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1995 Chevy Astro van ac compressor doesnt kick in changed blower relay after it went out now compressor doesnt work checked fuses not problem?
Wiki User
∙ 14y ago
Could be one of a few problems on this, I'm taking this from the standpoint that nothing was working when this started. Given in the order I would try things. Pressure Test:
Key Off Engine Off. Put a set of gages on the AC connectors, make sure you have at least 75lb of pressure (both sides). If NO PRESSURE - you have a freon leak it needs to be fixed and the system recharged. If PRESSURE, look along the LOW SIDE lines for a T type connector and wires (two) coming out of it - this is the low pressure relay (they are not always in the same place so you just have to look - normally though they are almost in front of the blower). Once you find it, unplug it and get a paper clip that can bridge the two connectors. Start the van and turn on the AC MAX (including rear ac if you have it); make sure the blowers are running. Now put the paper clip across the two connectors and see if the compressor kicks in. Warning do not leave it in this state for more than 30 to 60 seconds, this is a test procedure not a bypass! Watch the gages and see if the pressure is reading normal (low side around 40lb). If the low side goes below 40lb's you are low on freon, pull the paper clip instantly! Leaving the system in this state for longer than advised, or allowing pressure to go below 35lbs could cause the system to rupture a hose (from evap freeze up). Have the system leak tested and recharged. IF the compressor kicks in then the low pressure relay needs to be replaced. This relay SHOULD have a schrader valve (the type valve used on a tire) meaning it will NOT leak when replaced (you will loose 'some' freon). IF the compressor does NOT kick in, then remove the clip and shut down the motor - Key Off, Engine Off (KOEO). Use a test probe from the positive battery terminal and find GROUND on the two wires going to the compressor. Once located use a jumper wire from the positive battery terminal to the OTHER wire on the compressor (do NOT unplug the wires, it still needs the ground to work), listen for a CLICK (and the front part of the compressor should compress or move IN) if this works then the problem is in the compressor relay or its related wiring, if it does NOT then the AC Clutch needs to be replaced - this requires special tools (Clutch puller, Freon Recovery) and goes beyond the scope of this answer. The AC Compressor Relay is located in the Under Hood Fuse Block - it is a 5 pin MINI relay (not one of the large ones) and SHOULD be marked. Local auto parts stores have location books and will help you find the relay in case it is not marked. Testing the AC Compressor relay and or the wiring for the AC system goes beyond the scope of this answer. Caveat Warnings! The operations, test procedures and instructions in this answer deal with things that COULD cause INJURY OR DEATH. Freon in its compressed state can cause 3rd degree chemical burns ON CONTACT / INSTANT BURNS - contact with your eyes WILL cause instant blindness. Working under the hood with the engine running is DANGEROUS, all caution should be taken. Working with electrical wiring could cause an electrical fire, or in the worse case, the battery to explode. IF you are not familiar with these operations, do not feel comfortable doing them, then contact a professional service person to carry out the work!
Wiki User
∙ 14y ago
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Ive changed the heater blower in your car it has heat but isn't blowing hard enough had the blower checked again its good and ive changed the heater setting panel in your 92 thunderbird?
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