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No heat or air. It was all working fine then went out one day but at times when I hit a bump it would come on till I turned the car off now it's all out. I already checked the ground any ideas?

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  • Cars & Trucks Master
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Could be any of the connections in the system, the blower resistor, or even the blower motor.

Posted on Jul 23, 2013

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Posted on Jan 02, 2017

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SOURCE: 1992 acura legend very weird problems

This particular model suffers with head gasket problems. I have had to replace head gaskets on several of these vehicles to solve the overheating problem. The two cylinders in the rear of the engine are the problematic ones. The head gasket goes bad in that area which sends combustion gas into the cooling system. This then creates air pockets which in turn causes the engine to run hot. The air pockets then shift and as water starts to circulate again, the temperature goes back down. This cycle repeats over and over.
Solution is to replace the head gaskets.

Posted on May 25, 2008

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SOURCE: 1995 lincoln town car Rear air suspension problem

probably a leak in the system. check the switch in the trunk, make sure it is on.

Posted on Jan 10, 2009

emissionwiz
  • 76846 Answers

SOURCE: My car heater works fine

this problem is most commonly caused by either a sticky air temp control blend door or a defective blend door electric actuator, this door controls the air temp at the heater/AC oulets.

Posted on Jan 14, 2009

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SOURCE: Blower fan goes off with hitting a bump

Check to see if any of the wire connections are loose.

Neil

Posted on Mar 15, 2009

saabreur
  • 51 Answers

SOURCE: I have a 93 Saab and my vents aren't blowing heat.

You don't say whether the fan starts and shuts off with the bumps, or the heat goes cold but the fan stays on. If it's the fan shutting off and coming back, you most likely have an intermittent connection to the blower motor somewhere at the fuse box, the fan speed control switch or the fan motor, or a loose ground connection at the fan motor. The fan motor is visible under the right side speaker grille on the dash. Make sure you re-connect the short black corrugated hose to the grill vent or you won't have defrosting on that side!

The air distribution rotary switch controls where the air goes. The fan speed switch controls exactly that: fan speed. the temp rotary switch controls the coolant temp into the heater core. You need to clarify what you mean by "Also, the dash controls for the vents won't allow me to turn up the power"

You might also have one or more of the following issues:

  1. is you vacuum tank properly connected and are there no leaks in the vacuum piping? The tank is in the driver side rear wheel well below the trunk deck on a convertible, and in the passenger side front fender area on the other cars. It's a white bottle with one or two hoses connected to it. If not properly on, your vacuum operated heater flaps won't move. Does the air distribution knob make sucking or hissing noises when you set it to different positions? If not, check the tank connections, look for vacuum line leaks, then suspect the vacuum valve behind the distribution knob.
  2. if the air distribution rotary switch makes noises when you change its setting, but nothing happens, then suspect the vacuum solenoids that open and close the heater flaps - could be a loose vacuum line or a defective vacuum solenoid
  3. the shaft connecting the temp control knob to the heater valve behind it may not be properly in place. This can be inspected, and adjusted if necessary, from the left side speaker/vent cutout on top of the dash. Make sure you re-connect the black flex hose to the air vent tube, or you'll get no defrosting afterwards!
  4. remember, the centre vents always blow cold air; a brilliant idea from Saab so the driver (and passenger) can get fresh air in the face and stay awake while the rest of the driver, passenger and car is toasty!

Posted on Mar 01, 2010

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1 Answer

My heat only works sometimes. One time I will start it and it will come right on, the next time it wont. If I hit a bump it will sometimes come on till I shut the car off again. Any ideas?


When you say heat only works sometimes are you talking the blower fan only running once in a while if it is the fan your talking about it sounds like a loose connection either on the switch or possibly on the blower mother itself

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typically, you can remove some pockets of air in the system by setting the interior heat setting to maximum. This allows the coolant in the heater matrix and pipes, to circulate out, along with any pockets of air.

But I'm not sure air pockets are your problem. It especially sounds strange than you mention the heat coming on after a bump.
Are you sure your interior blower motor is working? Have you checked to see if there is air coming out from your blower vents in and under the dash?
If not, then please check your blower motor's connections and operation. If it is only working after a bump, then it could have suffered wear to the inner motor. In which case it may require replacement.

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Based on your description I would say you have a blend door that is sticking or the control motor is going bad. The blend doors control air flow.

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6_22_2012_8_53_21_am.jpg

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My car heater works fine sometimes and other times no heat comes out until I hit a bump in the road and it works.


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