Question about 1988 Volvo 740

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No air coming through vents and blower is OK

1988 Volvo 740T wagon:
When I turn on the blower fan for heat or air, I can hear the blower motor spinning but there is no (or very little) air coming through the vents.
Relay? Vacuum line?
Thanks

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  • Anonymous Oct 22, 2008

    no fan running blows fuses

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  • 22 Answers

Your blower motor might be damaged.replace the blower motor of the air con.

Posted on Aug 20, 2008

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I had a very similar problem on a Buick recently. Like mine, your blower's fan blade assembly may have come loose from the motor shaft. There is a very small washer type clip that holds the fan blade part to the motor's shaft. Usually the whole blower assembly is pretty easy to get to and take off...usually. A lot of GM cars had the assembly accessed from the firewall behind the engine. You would need to pull the blower motor out and check the fan assembly.

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there is a problem with the fan circuit which includes wiring fuse (you stated were ok) and Fan speed switch (might be a module)

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wow...here it is spring and no one answered either of you? Is there a large volume of air when fan is on high? Where is it going? Or do you not hear anything from the fan? The 240 has an awesome heater. On high it would heat a small home! If no sound, your blower motor is dead assuming the fuse is good. If you hear the fan blowing, figure out where the air IS going. Note that the only way to turn the dash vents off is with the white Oreo dials. To defrost, only that button should be pressed in and dash vents off. Behind the dash switches there is a maze of short vacuum hoses. Often times, people monkey w/ these and reconnect them incorrectly. Haynes manual or Chilton's have proper diagrams. It could be that the vacuum hose coming from the manifold and entering the firewall is split on the under side and not visible, also.

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