Question about 1989 Chevrolet S-10 Blazer

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1989 S10 Blazer air conditioning problem

My air conditioner works but it only shoots air out the top and floor vents. It doesn't shoot air out of the vents on the dashboard. It also does that for the heater too. If anyone can help me with this problem I thank you.

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The problem lies in the temp control selector, the knobs on your dash, that can go bad causing the dampers not to close, i would stop by a junkyard and pick one up, this is more than likely the problem.

Posted on Jul 03, 2009

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1998 Chevy S10 pickup air condition compres is on instead of heat


First be sure that you do not have the controls set to defrost the windows since on just about all vehicles nowadays with the controls set that way the air conditioner will be turned on...even if it is not so warm outside. So...be sure that you do not have any of the controls set to defrost and that the heater is turned all the way on.

It sounds like though that the control for the vents is not operating properly. This is a combination of mechanical movements of the vent flaps and small "air motors" that operate the flaps. These air units are controlled by air vacuum taken from the engine compartment through tiny hoses. If the hoses get cracks, holes or come loose from their fittings then your vents will not move correctly so it is a matter of looking and tracing each one of the hoses to make sure they are fastened correctly, have not come loose and are not cracked or leaking. The problem can even be in the engine compartment where the hose(s) connect to the engine vacuum system...so it will take lots of looking carefully with flashlights etc....good luck.

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How to trouble shoot air condition compresuer


You really want to troubleshoot your AC. Here are some items to follow:
1- Make sure your Compressor clutch work first. You can jump the wire to test it when the engine is off.
When you know the clutch work then you can look for the other things not makeing it activated.
2- It it doesn't work then you know the problem right there.
3- If it works then check the Low and high pressure according to compressor spec.
3- Check your engine temperature sensor. Don't think that your temp reading gauge is coorect then your engine temperature for your AC is working.
4- Check your compressor sensor speed. It has to be in sych with your crankshaft sensor before it allows the clutch engaged to prevent burning your compressor when it is locked up is in freezing mode ( ex.in case some clever people jumping wire to control the clutch bypassing all other rerquirement).
5- If you think these items need to be addressed by professional better then do-it yourself then I have no objection. Good luck on trying.

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Air conditioner vents only work on the floor vents.


being that it a dodge product they probably have used a vacuum based motor to switch where the air comes from. If this is the case then you must have leak somewhere. These are not easy to find they can take a lot of time or be quick it depends on the leak. to clarify does the heat or vent come out the top? is it supposed to?

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i would say its in the dash unfortunately you will have to pull it out to inspect.

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