A/C and blower motor question

Bad89stang · 07-15-2003, 12:03 PM

Does being low on freon cause the A/C to pull more amperage/volts from the alternator?

My A/C works a little, but not that great. Whenever I turn on the A/C it draws big time from the electrical system. The higher the fan speed the lower the volts go. The car has been upgraded to a 130 amp alternator and it can't even keep up with the A/C.

Is this a blower motor problem or A/C related? I am leaning towards the blower motor since it does it when you turn the temp knob up. How can I test the blower motor? I have a digital voltmeter if that helps.

QuantumMotorsports · 07-15-2003, 02:19 PM

your blower motor is probably going out. Just a bearing inside it or maybe the brushes. You might want to get a new one or find a nice used one from a junk yard. The A/C compressor shouldn't make a difference so it should cause the voltage drop even when just running heat.

Bad89stang · 07-15-2003, 03:15 PM

****. Thanks for the help.

GhettoPop · 07-17-2003, 01:59 PM

in my 90Gt i also noticed that the when using heat or A/C, my electrical system gets weak. car shifts and driveslike sh*t with the a/c on. i know the a/c hurts performance but i have not seen an a/c drain a car's power like it mine does.

i also noticed fan speed one does nothing basically, #2 and #3 are almost identical, and #4 is much much stronger. is my blower motor going? where can i pick up a new unit?

Bad89stang · 07-17-2003, 02:15 PM

doesn't sound like you have the same problem as I do. Does it do it while on "vent" only? Take the A/C out of the equation and see if having just the blower motor on is causing any problems.

Mine doesn't affect the driving at all. Just pulls too many volts from the system.

GhettoPop · 07-17-2003, 02:38 PM

Quote:

Originally posted by Bad89stang
doesn't sound like you have the same problem as I do. Does it do it while on "vent" only? Take the A/C out of the equation and see if having just the blower motor on is causing any problems.

Mine doesn't affect the driving at all. Just pulls too many volts from the system.

The fan will work fine on vent or floor, but when i put it on "MIX" or especially on just the windshield, my electrical system takes a SERIOUS drain. sometimes with the heat on the windshield, when i push the clutch at a redlight, the car will drop RPM's and stall out. Help?

07-15-2003, 12:03 PM	#1
Bad89stang Registered Member Join Date: Aug 2001 Location: Ft. Worth, TX Posts: 456	A/C and blower motor question Does being low on freon cause the A/C to pull more amperage/volts from the alternator? My A/C works a little, but not that great. Whenever I turn on the A/C it draws big time from the electrical system. The higher the fan speed the lower the volts go. The car has been upgraded to a 130 amp alternator and it can't even keep up with the A/C. Is this a blower motor problem or A/C related? I am leaning towards the blower motor since it does it when you turn the temp knob up. How can I test the blower motor? I have a digital voltmeter if that helps.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Questions about Alky/Water injection with a positive displacement blower	stangsrule	Power Adders	0	07-22-2003 12:58 PM
Another blower question	bigred90gt	Windsor Power	2	01-12-2003 11:14 AM
Novi blower problem	exgmguy	Windsor Power	3	05-18-2002 11:30 PM
Blower or n/a parts first: your thoughts?	Capri306	Windsor Power	5	06-05-2001 09:17 PM
Why 3:55 gears for blower cars?	Mike_W	Windsor Power	2	05-26-2001 09:44 AM

07-15-2003, 02:19 PM	#2
QuantumMotorsports Registered Member Join Date: Jul 2000 Location: Norman, Oklahoma, USA Posts: 597	your blower motor is probably going out. Just a bearing inside it or maybe the brushes. You might want to get a new one or find a nice used one from a junk yard. The A/C compressor shouldn't make a difference so it should cause the voltage drop even when just running heat. __________________ Michael Black QuantumMotorsports Norman, OK 1984 LX Hatch 306 w/ TRW forged flat toppers, Comp Cams Magnum 292H, GT40P heads w/ 3 angle valve job, .550 lift springs, Angus Racing Roller Rockers, Weiand Stealth Intake, Holley 4150 650cfm carb, MAC 1 5/8 Long Tubes, Single Chamber Flowmasters, 91' T5 w/ Pro 5.0 shifter, Turbo Coupe 8.8 Rear w/ 3.55 gears, QA1 Motorsports tubular K member, no interior except steering wheel and seat. Coming soon: 6 or 8 point cage, Fuel Cell, Weld Draglites

07-15-2003, 03:15 PM	#3
Bad89stang Registered Member Join Date: Aug 2001 Location: Ft. Worth, TX Posts: 456	****. Thanks for the help.

07-17-2003, 01:59 PM	#4
GhettoPop Gimme a Drink! Join Date: Dec 2002 Location: NYC Posts: 694	in my 90Gt i also noticed that the when using heat or A/C, my electrical system gets weak. car shifts and driveslike sh*t with the a/c on. i know the a/c hurts performance but i have not seen an a/c drain a car's power like it mine does. i also noticed fan speed one does nothing basically, #2 and #3 are almost identical, and #4 is much much stronger. is my blower motor going? where can i pick up a new unit?

07-17-2003, 02:15 PM	#5
Bad89stang Registered Member Join Date: Aug 2001 Location: Ft. Worth, TX Posts: 456	doesn't sound like you have the same problem as I do. Does it do it while on "vent" only? Take the A/C out of the equation and see if having just the blower motor on is causing any problems. Mine doesn't affect the driving at all. Just pulls too many volts from the system.