Where is the vacuum valve on a Volvo 940?
Leaks at any connections can cause driveability problems, especially at low RPM or at idle. The IACV itself may also need to be cleaned or replaced. The valve itself is located underneath the intake manifold. Below is an IACV for a Volvo 940: As noted by the orange line, this is the actuator and vacuum line for cruise control.
Why does my Volvo 940 have a leak?
The flexible intake tube itself may also leak along the joints. The Volvo 940 has a thermostat just before the intake box which is normally open in warm weather. In cold weather, the valve closes and intake air is routed past the exhaust manifold in order to warm it up.
How to fix a vacuum leak in a Volvo?
Just ensure the silver heater tube is connected at both ends and that the thermostat valve operates normally. Only in cold weather will the valve be shut (below 10-15C), but otherwise the valve should always be open.
How to test for a fault in a Volvo 850?
CODE TESTING for fault code diagnosis. 1) Disconnect diagnostic unit “A”. Turn ignition on. Check for voltage at diagnostic connector terminal No. 4. If voltage is not present, check fuse and wiring. If voltage is present, turn ignition off. No. 8 and ground. Ohmmeter should indicate approximately zero ohms.
Where is the fan control knob on a Volvo 960?
Fan speed can also be manually controlled by placing control knob in any position except AUT or 0 (off) position. Function selector knob may be placed in defrost, vent, AUT, bi-level, or floor position. In AUT position, air distribution is automatically regulated. Air distribution may also be to floor, windshield and side windows.
Where is the vacuum hose on a Volvo?
Leaking Sound from Under Dash. That vacuum leak is almost certainly your floor/defrost diaphragm. It is on the left side of case just above the accelerator pedal. This diaphragm unit is double acting, i.e. it has vacuum to pull it both ways, blue hose for defrost and yellow for floor.
What does a vacuum leak on a Volvo mean?
As noted by the orange line, this is the actuator and vacuum line for cruise control. This system uses vacuum to operate, but uses its own pump to create vacuum as opposed to using engine vacuum. Any leaks in this system would only affect cruise control operation. The actuator looks like this: