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. 

Need a new blower motor and blower resistor.

20 minutes ago, jag said:

 So I am going to install a 2006 Dodge ram fan with more blades & reverse rotation. 

  

 

Will that work? Is the fan blades reversed also so that it will still blow and not suck, in your application?

I have the resistor just incase it's required.

Yes the fan blades are cupped in the opposite direction.

With clockwise rotation the air flow comes off the bottom of the fan looking at it from the fan side. The ccw fan, the airflow comes off the top. There is going to be a difference in how the air flows. Just think back then, they were still learning what works better. Look at VP, 1 year it worked, but then they discovered Common rail, it works better. Same thing with ECM, 98.5 worked, but by the time 2002 came around, it had better memory. There is always a reason for change.

3 hours ago, NIsaacs said:

 

Will that work? Is the fan blades reversed also so that it will still blow and not suck, in your application?

 A centrifugal fan can not work in reverse, for the purpose of A/C anyway. Spin direction can change, flow cannot... in the middle and out perpendicular to the axis of rotation. 

 

3 hours ago, jag said:

I have the resistor just incase it's required.

Yes the fan blades are cupped in the opposite direction.

With clockwise rotation the air flow comes off the bottom of the fan looking at it from the fan side. The ccw fan, the airflow comes off the top. There is going to be a difference in how the air flows. Just think back then, they were still learning what works better. Look at VP, 1 year it worked, but then they discovered Common rail, it works better. Same thing with ECM, 98.5 worked, but by the time 2002 came around, it had better memory. There is always a reason for change.

They have known how centrifugal fans worked since the 1830's and had it perfected since the 1890's. I'm unsure what you are trying to accomplish by putting a fan in that has blades facing the wrong way as well as spinning the wrong direction. 

 

 

Should have listened when MoparMan stated the the layout of the box is difference. I can't believe I talked myself into this. With the motor in reverse rotation plus the fins cupped the correct way for rotation, the air would have nowhere to escape. Just didn't see it.

This is how we learn not to try & be an engineer.

Cancelled the 2006 fan & ordered a new blower motor for my 2000.

Thanks Mopar Man.

Well this is what I finished with. 2 stage fan. The top fan is fed by the normal way & the bottom fan is fed by 4 - 7/8'' holes drilled in the base of the fan motor. You can see the bottom fan blades through the holes drilled at the motor base. The flow of air is far more powerful, than I had with the stock motor & blade. Plus is I now have recirculate on any switch setting. I can now drive around with the blower on floor only on low setting. Don't need center vent as it moves so much air it is actually to warm to need it. This is just what I was asking for, more heat, & I got it. Very happy. It's proven to work. Dodge wasn't the only one to use the setup. Mercedes Benz used this setup also.

That is interesting. What is the fan off of? Still using the 2000 dodge motor it looks like. Figure out a proper filter system and you may have the best system to ever grace a 2nd gen Dodge truck. I'll give this a go on mine as well.

 

Side note, the fan is capable of a higher pressure before compressor stall due to its blade design, the stock one is more geared to high flow with moderate pressure. 

I would be interested in the parts you used also.

The fan is off a 2000 Dodge Grand Caravan. I had to enlarge the opening for the fan to fit in the box by 1/16". Other than that is just to get the fan sitting right, (up  down) on shaft.

The other reference I used was a 2000 Mercedes Benz C200 blower fan. They feed a bit different way, but same concept. I like this fan but could not find one local, so the Caravan was easy access from a junkyard for $10.00 & the motor was from RockAuto at $12.00. The full time recirculate really helps a lot in keeping truck warmer.

A lot of looking through RockAuto fans before I found the right one.

4 hours ago, jag said:

The full time recirculate really helps a lot in keeping truck warmer.

Doesn't that fog up your windows more 

No, because you are still mixing with the cold air coming in from outside. I poured about a quarter cup of water on the rug, & no fogging. Temp here has also been plus 5 to minus 20. Big temp swing but no fogging. 

22 hours ago, jag said:

The full time recirculate really helps a lot in keeping truck warmer.

 

@Dieselfuture asked you if that fogs  your windows up more.  You said,

 

2 hours ago, jag said:

No, because you are still mixing with the cold air coming in from outside.

 

Ok, in mind I see a conflict here.  How are you getting cold air from outside if it is in "full time recirculate"?

 

- John

30 minutes ago, Tractorman said:

Ok, in mind I see a conflict here.  How are you getting cold air from outside if it is in "full time recirculate"?

1 hour ago, Dieselfuture said:

I'll have some too.

7 minutes ago, dripley said:

I'll have some too.

         

                  Intermission

                                                              Please take 10 minutes and refresh your popcorn!

 

- John

Simple,

I changed the fan & bored 4 holes on motor housing. I did not touch original heater in any way, so it performs as prescribed.

With the split fan, it recirculates full time because of the holes in fan housing. The top part of the fans does it's thing by bringing fresh air from outside, just like it should, & the bottom fan intakes the cab air via the 4 holes plus preventing the outside fresh air from coming in, with positive pressure going back into the airbox, thus full time recirculate on a smaller scale than MAX air.

Look at the bottom of the the fan housing on the Caravan, it's wide open. Same on the Benz.

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 

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.

4 hours ago, jag said:

Look at the bottom of the the fan housing on the Caravan, it's wide open. Same on the Benz.

This is crazy, my step dad's 2000 Chrysler Town & country blower motor started making squealing noise yesterday and randomly quit working, so since I came over for dinner I had him get new motor and resistor before I got there, took me about 20 minutes upside down changing it and what I so is the blower has holes in it like you drilled only molded in plastic housing, but then it has another cover that covers the vhac box. Anyway I kept the old blower fan, new one came with it, maybe I'll give it a try, must of been meant to be you brought this up and few days later I have a squirrel cage now, I still have my old motor for the truck that changed last year along with resistor because motor was getting stuff, few drops of oil and it spins like new so I put new one in since I got one and put original one on the shelf, now it can be a guinea pig for this test. Van on left ours on right.