Question about 1999 Volvo S70

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99 S70 2.4 55 ENGINE CODE

LOOKING FOR VACUUM LINE OFF AIR BOX

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FINALLY Vacuum Hose Diagram

Posted on Mar 29, 2014

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Posted on Jan 02, 2017

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What would cause there to be no air to be coming out the front panel on a 99 Ford F-150?


If your mode controller works for other options but not for front vents, the likely problem is a failure of the door actucator or linkage. If the mode seems to be stuck in defrost mode, the likely problem is a vacuum leak. The mode control runs on vacuum supplied from the engine intake manifold througn a thin plastic line. The mode switch puts the vacuum to different doors in the heater box to redirect the airflow. Each door is operated by a vacuum actuator. If the supply hose or actuator diaphragm leaks, that door will not operate. If the supply line from the engine or the switch itself leaks, none of the doors will operate and the mode defaults to defrost.

Mar 18, 2012 | 1999 Ford F150 Regular Cab

1 Answer

We have a 1997 Dodge Intrepid. Heater, defroster blows ice cold air. Where is the vacuum line to open and close the warm air, cold air door in the heater system? It seems to be drawing cold air from the...


The Intrepid doesn't have a vacuum line. It uses a electric motor called a "blend door actuator". It's located on the underside of the heater box near the center of the car.

Jun 14, 2017 | 1997 Dodge Intrepid

2 Answers

Air conditioner will only blow air out the defroster vents.


Defrost is the default when the controller is not receiving vacuum from the intake manifold. Look for the small vacuum line going from the engine intake manifold to the firewall and trace it to the control switch. If the vacuum line looks OK, try to pull the vacuum connection from the control switch. Then start the car and see if there is vacuum coming to the connector from the line that you traced from the engine. If no vacuum, the line has a leak--retrace to the manifold. If there is vacuum, your switch is probably leaking. You can buy a new vacuum switch from Ford or some parts stores. More questions, please let me know.

Sep 09, 2010 | 2004 Ford Crown Victoria

3 Answers

89 chevy S-10 with 2.5L engine misfiring, when I ran the diagnostic test it showed code 25 or two flashes pause five flashes, what's the problem


Intake air temperature sensor or circuit shorted. Look for sensor popped in on intake hose from air filter. If not connected or wires broken find & repair connection or sensor is bad. Replace.

Jun 06, 2010 | 1988 Chevrolet S-10

1 Answer

Get engine air filter out and install new.


Step 1 Unfasten wire harness to MAF (massive air flow) sensor located on top of the black tube leading from the air box to the plenum.
  • Step 2 Unplug the vacuum line located on top of the black tube. This simply pops in and out so you might need to be forceful, but apply common sense since it's a plastic vacuum line.
  • Step 3 Loosen band clamp with the screw driver at the top of the black tube that is attached to the aluminum air chamber that run to the plenum. Also, loosen the other band clamp located at the bottom of the tube closest to the air box. The idea is to remove this tube with the MAF sensor intact in between. Do not remove the band clamps, simply loosen them enough to wiggle off the tube and move it out of the way.
  • Step 4 Unclip both fasteners at the top of the air box and pull out and up to remove air box cover. Remove old air filtermag-glass_10x10.gif and if there's a good deal of dust and debris inside the air box, you could wipe it out with a rag or even vacuum it out with a shop vacuum.
  • Step 5 Insert new filter and replace air box cover. Make sure the retaining tabs are locked in at the bottom correctly. Refasten top locking clips to air box cover.
  • Step 6 Reinstall air tube making sure to replace top part back on correctly to aluminum air chamber. Not properly reinstalling this air tube will result in the computer of the car throwing a check engine code. On the bottom of the black air tube is a small tab and if tube is replaced properly should line up in a notch molded into the air box cover. Tighten band clamps with screw driver and reconnect wire harness and plug plastic vacuum line back in.
  • Mar 15, 2010 | 2002 Buick Rendezvous

    1 Answer

    How do you remove the cover to replace the air filter?


    1. Unfasten wire harness to MAF (massive air flow) sensor located on top of the black tube leading from the air box to the plenum.
    2. Unplug the vacuum line located on top of the black tube. This simply pops in and out so you might need to be forceful, but apply common sense since it's a plastic vacuum line.
    3. Loosen band clamp with a screw driver at the top of the black tube that is attached to the aluminum air chamber that run to the plenum. Also, loosen the other band clamp located at the bottom of the tube closest to the air box. The idea is to remove this tube with the MAF sensor intact in between. Do not remove the band clamps, simply loosen them enough to wiggle off the tube and move it out of the way.
    4. Unclip both fasteners at the top of the air box and pull out and up to remove air box cover. Remove old air filter and if there's a good deal of dust and debris inside the air box, you could wipe it out with a rag or even vacuum it out with a shop vacuum.
    5. Insert new filter and replace air box cover. Make sure the retaining tabs are locked in at the bottom correctly. Refasten top locking clips to air box cover.
    6. Reinstall air tube making sure to replace top part back on correctly to aluminum air chamber. Not properly reinstalling this air tube will result in the computer of the car throwing a check engine code. On the bottom of the black air tube is a small tab and if tube is replaced properly should line up in a notch molded into the air box cover. Tighten band clamps with screw driver and reconnect wire harness and plug plastic vacuum line back in.

    Oct 27, 2009 | 2003 Buick Rendezvous

    3 Answers

    99 RX300 Engine code keeps coming up lean


    Check for vacuum leaks. ie, vacuum lines them selves, the rubber tube that runs from the air filter to the throttle body. If it has a plastic intake manifold, possibly the rubber port seal gaskets between it and the engine. Lean codes are set when the PCM isn't monitoring all the air coming into the engine (vac leak) or low fuel pressure.

    Jun 24, 2009 | 2001 Lexus RX 300

    1 Answer

    P0411 code 99 Passat


    The secondary Air Injection system, this is basically an inspect and replace broken hose detail. Leave the inlet hose disconnected and start the engine. Listen and feel for exhaust hissing at the check valves.The check valve(s) will make like a gurgling sound as air is drawn in However , if exhaust is felt or heard replace the valve. Hope this works out for ya.

    Jun 10, 2009 | 1999 Volkswagen Passat

    1 Answer

    I have a 99 jeep cherokee no hot air?


    Does the air come out from the defroster? If you hear the blower motor and don't get any air from the panel, the car may have a vacuum line either off or broken under the hood. Check under the hood by the pass. side firewall and see if the vacuum line going through the firewall is off. Listen for a hissing sound around the area when the engine is running. There is a vacuum canister in the front bumper on the right side, it could be cracked.

    Jan 21, 2009 | 1999 Jeep Grand Cherokee

    2 Answers

    '99 Astro blower doors not moving to allow air flow.


    I had the same problem...

    There is a vacuum line that operates your selector switch, it is located under the hood, roughly in the center, up against the fire wall. If the line has leaks, your selector switch will not work and therefore all your blower doors will stay shut. Replace the line.

    Nov 01, 2008 | 1999 Chevrolet Astro

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