1990 Honda Civic low air flow

THEGUILBEAUS

MEMBER
1990 HONDA CIVIC
4 CYL
2WD
MANUAL
192,000 MILES

I just replaced blower motor and resistor. When I run my ac now I can hardly feel any air come out. I can hear the difference in sound when I run the ac at different speeds. Just harld anything comes out at all. What do you think this could be?

Tuesday, December 15th, 2009 AT 10:09 AM

5 Replies

KHLOW2008

MECHANIC
41,814 POSTS

Hi theguilbeaus,

If the blower motor is not OEM, check if the terminals are reversed. This would cause low air flow.

Other possibilities are
1. Clogged AC evaporator fins.
2. Stuck air flow controls. Air would be coming out of other areas.
3. Leaking joints, symptoms similar to 2 above.

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Saturday, December 19th, 2009 AT 10:34 PM

THEGUILBEAUS

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8 POSTS

Are you talking about power terminals? Because its not OEM

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Saturday, December 19th, 2009 AT 11:23 PM

KHLOW2008

MECHANIC
41,814 POSTS

Yes, sometimes the motor runs in reverse direction depending on the motor. If that is the case, you would have to reverse the power by switching the input terminals.

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Sunday, December 20th, 2009 AT 3:19 AM

THEGUILBEAUS

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8 POSTS

Awesome that was it. One more thing then, my ac runs on R-14 however I heard it may work with R-134a with POE. Is this true?

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Sunday, December 20th, 2009 AT 4:50 PM

KHLOW2008

MECHANIC
41,814 POSTS

Technically both system are not compatible.
R12 uses a lower pressure whereas 134 is a high pressure system.

Practically it has been done and the only thing you might encounter is the cooling efficiency and the problem of filling the gases which uses different joints. You would have to get an adapter to fill in the gas.