Top 10 2006 Dodge Ram 2500 Questions & Answers

Please check your ground wire they have a weak link there and have frequent problems on the ground curcit

The AC relay is located in the under hood fuse box. The cover should have a legend for location. Its one of the bigger black ones. You can rotate it with the horn or ABS one to see if its the problem. You may have a small fuse also in that box for it. If this doesn't solve the problem then you either have a leak or a computer problem. What a shop will do is try with a bidirectional data scanner turn the AC on. If they can't get it to turn on with a scanner then you most likely have a failed PCM if they verified you do not have low pressure or a relay or wiring or switch issue.

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P0533 A/C Pressure Sensor High.

It could be low on refrigerant, or it could be a bad sensor. Back-probe the pressure sensor connector (on the discharge line, near the compressor - it's a 4-way connector) on the dark blue wire with the engine running and the A/C turned to max. If you get no volts, or 5 volts, the sensor is bad. 4.5 volts indicates a properly-operating system, while less than 4.5 indicates low pressure, and anything above indicates high pressure. If low or high pressure is suspected, verify with a set of refrigerant gauges.

If warranted, the sensor can just unscrew. You won't lose refrigerant - there's a valve built in to the line to prevent that. Make sure to use a new O-ring and lube it with the proper oil if you do change the sensor.
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Fuse box on a 2006 dodge ram its under the hood on the driver side over the front left wheel. Its mounted on about a 45 degree angle and is easily opened with a flat head screwdriver. Check fig:--
Here is the PDC Box:check fig:--
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there is no relay in that box that is called the tipm or totally integrated power module. that module is controlled by a computer and should be checked with a scanner to see if you have a code for the a/c. i m having the same problem i have been told it could be low freon but can not get the clutch to engage to check the high and low pressure. Also read where it may be the diode in the clutch on the ac compressor if you have a multimeter probe the compressor a good compressor will read somewhere between 3.5 and 4.0 anything else and clutch needs to be replaced. other possibilities may be the high or low pressure switch on the line. on myh 2006 2500 diesel it is located near the plug for the compressor on bottom side of motor. hope this helps.

P0533 A/C Pressure Sensor High.

It could be low on refrigerant, or it could be a bad sensor. Back-probe the pressure sensor connector (on the discharge line, near the compressor - it's a 4-way connector) on the dark blue wire with the engine running and the A/C turned to max. If you get no volts, or 5 volts, the sensor is bad. 4.5 volts indicates a properly-operating system, while less than 4.5 indicates low pressure, and anything above indicates high pressure. If low or high pressure is suspected, verify with a set of refrigerant gauges.

If warranted, the sensor can just unscrew. You won't lose refrigerant - there's a valve built in to the line to prevent that. Make sure to use a new O-ring and lube it with the proper oil if you do change the sensor.

Rad Ride, It is common that the dodge in fuel tank screen on the fuel pump, clogs with small particles from bad or contaminated diesel fuel, I have a 06 Mega same thing, if you are stock no mods I would turn the key to run but do not start it , listen for the pump running in the tank. You can look through the driver side rear wheel well and see the upper corner of the tank. I put a broom handle on it and one end to my ear makes for easy check. If no sound check the fuse, but changes the screen if you hear the pump running. If so, run as much fuel out of the truck with out running it dry and then you have to drop the tank and remove the fuel sending unit and pump with screen. You may get lucky and just clean the screen and if not the pump as a kit. I have a few mods so I went with the Airdog system which takes the pump out of the tank and adds better filters and air reductions. Hope for the best, Good Luck,

This could be a few things. The freon could be low, one of the switches (high or low pressure) could be bad, or you could have a bad compressor clutch. You can test the clutch by checking for battery voltage and ground at the two pin connector with the A/C on if you have both power and ground, then the clutch is bad. You really should start by hooking up pressure gauges to the A/C ports to check the pressures, and these vary depending on ambient temperature and whether the A/C compressor is engaged or not. I am willing to bet that the freon is low though and may be just as simple as recharging the system.
Hope this helps. Good luck!

look for air bubbles in the dryer peep glass
if system is out of gas air con compressor clutch wont kick in
clutch is replaceable