brickboard.com is not affiliated with nor sponsored by AB Volvo, Volvo Car Corporation, Volvo Cars of North America, Inc. 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.

All participants agree to these terms.
Powered by Denizen - Custom Software for Enthusiasts