Question about 1995 Volvo 940

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I have a 1995 volvo 940 with a vaccum leaqk problem when u excelerate the air conditionong blows in the floor board not from dash i have a vaccum tester but what do i test? i checked all vaccum lines on back side of switches and yellow line didnt hold vaccum does that have something 2 do with it?

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  • 65 Answers

Welcome to the club :). This is a common issue. A lot of people thought it was just the pressure valve under the hood, but they have had limited success. If I figure it out, I'll let you know, and if you do, be sure to let me know. Thanks.

Posted on Dec 11, 2011

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Posted on Jan 02, 2017

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2 Answers

When I excelerate my ventilation panel inside the cab starts blowing air out of the floor vent instead of blowing out of the front panel.


there is a vacuum can under the hood and if that is not hooked up or has a leak there is no vacuum reserve for the vent control valves so they go bad to a fail safe position

Aug 11, 2012 | 1990 Dodge Dakota

1 Answer

All of a sudden my engine is revving when in park (1995 Volvo 940)


How high do the RPMs go up? It could and usually is your idle air control valve(IAC). In the 940, it is not bolted into the intake, rather it bolted elsewhere underneath the intake and two rubber vacuum hoses connect it to the engine intake. If these hoses are ruptured, the your engine will rev up at idle. Also it could just be the IAC itself malfunctioning.

Dec 08, 2010 | 1995 Volvo 940

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The dash air vents on my 1995 Buick LaSabre do not seem to be blowing any air. Air flows only from the windshield and the floor. What could it be?


The distribution of the air flow works off a blend door which is operated by a motor. The motor is faulty or the mode switch in the control head were you set the mode settings is at fault

Apr 03, 2010 | 1995 Buick LeSabre

1 Answer

I have a 95 eagle talon 2.0L 5 speed. heater problems


You may have a vaccume leak that is keeping your duct doors open in the center of its travel. If you have knobs you may have a broken control cable. See if you hear a hissing noise behind the dash. That will get you moving in the right direction. Wish you luck!

Jan 05, 2010 | 1995 Eagle Talon

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Back pressure in overflow tank, volvo 940 1995 i don't think its h/gasket or air lock


better take it to a mechanic, I have never heard of excessive pressure in cooling system not being a head gasket. It always is.

Oct 14, 2009 | 1995 Volvo 940

1 Answer

Air condition 93/940


I HAVE REMOVED TEMP CONTROLL UNIT FROM DASH,TESTED CIRQUIT BOARD AND FOUND
ONE SOLDER SEPARATED FROM BOARD AT THE SMALL RELAY'S LEG. PUT IT BACK TOGETHER AND NOW IT WORKS LIKE A CHARM. REMOVING THE CONTROLL UNIT WAS THE MOST DIFICULT JOB TO DO.LOTS OF THINGS TO REMOVE,LOTS OF SCREWS AND SHARP EDGES.IT IS DONE.

Oct 12, 2008 | 1993 Volvo 940

1 Answer

A/c blows cold then goes to hot air


sounds like a vaccum diaphram may be leaking try listening for hissing noises under dash near the glove box,set blower to lowest setting\off if you can and still have a\c on.

Oct 07, 2008 | 1995 Volvo 850

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