Anyone know how to get to the blend air door on 88 Dakota 3.9 V6? A/C will come on and sounds as if it is blowing but it is not blowing any air out.
Any suggestions?

 

Lay on your back under the passenger side and look up at it.

You can also pull the lower 1/2 dash.

To REALLY get at it, pull the HVAC box (note: requires recovering the refrigerant and draining the cooling system) and work on it there.

But before you do all that ... look at the vacuum line from the brake booster (the small one) into the dash. If it's broken, the problem is not the blend door itself, but the vacuum to operate it.

I'd also suggest pulling the HVAC control and verifying vacuum to it to make sure that it's got vacuum to operate the blend door.

A lot of this is covered in the Factory Service Manual, section 24.

RwP

 

 

Vacuum it down properly. Do you have some R12 to refill it with, or has it been converted to R134a yet?

RwP

 

 

Then step 1 is to vacuum it down. Step 2 is to put only about 12 oz, with some oil and some dye, in to see where it's leaking.

I'd lay odds on the high pressure fitting; I went through eight and this one STILL seeps some. (The R134a conversion ones).

RwP

 

I plan on doing this, this weekend RalphP! I will let you know what the outcome is!

 

Just checked the ac system with gauges. Both high side & low side are reading the same. A friend of mine said he read that when this happens, either the ac compressor is going bad or the expansion valve is going bad.

Any suggestions?

 

When they both read the same, is the compressor running?

If not, well, no, they'll equalize to the same without the compressor.

WITH it running, what pressures are you seeing?

RwP