Just joined the forum
![Very Happy :D](./images/smilies/icon_e_biggrin.gif)
I recently changed the variable displacement compressor in my Ram 1500 to a fixed displacement compressor, the original was 7sbh17c denso that I have replaced with 10sre18c valeo. The valeo unit I believe is the same as the oem ones for the 2009-2010 year for the same truck. I took out the control valve of the original compressor and connected the plug ( so that the hvac module can't tell I changed the type of compressor and keeps everything runnig ) and zip tied it to the frame under the hood.
I did this to get better cooling since the original hvac system keeps changing the temperature according to multiple sensors readings and would never let the ac vent temp get below 48°, well, I live in Saudi Arabia and this kind of temperature would never get the interior cool enough, specially with the ambient temperature getting over 120° frequently.
Well, after replacing the compressor and charging the system with the specified weight on the hood sticker(510g) the temps were worst than before(idle and freeway), after this misfortune, I kept venting (sorry environment no recovery machines here ) the refrigerant untill I got the system to 30 psi at idle at 95° ambient. This is the best performance I could get up until now. At freeway I could get it to blow a nice 40° out the vent. I'll try to find a shop with a recovery machine to get the exact weight of refrigerant I have in the system now.
I should mention that I also converted the system to 134a instead of 1234yf.
So after this long introduction, how should I know the exact weight of the charge considering that I changed compressor type? Also, the idle vent temperatures are always above 50° both with full charge and vented charge, with vented being slightly colder. How could I get better cooling at idle? PS, I got SPAL pusher fan waiting to be installed soon.