Anyone have information on AC?


Old 11-08-07, 06:49 PM
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Anyone have information on AC?

I have a 1987 Chevy S-10 Blazer and my AC doesnt work. Does anyone know what I have to do in order to pinpoint exactly which part of the AC is not working?
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Old 11-08-07, 07:27 PM
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That covers a lot of ground. The most common cause is "low on refrigerant".

Is your compressor engaging when you turn on the AC switch and the interior fan? If not, think first in terms of not enough refrigerant to throw the pressure switch, which activates the compressor clutch and starts the AC cycling process. If low, you would have leak in the system that needs attention.

If the compressor is "kicking on", but you have a compromised cooling, you can still be low on refrigerant and that would need to be checked and brought up to level. Or you may have a loose belt on the compressor.

If everything is turning on and running properly with the right amount of everything, check the condenser for air flow obstructions. Air movement through the condenser is part of the cooling process.

Those are a few of the things that can cause a problem.

Hope this helps,

Old 11-08-07, 07:36 PM
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I dont think its the belt because i put a brand new one on in the past year. When I flip the switch absolutely nothing turns on inside the vehicle.
Old 11-09-07, 04:21 AM
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OK.... Do you have heat? Does the blower fan inside your truck come on and operate in the different speed ranges? It sounds like you have a blower fan issue at this point. It doesnt matter how good your A/C or cooling system is if the fan isnt working. It could be the blower motor or the resistor.
Hope this helps ya,
Old 11-09-07, 06:04 AM
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The first step for diagnosis is to hook up manifold gauges and measure the pressure in the system. Static pressure should be at least 40 psi.
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