Starting problems-starter tested okay at auto shop. Pretty sure battery is fine. All connections cleaned. Sometimes cranks and starts just fine, then it will only click. Repeatedly turning the key to start eventually gets a "catch" and car will start. Sometimes it will crank strongly and then slow to almost no cranking power and then quit; next attempt will usually just be the "click" again.
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Your tempermental starting problem could be the park neutral safety switch . They get worn inside an cause this type problem . Next time it won't start place gear selector into neutral an see if it starts then . The cooling running problem is probably the cooling fan timer module . From the diagram it's hard to say which side the A/C condenser fan is on. The A/C fan has blue with yellow stripe wire in the connector along with a black one . I would also suggest you have a qualified repair shop do a voltage drop test on the starting circuit . How to voltage drop test starter motor circuit
OK, take the 1991 GMC Sonoma to Sears, Walmart, or your local battery retailer like Autozone or Advance Auto Parts, and have them test the starting/charging system. In many cases they'll do it for free or charge a nominal fee.
Also, you may in the interim check the connections to the battery to make sure they are shiny and clean when removed. Use a wire brush, if necessary to clean them up.
Lights working but no cranking is usually a bad electrical connection at the battery/starter, dead starter or starter solenoid. Do not forget to check all of your fuses.
First thing I would do is remove wires from battery and clean them of all corrosion. Also clean the battery where the wires hook up. Hook the wires back up and try starting again...make sure the wires are connected firmly/tight.
Then I would remove the positive battery cable where it meets the starter and clean that connection up real good. Try starting again after back together.
I would then follow the ground (Black Wire) from battery to where it connects to the frame, clean that connection up real good also.
"Cleaning" a connection is taking a wire brush or sandpaper to it to expose nice rust/corrosion free metal.
If cleaning the connections does not work, then remove the starter and take it into your local auto parts store to have it tested for free. The starter will have the starter solenoid connected to it, they will test that also.
By how you described it, I think just cleaning the battery posts/wires will remedy your problem.
mcdevito75 here, A well meaning and even knowing friend, relative Etc. could check your battery and starter and give them a clean bill of health, the fact is the starter would have to come out of the car to be tested to be really sure. However, I'm thinking toward an old battery 2 years old (replace), dirty Battery connections, a bad connection at the starter. If all this checks out OK, have your local repair shop take a look.
Check ALL your connections. Take each Batt terminal off and scrape them or buy a Batt. brush from parts store/cheap 7 bucks. If you can jump it it may be the Batt. has just gone.. Clicking means you have a bad connection or the Batt is shot.
If you're not getting any spark, it may be the coil or the igniter, both of which are located inside the distributor.
If no fuel, you may have a problem with your main relay.
Check out tegger.com for more information on these components as well as other possibilities.
1.Make sure all connection to the battery are secure opposite end of pos/neg connections connecting to the starter and and ground are also secure and clean..
2.Try jump starting the car.
3.If step one or two did not correct the problem, have the battery tested and re-charge the or replace the battery if required.
4.If the above three steps do not correct the problem, before starting the car, gently tap on the starter with a small hammer, then try and start the car. If the car starts, you have a faulty solenoid in the starter, which indicates the starter needs to be replace. Please rate this solution if you found this helpful.