ac fuse blows ???

[bert]

winter time here right now…havent used the ac in a while
but…had to turn it on the other day…no cold air ?

took it in to the shop,,,,freon evac’d and replaced.

couldnt test the system for leaks and such cause a 10 amp fuse keeps blowin

blower in the cab works fine,just blows “warm air” though.

whats this fuse control ?

short most like;y the prob but from where ?

’98 dodge ram 1500 5.9 eng

Topic

[college man]

Unplug the ac compressor and replace the the fuse with a good one.
test for 12v at the connector. If you plug the compressor back in
and the fuse blows the compressor is suspect.

[bert]

[quote=”college man” post=90170]Unplug the ac compressor and replace the the fuse with a good one.
test for 12v at the connector. If you plug the compressor back in
and the fuse blows the compressor is suspect.[/quote]

hmmm THATS A GOOD IDEA !!!!

but isnt there a relay and a celonoid on the same circuit ????
or is all that in the comp. ??

in calif…a shop has to do all ac-freon related repairs.
makes it expensive to “throw parts at her”
I’m trying to isolate/pinpoint the prob and cut cost

If I “hot wired” the comp. direct to batt.as a test(suggested from another forum)…would that bypass all oyher components ?

[valde]

Yes there is lot of other stuff in the circuit but compressor itself is most likely problem. If you just wire compressor directly to battery (with fuse) you’ll also get same info that is the problem with compressor. You may not have to do anything with “freon” if you only replace ac clutch.

[paul]

I once had a problem with a bad diode under the hood in the fuse compartment of my 2004 Grand Am. It took a while before I was able to see the relevance through schematics and resolve it. I think it also took care of another peripheral problem aside form the A/C not working.

Just a thought in case the other ideas leave you still scratching your head…

Best to You!

sols

[college man]

[quote=”cj5orion” post=90257][quote=”college man” post=90170]Unplug the ac compressor and replace the the fuse with a good one.
test for 12v at the connector. If you plug the compressor back in
and the fuse blows the compressor is suspect.[/quote]

hmmm THATS A GOOD IDEA !!!!

but isnt there a relay and a celonoid on the same circuit ????
or is all that in the comp. ??

in calif…a shop has to do all ac-freon related repairs.
makes it expensive to “throw parts at her”
I’m trying to isolate/pinpoint the prob and cut cost

If I “hot wired” the comp. direct to batt.as a test(suggested from another forum)…would that bypass all oyher components ?[/quote]

If the 12v is read at the connector unplugged. Then all the wiring and
components would be good. I would not wire off the battery with no fuse
protection. If the compressor is shorted it will pop in your face. Test
the coil of the compressor with an ohm meter. anything less than 3 ohms
is a short.

[EricTheCarGuy]

Do not run unfused power to it like that. As College man said, if you disconnect the connector from the compressor and it doesn’t blow, then your compressor clutch is likely at fault. It may also be the compressor. To check that try spinning it by hand. If you can spin it by hand, it’s probably OK. Do this with the engine off BTW. If it spins freely, then just replace the compressor clutch and recheck for the problem.

Good luck and keep us posted.

[Michael Whim Jr]

This has been a big help to me for troubleshooting a 2005 Ford freestar that keeps popping the clutch fuse. Ithe ac compressor connector measures 13.98 -ish volts. Is that an okay reading? It seems high when I hear people say ” look for 12V”
Thanks for your help.

[Thomas]

The alternator in your car produces voltages between 13 and 15 volts. The battery usually sits around 12-12.5V when car is off. So to charge your battery you need to apply voltage above this value. If the alternator had outputed 10V the battery would not have been charged. 14V is a good reading.

The voltage you meassure will vary, because of wire lengths, wire thickness and the load on your system.
Just for fun, turn on your car. Turn off the blower and headlights, meassure the voltage at the battery. Now set the blower to full speed and turn on the high beams. Now go again and check the voltage, it will have dropped signitifcantly.

[Author]

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