Blowin Air Harder (airconditioning)

[SYNFULL]

I was wondering if anyone has ever changed out their fan blower motor for one that blows harder/faster. I think the problem with the Viper's airco is that the fan doesn't blow hard enough. This would be a simple fix if we could swap out the motor for one with a higher spinning rpm.
Just a thought I had as I was falling asleep

 

[Tom F&L GoR]

The speeds are due to electric current passing through different resistors. You could increase the fan speed, perhaps trying the fastest setting only, by replacing one resistor with another of less resistance. Since the resistors are coils of wire, I assume a shorter wire (one less coil?) would do what you want.

If you cook the blower motor, well, you were going to change it anyway.

 

[GTSnake]

I would think any man would like to have their snake get blown harder...

 

[pattymelt3605]

I would think any man would like to have their snake get blown harder...

lol, is their a real solution to this?

 

[Johann]

The problem with increasing the fan speed is often a reduction in the actual temperature at the register(s).

The longer the air lingers in the evaporator the more heat transfer will take place.

 

[Tom F&L GoR]

Before I get on my soapbox, perhaps you meant to say an increase in the actual temperature at the register (vent)?

If so, this is the same as the radiator myth - don't remove the thermostat, put a washer in place of the thermostat becuase otherwise you don't get enough residence time in the radiator.

Yes, the actual temperature at the dash vent might be higher, but the resulting cooling rate (BTU taken from skin temperatures) will be higher. Lots of 60F air feels better than a little 50F air.

If you really really want to try this, locate the resistor block and wrap a paper clip around adjacent coils. This will bypass one coil (paper clip resistance being less than the resistor coil) and the fan will run faster.

Umm... no guarantees.

 

[Ron]

If you open the hood and put your hand above the airbox while the blower is on high, you'll see the flow is pretty darn strong. Perhaps insulating the engine side exterior of the airbox to minimize heat infiltration would help?

 

[SYNFULL]

All I know is the airflow out of the vents is terrible and if we could get it to blow harder it would be a big improvement. The Viper's high speed is like the low fan speed on most other cars.
Tom,
Where are these resistors located? In the dash behind the knobs?
Thanks
Gary

 

[GTS Bruce]

Get the hot out faster and better.Highflowing exhaust w/o cats if you're not sniffed.Vented cowl.Some stick on aluminum/fg insulation facing the engine compartment on the foot wells.Problem being too cold then.Umm,sure the ac is up to full charge? GTS Bruce

 

[Tom F&L GoR]

All I know is the airflow out of the vents is terrible and if we could get it to blow harder it would be a big improvement. The Viper's high speed is like the low fan speed on most other cars.
Tom,
Where are these resistors located? In the dash behind the knobs?
Thanks
Gary

On Gen 1, the resistor block is in the engine compartment, on the bottom side of the heater blower housing. It should be removeable without having to remove the housing. Look for the bundle of wires that attaches.

 

[Johann]

Before I get on my soapbox, perhaps you meant to say an increase in the actual temperature at the register (vent)?

You're right, I know what I meant to say but................

Yes, the actual temperature at the dash vent might be higher, but the resulting cooling rate (BTU taken from skin temperatures) will be higher. Lots of 60F air feels better than a little 50F air.

Probably varies with the individual, I have a couple of vehicles that feel like 40 mph on a Harley with the fan on 4 (high) but I notice a more desireable comfort level with the fan in 3 or 2. I think the comfort level at any fan speed would improve if the airflow were directed totally at the face/upper torso rather than half at the crotch.

 

[Tom F&L GoR]

True, SAE studies show drivers/passengers are more comfortable with heat at the floor and cold air at the shoulders/head. The crotch thing is a little low...

The dash cover comes off easily and you can plug the crotch vents with dark or black cloth. You might test the idea just by covering with duct tape.

 

[Bolt]

The speeds are due to electric current passing through different resistors. You could increase the fan speed, perhaps trying the fastest setting only, by replacing one resistor with another of less resistance. Since the resistors are coils of wire, I assume a shorter wire (one less coil?) would do what you want.

If you cook the blower motor, well, you were going to change it anyway.

I ripped my fan appart to check this out. When your fan is on high it is not using any resisters. This is as fast as it goes. The resisters are being used to slow the fan motor down and you decrease the fan speed at the dash.

Bolt

 

[Tom F&L GoR]

Hmmm... Usually when an electric motor slows down, the brushes are dirty or the springs behind them are weak. Can they be cleaned up and re-stretch the springs?

 

[SYNFULL]

Maybe we can get a part number off the motor and cross reference it with another motor that has higher rpm.

 

[Tom F&L GoR]

PN 4848021, but that is the blower with the squirrel cage and housing (blower housing, not the intake plenum.)