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Old 06-27-2005, 07:54 AM
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short???

Wasn't sure where to put this, so if it needs moved...I apologize. Not really a hotrod question either but.....I took my S-10 pickup in to have the A/C looked at as it isn't blowing cold air. I was told there is a short somewhere in the system as it continually blows the 10 amp fuse. The compressor was disconnected and it still blows the fuse. Where would the most likely place be to look for a short in this system? The system is full of freon which was my first idea for a fix for no cold air, but I have no idea in regards to electrical. Any help would be appreciated.

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Old 06-27-2005, 09:42 AM
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What year S-10 and engine size? 2 or 4 wheel drive? center or column shift?

Steve
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Old 06-27-2005, 09:48 AM
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Sorry about that...it's a 2000 S-10, 4 cyl., 5 speed., 2wd. Thanks
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Old 06-27-2005, 11:25 AM
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I will try to get time to look up a wiring diagram for you truck may take a few hours.

Steve
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Old 06-27-2005, 11:34 AM
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Thanks for the help. I really appreciate it
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Old 06-27-2005, 02:41 PM
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If you have a multi-meter,set it to ohms,check for continuity between the relay and the compressor power feed.Unhook the relay wire and the feed wire. If it checks out ok,from there check for continuity from the relay ti the fuse block. The relays for them should be behind an access panel in the glove box.
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Old 06-27-2005, 06:47 PM
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A/c

Doc here,

Does the heater work OK? all the doors function and you have full speed control on the blower motor?

Pull the fuse at the fuse box, then pull the plug from the heater/AC switch and isolate The main power wire into the switch...measure with a volt ohm meter from there to ground, It should read infinite ohms...if it does not..find and fix the short..If not..

Unplug the Blower motor (or Speed controller board) Than plug the switch back in, and install the fuse, Turn the system on, If it blows the fuse, you have a short on an electrical door switch (if so equipped) or other circuit..If it does not, you have a short in the Blower Motor, or (if so equipped) the motor speed controller board.

Does this fuse blow RIGHT away, or does it take a minute or two...?
The Thermo Fuse IS NOT blowing? (the big 30 amper up on the compressor/engine area)Can you hear the Clutch engage?

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Old 06-28-2005, 06:45 AM
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Doc,

The heater works fine as does the fan speed and doors. When I turn the switch to A/C the engine rpm goes up like it is working but the compressor never engages. I'm pretty sure the 10A fuse blows immediately but will check further tonight. I have swapped relays with no change. I will do some of the other checks you mentioned tonight. thanks for the input
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Old 06-28-2005, 07:18 AM
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Sorry I can not get a pic of the diagram that is clear enough to read after I make it small enough to post. If you have a fax, I will fax it to you.

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Old 06-28-2005, 07:25 AM
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Steve,

Thanks a ton for your time. I looked at the diagram you posted and I was able to get the same one from a colleague. Thanks again for your trouble.
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Old 06-29-2005, 05:15 AM
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Doc and 1931 Steve: Thanks to both of you for your efforts. I got my trusty VOM out last night and a packet of 10A fuses and started checking things out. The two wires that run to the compressor had zero ohms between them...hmmmm. I was able to pull them out only about an inch but was able to see that they had both worn through and were touching one another. A little electrical tape later and the A/C is working! It's been in the 90's here for the past couple of weeks and it's supposed to be over 100 today so it was a very welcome feeling to have cold air coming out of the vents. Thanks again.

Barry
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Old 06-29-2005, 05:47 AM
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I am happy for you..you got it working....

thanks for getting back to us and telling us what you found!!! A lot of people don't bother to give us a heads up??


Tazz


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