A/C Amplifier Location

Another question I have is... why would the vehicle speed signal matter? you would think the faster you go the more air passes the condenser so it might lower the fan speed? That might imply that at lower speeds less air so you would have hi speed at idle or under a certain mph? and so possibly the techstream test is supposed to run the active electric fan test in high speed (relay 2 energized?)

 

I reached down (with a failing flashlight) and physically touched and removed dirt from the wire but saw only black? from what I remember.. if it were striped it would have been a black wire with a white stripe I'll check again

You're gonna have to elaborate on that
where can I find a list for all available MFD system checks?

 

no.. the wires are black and blue on the fan on the engine side. the vehicle is a salvage from what appears to have been front engine damage and I'm not so certain the original fans are in it?

 

you know... everything is working right now... I seem to have decent AC but it seems it could be better... and all controls work... I put techstream on it and recorded some temperature changes with it in auto and plan to compare those under the same conditions (as much as possible) when it isn't working... I am just curious if there isn't a control issue...

 

The way the system currently operates is very much on/off. one moment I have everything functioning including cooling and as soon as I shut the vehicle down (maybe once, maybe a couple times) things quit working. What does seem apparent however is the fans don't keep the engine cool enough while idling when the system is on the fritz... the engine temps reach 194F which is near max while the evap is around 84 (this is with both fans running and apparently stuck in low speed.) the temps when the AC is running seemingly ok is engine around 187F and evap at around 53? The compressor speed seems to go awry when things get fritzy also... the compressor will vary speed with difference between cabin and signal in a fairly wide band but topping out at 6300 rpm. However, when it's fritzy the compressor doesn't want to go below 4500 rpm even if I set the temp to max hi in auto? This all sounds like the amplifier to me? so it looks like I'm gonna plan time to get to it and run 101 tests

 

I've ordered one for $48 total... 2008 I think but supposedly tested and good?

 

preliminary results are in somewhat mixed but positive... the system now appears to hold it's own at idle i.e., both fans seem to run at high speed and the evap temp is staying cooler so the result is AC now at idle or low speeds. Also, under AC active tests in techstream I was able to get the compressor to 7200 rpm which I don't remember being able to do (or didn't try) under my last testing (and the air flow became real cool.) The caveat is the climate control on the right hand steering wheel side still fails so it looks like it's the spiral cable. The AC seeming is performing better than it ever has though.