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

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Have a 2000 Lumina. Air vents do not blow air when accelerating. When you let up on the gas it will blow, but not as much as it normally does. When driving it tends to come and go. The defrost and floor...

Sounds like you have trash/debris in the vents or your A/C evaporator is clogged with dirt.
Clean everything out and it should be okay. While doing that check for loose parts like flapper doors etc.
A vacuum cleaner with a flex rubber snouts helps.

Oct 24, 2017 | Chevrolet Lumina Cars & Trucks

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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

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