NBS A/C doesnt blow good

[kybray44]

I have a 00 and it seems that i have to put my a/c on 5 to keep cool. At 3 or 4 it barely blows . Any suggestions or ideas as to why this might be? Just the way it is? Thanks

[85-bowtie]

have you changed the cabin air filter?

[kybray44]

yep, at 90k, the old one wasnt that dirty and i now have 107k

[kybray44]

the air "pressure" for lack of a better term isnt much at all

[popknot98]

when did it start acting like this?? before or after new filter? if after new filter maybe u didnt get it seated in the groove properly letting air escape that way befor it even gets to the cabin? dunno, i'm stabbing in the dark here with a wax knife....

[ibanender]

Perhaps your fan motor isn't getting appropriate voltage? I've never checked it, but I'd guess with the fan on 5 you'd have 13-14v with the truck running, and less voltage as you turn the "speed" down. If your fan is going bad or you have a poor connection for whatever reason, that would cause low voltage.

[kybray44]

ill check the voltage, it was bad before the swap. i thought that the old filter was the problem and when i swapped it wasnt used(during the winter) and now im using it, i realized it sucks

[99Z5.3]

Could be a resistor in the fan control switch. Controls different speeds, there is four resistors, 12V goes to 5 and resistors step down to reduce voltage.

[ibanender]

Originally Posted by 99Z5.3

Could be a resistor in the fan control switch. Controls different speeds, there is four resistors, 12V goes to 5 and resistors step down to reduce voltage.

That's where I was going with that

[kybray44]

so should i test at the switch or at the fan meter...how good does your guys A/C blow?

[ibanender]

Originally Posted by kybray44

so should i test at the switch or at the fan meter...how good does your guys A/C blow?

I'd test it at whichever is easiest to get to, which is probably the switch. If everything checks out, then do it at the motor.

[Jetway]

Originally Posted by kybray44

ill check the voltage, it was bad before the swap. i thought that the old filter was the problem and when i swapped it wasnt used(during the winter) and now im using it, i realized it sucks

You said that it wasn't used during the winter. Obviously, you're referring to the AC. Are you implying that the heat blows strong?

[kybray44]

yes, the heat blows better than the cold?

[vegaman04]

There is a thread on here that tells you how to clean the entering side of the evaporator coil. You might have some dust / dirt / grime build up. Basically take the blower cover off, remove large debris, soak with coil cleaner, and rinse thoroughly.

[kybray44]

thats an OBS though...good thinkin but ive already read that

[vegaman04]

Check for proper voltage first. Why cant you do it on a NBS?

[kybray44]

i believe they redesigned it with a filter so taht it wouldnt clog up...it says that in the thread you were talking about.

[ibanender]

Good point on the heat vs cold. That leads me to another question... When you were using the heat, did you use only out of the floor vents or the top vents too? Have you checked air flow out of the floor vents or defrost for AC?

[kybray44]

only use up top vents on both A/C and heat...defrost when necessary

[ksukats57]

Go to the junkyard and pull a resistor and see if that fixes it