Question about 1992 Volvo 940

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The a/c on our 94 940 wagon blows fine when I am not accelerating, but when I depress the accelerator I loose air coming through the vents and when I let up it flows strong once again

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2 way vacuum servo under dash, very difficult to replace, suggest dealer install, about $300, lots of labor, part $50.

Posted on Aug 28, 2008

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My 2003 Jeep Liberty heater is blowing cold air when idling. Warms up when you hit the accelerator. I also hear a water rolling sound upon take off after idling. Water pump? Heater Core?


Water level perhaps. When you hit the accelerator the water volume increases. Check your water level and make sure that your thermostat is opening and closing properly. Water level I'm thinking

Jan 21, 2011 | 2003 Jeep Liberty

1 Answer

Air stops blowing through the vents when accelerating


u have a loss of vacuum to the ac mode control switch, this switch applies vacuum to diff vacuum motors to move air to diff outlets, dash, floor, defrost etc. either the vacuum line or vacuum resivior at the engine is leaking or the mode control is leaking vacuum.

Aug 14, 2009 | 2003 Lincoln Navigator

1 Answer

Acceleration no air, foot off gas air barely blows out vents


The vent is controlled by vacuum. Check the condition of the vacuum hose associated with the vent control. What is happening is when you decelerate, the intake manifold vacuum increases, and a diaphram is slightly pulled giving you air in the vent but very little. In normal condition the diaphram wont even pull. Solution is check for a vacuum leak in the vent control trace it coming from the intake manifold.

Jun 30, 2009 | 2000 Chevrolet Lumina

1 Answer

Press the accelerator and it changes where the AC air comes out.


I don't suppose you have a vacuum gauge you could "T" into line after check valve somewhere to see if vacuum present while accelerating? How hard is it to pull controls out to see back of them, and locate vacuum feed line?

Jun 11, 2009 | 1999 Dodge Durango

1 Answer

Air conditioning blows out defrost when accelerator is depressed


You need to open the vent, under the dash. Check the cable and moving action assembly. Make sure that it is all moving correctly. Some of the newer hvac systems in cars work off of vacume but most work with cables. Not big long cables, just small lever cables. also check your seals and make sure none of them are broken. I often find this is a bigger probel, the seal is cracked or broken or just came off and needs to be re glued in place. Don't be afraid to take the vent tubes apart as long as you can remember where they go.

May 31, 2009 | 1996 Ford Thunderbird LX

2 Answers

A/C blower stops blowing air on acceleration


you have a vaccum leak some where on the engine start the car up open the hood a listen you may be able to the leak it will make a hissing noise

May 29, 2009 | 2000 Ford Taurus

1 Answer

Air won't blow through dash vents under acceleration


there should be a vacuum line running by the drivrs side shock tower that might be unhook are cracked

Apr 08, 2009 | 1994 Oldsmobile Cutlass Supreme

1 Answer

Auto climate controll only blows through defrost & floor,not the


it either has a vacuum line on the back of the unit off or the control unit is bad

Mar 19, 2009 | 2005 Ford Crown Victoria

2 Answers

My volvo 240 DL Station Wagon (a 1987) idles high, and there is a frequent delay in acceleration when I press the gas. These issues MAY be unrelated to one another, as my car has well over 200k miles on...


I tink you have to replace the catalyst for better acceleration probably is blocking the combustion that's what you loosing power, I have 240 wagon 92 and i just did it. my 184k miles good luck.

Aug 11, 2008 | 1990 Volvo 240

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