Has anyone ever heard of an upgrade for the stock heater fan? The only thing I have ever done was to run heavier wires to it, and that helped a lot, but I remember reading somewhere that there was an aftermarket fan that would bolt right in and provide much better air flow.
thats a good question i was wondering the same when it was 35 below and it took like 30 mins. to defrost my window the heat was plenty hot but the flow sucked.if i am correct the stock fan is not actually a fan but a wheel with blades like a paddlewheel boat. if an actual bolt on fan is not an option then i will have to make my own i guess.
__________________ "Brutus" 79 f250 ranger
It ain't always pretty, But it's real"
I've been looking for an answer about this on this site for quite some time now. As soon as someone comes up with details, I want to get that project done.
What would the relay do?
Does the Jeep fan motor bolt right in?
Do these increase the fan motor rpm's?
I hope someone has the answers to this as I really need more air flow.
I've been looking for an answer about this on this site for quite some time now. As soon as someone comes up with details, I want to get that project done.
What would the relay do? Provide full alternator power rather than the power routing thru the switch
Does the Jeep fan motor bolt right in? Kind of, the heater box has to be enlarged a little
Do these increase the fan motor rpm's? The relay will a little, a modern fan will kick some butt
I hope someone has the answers to this as I really need more air flow.
I think the link to the Jeep motor mod is on another competing website, I'll have to look it up.
It's an 84-86 Jeep Grand Wagoneer with A/C blower motor, swap over the mounting plate and squirrel cage and then wire in a relay to get full power to the motor.
Most report that the 2nd speed with the Jeep motor is Hi with the old one. So it would be comparing an 80 year blowing out birthday candles to a leaf blower.
If I understand correctly, buying a new 84-86 Jeep Grand Wagoneer A/C blower motor will blow more air. And if I add the relay to it it will blow even more. I'm still a little confused about the relay though, will I have just one setting, full spped or off?
thanks for your help I think i'm getting on the right track.
This the write-up from Knightfire83 from the website:
Now comes the time to keep your wiring from burning up your truck. We have upgraded the motor size, and installed a plastic lighter wheel assembly. This baby is gonna spin like never before, and is going to use more power. You will need to install a relay for the highest fan speed. To do this you will need a 20-30amp automotive realy. Connect as follows:
Relay Switch- One fused heavy guage wire directly to the battery positive side. The other switched connection to the blower motor positive wire.
Relay Coil- You will need to cut (cut it long) the orange wire from the back of the factory heater fan speed switch. The side that goes towards the switch will be connected to the relay coil, the other side of that cut wire will need to be insulated with electrical tape or a wire nut. The other relay coil connection will go to ground.
He didn't have pictures of this particular part of the mod. It makes sense in my mind, just hard to explain.
I hope I haven't mislead in the sense that I have done this mod myself because I haven't.
If it were me, I would run a new fuseholder and relay near the blower motor in the engine compartment with a larger 10g wire to the switch, bypassing the OEM fusebox and wiring. This would mean being able to leave the fan running with the key off, but that shouldn't be a problem.
Just what I was needing, thanks for finding it. I'm assuming the relay coil must keep the switch able to have different fan speeds. I can find out how it works as I don't think I have ever messed with a relay coil before.
Are you sure the defrost / heat dampner is shutting all the way when it's in defrost ? Is the air good and hot ? I have no complaints with my HO heater box.
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'79 F250 13" lift 42" Super Swampers
I think the doors are working right, when it is blowing, it blows out where I select - defrost/vents or floor. As far as the heater dampner door, I'm not real sure on that one. Sometimes the air is hot and other times it is just lukewarm. I do have factory A/C and am planning on replacing the heater core and evaporator and blower motor. I'll check the door functions when I tear into it. I've just been waiting to do this since I have not wanted to tear it apart until I could find a way to get a better blower motor.
I have checked the ductwork behind the dash for leaks and you can just tell from feeling the air out of one of the vents, such as the floor, that it just does not blow out much air at all. You can also hear that it does not blow well.
I'd look for some door / switch that isn't working right. Could even be in the heater, ac control panel ? Sounds like something isn't working right. Did you check to see if the return hose is hot when the heater is on ?
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'79 F250 13" lift 42" Super Swampers
Both heater hoses get equally hot, I suspect the heater core or the blend door. I ran a garden hose through the core and it didn't flow out as much as was being flushed in,but still had a flow. I replaced all the swithes on the control panel and new cable for the blend door, there is no vacum leaks, and every setting on the control panel activates the proper vacum control for the coresponding doors. The blend door opens and shuts properly. I just got done checking the fan voltage out of curiousity, it's at 11.0 volts on high.
I'm wondering if its a plugged heater core or the blend door not sealing right, or maybe air is getting past the sides of the heater core.
Last night I drove it for a couple of hours the outside air temp was 60 degrees and had the heater running full speed and it was blowing warm, you would think it would cook you out of there but it didn't.
It should have cooked you for sure. I know for sure somethings up with the blower off and I bumped the heater control to floor, just the air pushing thru there from driving cooks my feet.
There is also a control valve in the heater core to stop flow when the a/c is on.
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"Brutus" 79 f250 ranger
1974 F100 Custom Styleside 428 Cobra Jet Dual Quad
