Can someone please tell me what the ID size is on the nipple on the head where the heater hose inlet is connected to. Also, is this a restrictor to slow the pressure to heater core. 

2 hours ago, JAG1 said:

Would the 4 holes help drilled into the stock fan housing, not a Dodge Caravan blower, still be a significant improvement?

 

I got popcorn blowin' out my vents here 

No? In theory, no air there is moving. In practice, it will likely just blow out into the cab from there resulting in less from the vents.

 

1 hour ago, LorenS said:

Likely because I've never dealt with the blower assembly on my truck, but I am failing miserably in picturing what was done.

 

Also, the few times I've run my truck around -20 the last thing I needed was more heat in the cab. That may be because of the homemade winter front and blocking 2/3 the radiator with cardboard. I may have been running the 200 thermostat back then.

New blower and new motor. Factory motor with different blower. Added holes so non factory blower would work. The Heater core was replaced previously.

He is correct^^^^^^ JAG1

If anything it would blow air backwards through them causing low air coming from heater vents only making things worse.

Think of the fans working separately. The top half of the fan works as it should & the bottom fan draws air from inside cab compounding the air from the top fan being pushed into the cab. Remember, the cab is always under positive pressure when the fan is on. I do not have more air pressure, just a lot more air to flow, hence making it much warmer.

 

Dieselfuture;

Some had the cover, some did not. I think we all know how Dodge works from year to year.

 

Thanks for the explanation. I was hoping not to go to the wrecking yard for a caravan blower. I think what I will do is figure out a smart way, if there is one, to close that door behind the glove box and recirculate the air.

I believe it recirculates when door isn’t open 

To close the door behind the glovebox & recirculate the air is the way I have it now.

The door behind glovebox is closed. It opens for recirculate & shuts off outside air from coming in. The Caravan fan is the easy way.

JAG1, are you going to modify the door, or add a flap & cable or something to control it to open & close. Good luck. All I see is more cold air coming in. You will be on the wrong side of the fan.  This is the first I have seen to try & help our heaters. It works exceptionally well for me the way I have it setup.

 

Just operate the door with vacuum line and vacuum switch of some sort. Should not be that difficult.

 

And just so I understand, the upper portion of fan is pulling air in from above and the lower portion is pulling from underneath thru the drilled holes, in essence recirculating the cab air. Still seems you would pulling in some outside air from above if the recirc door was open to the outside and not in recirc mode. Less maybe.

1 hour ago, dripley said:

Just operate the door with vacuum line and vacuum switch of some sort. Should not be that difficult.

 

And just so I understand, the upper portion of fan is pulling air in from above and the lower portion is pulling from underneath thru the drilled holes, in essence recirculating the cab air. Still seems you would pulling in some outside air from above if the recirc door was open to the outside and not in recirc mode. Less maybe.

Or a zip tie, if this is something that is to be used for extended periods.