Question about 1987 Saab 900

1 Answer

I'm having a problem with my front deroster. it seems that when it rains my windows will not clear up. If I turn the heater control knob on defroster It will not blow anything out of the vents for the defroster to work. It seems that it only blows out from the face and feet area. Do you know what the problem could be.

Posted by on

1 Answer

  • Level 1:

    An expert who has achieved level 1.


    An expert that hasĀ over 10 points.


    An expert whose answer gotĀ voted for 2 times.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 19 Answers

The vent actuators are vacuum controlled on this model. Do you hear a hissing sound when you turn the control knob? If not, then you'll need to check the pipe or hose connections. Start with the vacuum reservoir bottle on the right hand wing just in front of the door. Ther'll be a hose from the inlet manifold to the bottle, make sure that's connected & air tight. The other pipe from the bottle goes to the heater controls. Has the radio been removed or any work done in that area? If all appears fine, remove the radio & make sure the large white, multi-hosed connector is fitted securely to the control switch & all the pipes are connected to it.
Good luck, let me know if you need any further help.

Posted on Sep 03, 2008

1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Why is heater defrost vents not working ?

Depending on the vehicle, it could be a vent door actuator

Aug 24, 2014 | Cars & Trucks

1 Answer

87 suzuki samurai ac only blows cold when it rains

Is the dash controls set in heat + defrost mode?
A/C only mode ( <<<<I will guess this)
you are lucky A'/C works after 27 years.. for sure.

that is an all time first. rains.
what is the outdoor temperatures?, one thing i cant guess.
what is your question, the above is a statement.
and can be true, heater off, A/C on. on any car. controls wrong.

I will try to rephrase it.
I'ts hot, outside and my A/C fails. not moving.
and seems to work a bit, when raining.
and works ok moving fast. why?
Checks (basic)
  1. A/C test. turn A/C only, on and recirc. mode.
  2. Does the cab fan blow hard? y/n
  3. Then see if the compressor clutch is engaged. (hood up)
  4. if engaged. see if front fan is on, fast running, if not, that important function is failing, more tests, ask.

RAIN issues.
fan in front of the A/C condenser failed?
if the front fan fails , the A/C will be weak, , not moving fast (car)
and will work better in rain, because the rain cools the condenser partially hiding the fact that front fan is DEAD.

that fan , to find it, look in the front grill. see it. that black fan
id bet it's dead'. (that dont mean it bad; per ce'.) it can be the relay
that drives it , that's bad, or the wires connecting either bad.
as we say 1s things, first the glance at the fan ,then more tests

if all this is greek, get the car serviced.

May 07, 2014 | 1987 Suzuki Samurai

1 Answer

Fogging windows

Heater radiator leak.It is under the windscreen and can blow hot water (vapor) to the glass.Does it slightly smells heated water?Very rare:rain water in the saim compartment as the heater having the same simptoms.Track the problem,ceck coolant level regularly.Cheers,hope u deal it,let others know.

Oct 26, 2013 | Jeep Cars & Trucks

1 Answer

My 2001 malibu windows fog up all the time .Anyone know where to check for proper ventalation?

Make sure the ventilation is set to "fresh air", and not "recirculate" . There should be a button just below the heat control that shows the air flow. One has an arrow going straight in to the little car picture, and one shows the arrows in a circular motion. Set it to the straight one, the "fresh air". Fresh air is drier and your windows will dry quicker. There is always moisture in your car from snow and slush and rain and it takes forever to dry out.
The only other thing it could be is a cracked heater core, and if it was that you would smell antifreeze when ever theheater was on.

Feb 06, 2012 | 2001 Chevrolet Malibu

1 Answer

Heater and defroste zone control does not work

This is going to be a default position the computer selects for the hvac system after a repair has been performed, or a diagnostic trouble code for the hvac has been logged. You will need to contact Jeep and find out what it takes to clear the code. That information is normally free.

Jan 04, 2010 | 2000 Jeep Grand Cherokee

2 Answers

How do I keep my car windows from getting foggy?

on your heater control you should have a selection button for outside air or recurlate this is useley a arow curcle or strate the strate arow is the one you need to use

Dec 31, 2009 | 1998 Honda Civic

1 Answer

Heater works ok but wont send air thru defrost vents

check the control knob it may appear to be working but is not turning the actual controller

Jan 01, 2009 | 1995 Pontiac Grand Am

Not finding what you are looking for?
Cars & Trucks Logo

308 people viewed this question

Ask a Question

Usually answered in minutes!

Top Saab Experts

Colin Stickland
Colin Stickland

Level 3 Expert

22082 Answers


Level 3 Expert

71694 Answers


Level 2 Expert

166 Answers

Are you a Saab Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides