AC Blower Turns Off Automatically [ Honda City 2000 ]

[Skill]

strange :-!

[fahadwizz]

today jump started the blower by matting the terminals of blower fan speed selector switch but same behavior remains, the wire also got warm during experiment, whats next guys any clue

@xulfiqar
got one bulb for the AC switch and light on the switch does not goes off when blower trips, checked the AC clutch and it remains engaged contrary to my previous writing, but question remains if this is related to AC electrical then why blower behaves same on heater or simply when it is turned on.

If the ac clutch remains engaged i m thinking that ur blower motor has issues May be it just stops spinning. It doesnt matter if ur running the heater/ac/nothing. Ac clutch staying engaged kind of solves the mystey

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[fahadwizz]

Your ac system thinks that the blower is running. If there had been a problem with the switch , the clutch wud have went off

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[mahmood]

Your ac system thinks that the blower is running. If there had been a problem with the switch , the clutch wud have went off

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yeh wali baat dil ko lagti hai, ok switch tu saaf saaf bach gaya, now its blower and it stops and it runs and it stops and it runs....... so what can make it behave like this, if it would have the blower resistor, i've checked as you have seen its intact and all three resistors there showing different resistance on multimeter, what else remains to be checked, any idea !!!!!!!!!! i have even replaced the relay attached with the blower but no use

[fahadwizz]

yeh wali baat dil ko lagti hai, ok switch tu saaf saaf bach gaya, now its blower and it stops and it runs and it stops and it runs....... so what can make it behave like this, if it would have the blower resistor, i've checked as you have seen its intact and all three resistors there showing different resistance on multimeter, what else remains to be checked, any idea !!!!!!!!!! i have even replaced the relay attached with the blower but no use

Just service the motor

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[mahmood]

Just service the motor

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aik sec, aisa tu nahi k motor k bearing heat up ho kar jam ho jate hon, but unko slow hona chahiye pehle, aik kaam aur kia ja sakta hai, i'll get a motor from my electrician and plug the power jack onto the new one by removing and extending from original blower, or perhaps i can remove motor from brother's mehroo. what do you say of this idea???

[fahadwizz]

aik sec, aisa tu nahi k motor k bearing heat up ho kar jam ho jate hon, but unko slow hona chahiye pehle, aik kaam aur kia ja sakta hai, i'll get a motor from my electrician and plug the power jack onto the new one by removing and extending from original blower, or perhaps i can remove motor from brother's mehroo. what do you say of this idea???

If it fits its a good idea.

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[Xulfiqar]

if the ac button light is lit and the blower turns off, then most probably the blower carbon brushes are bad, try to tap it with a small hammer when it stops, if the blower starts up then the brushes are worn out for sure, also if your blower motor is squeaking then that also means its bad.

This is a classic symptom of the blower motor dying.

[Skill]

i was also thinking the blower motor itself seems jammed.

[mahmood]

i was myself pretty hopeful yesterday that we have narrowed down the problem but today its some other story, so here is todays experiment

• turned on the blower and wait till it turns off
• blower turns off
• tapped the motor with screw driver back and it didnt kick started the motor
• repeated same with two shut offs and same result
• then instead of swapping the blower motor with mehran's removed the power grip from blower motor and fed it to multimeter
• and results was as following

so motor is safe its the input which is at fault, as shown in pics it goes to zero and gradually increases, when voltage is at normal level motor kicks in.

so what can cause this behavior, after this i also unplugged the blower resistor and started the blower at speed 4 and exact same behavior, any ideas guys.............

[margallar]

repace your multimeter battery :P, i also need to do that after forgetting to turn it off

[mahmood]

repace your multimeter battery :P, i also need to do that after forgetting to turn it off

hahaha, pa ji this is janian battery and it have lasted several on occasions overnight and your is just three weeks or so old, mine is at least couple of years

[margallar]

dam, i just forgot it for 3 days, opened it today, the 9v battery was also uni T branded, ill buy a replacement tomorrow, best of luck with your project

[Xulfiqar]

Check the wiring, this sort of behaviour is caused by bad contacts. Trace back the wiring and see where you have the loss. The two blue wires to the blower are a short subharness, check before this harness and replace the subharness if you see proper behaviour before it.

If you dont get your result, trace backwards till you find it.

to test meter - plug it into the wall and test A/C - compare to another meter. That way you know its good.

[mahmood]

Check the wiring, this sort of behaviour is caused by bad contacts. Trace back the wiring and see where you have the loss. The two blue wires to the blower are a short subharness, check before this harness and replace the subharness if you see proper behaviour before it.

If you dont get your result, trace backwards till you find it.

to test meter - plug it into the wall and test A/C - compare to another meter. That way you know its good.

dammit, it better be just the loose grip contact somewhere and better be easy to trace back, next update on weekend i guess.

meter itslef is good, its internal 9v battery is weak and it is indicated by a battery sign on LCD, we were discussing this one, else no problem with meter.

[Xulfiqar]

That little short subharness that connects to the blower motor can be a PITA. Its actually set up to save your original wiring from melting - consider it a fuseable link in the circuit.

[mahmood]

yeah looking at the wiring schematic it should be connecting with output of blower resistors and should be close by, will have a brief look tomorrow removing the glove compartment if found something then good else will do it over the weekend aaram se

[mahmood]

@xulfiqar

only if you have not written that PITA thing above :mad: this is what i got today

now thats what i call a PITA, and for better feel herez another teaser

now i was expecting that blue wiring harness will be a small one as in civics but here wires from both the blower resistor and this blue pair gets under the carpet behind the blower motor along with firewall in such a way that it is un accessable, go got to the other side and under and found same color wires and found some burnt ends in a grip, got multimeter out tested continuity and verified, the grip was stuck got taken out the grip from the circled female grip in the first pic and above was the scene, its plugged into a relay couldnt get a good look as i have to take down the fues box but certainlt a relay clicks on movement of grip. luckily i have this at home with me

you can see the same jumper plugged into the grip in the first pic for testing purpose, now this is certainly a sunday job for me to do, i think i can use two exiting wire by taking them out the current burnt grip and rest two thick wire need to be jointed to the new wires.

[margallar]

thats an ouch....

[Xulfiqar]

Told you its bad connections, anyway - solder the wires together, twist and tape will not transfer full amps.