blower motor/airflow

[Crashtest84]

So I searched a bunch on here for the lack of airflow from the blower. truck is an 89 ranger it never has blown very hard from the vents. The heater core and evap core are newer repalced spring of 2015 so about a year old. old evap was plugged with leaves an such. I was excited thinking it would blow better. not so much it did help but not very much. so im thinking it has to be leaking out pressure in the ducting under the dash... has anyone been under there and know where the joints are to check before I end up pulling the whole dash. this all came back up after getting a new to me 92explorer running again and the blower will hold you in the seat it seems compared to my ranger weird considering they are the same system.

 

[kimcrwbr1]

Are the doors working properly. Have you pulled the blower motor maybe the wheel is real dirty or has alot of crap in it. All it takes is 1/16 inch buildup on the fins of the wheel to reduce air flow 50%. Pull the motor and give it a thorough inspection. If the blower is running real fast on high the ducting is probably stuffed up somewhere. A new resistor wouldnt hurt either give it a look also.

 

[kimcrwbr1]

Another possibility is the wheel is spinning on the shaft just stuff to look at.

 

[4x4junkie]

One culprit I've seen for this more than once is the blower motor wired up backward causing the fan to spin the wrong direction.

Also if the foam seal between the blower housing outlet to the dash ductwork is missing/disintegrated could cause loss of airflow out the vents also (you should be able to see if this is the case by removing the glove box door).

 

[Crashtest84]

It's all clean and spinning correctly. I redid the whole a/c midsummer time new heater core, evap core, blower, resistor. Had hoped it would better the vent pressure. I'm pretty sure its leaking under the dash. In the ductwork. Just don't know where all the foam junctions are to check. Might get time tomorrow to check things out.

 

[Mark_88]

I haven't taken apart a second gen Ranger heater box but the first and third gen were completely different...and the 92 I had was different from what I saw...but there isn't really much too them.

You may need to remove the dash to inspect it at that level and the good news is that it's not that hard to remove the dash on that year...just take your time.

The outside box connects to the inside using carriage bolts that tend to spin out easily so be careful if you need to remove anything from the firewall...which may be needed unless you can seal the box without removing it...

I used some of that red insulation seal tape on mine where I could get at it...and this was needed when I put the 96 dash into the 88 cab (including the 96 heater box)...it is fairly strong and seals really well...it even gives good support...pretty awesome stuff...