Question about 1994 Jeep Cherokee Country

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Oil Pressure Gauge is Reading zero.

My A/C has freon but the A/C compressor isn't coming on. If you have a Solution please let me know. I've tried everything I can think of. Also my Oil Pressure Gauge is Reading Zero. When the A/C stopped the Oil Gauge went to Zero. Is the a connection?

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  • Jeep Master
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At this point, don't worry about the A/C...check to see if the wire is connected to the sending unit for your oil pressure. If it is, then, does the engine have any knocking or tapping? If it is, don't drive it. If Its still quiet then replace the sending unit.
I see no reason for any connection between the two problems but you never know what some crazy engineer may have designed into the system. Protect the engine first, then if necessary diagnose the a/c problem separately (could be a fuse, relay or wiring defect)

Posted on Sep 04, 2009

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1 Answer

Oil pressure gauge reading zero


check the oil pressure first, it should read around 10 to 14 psi. If pressure is inside the range then your pressure sensor is bad. If lower or reads 0 psi your got a engine problem, further diagnosis needed. Good luck.

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somewhere around 1.6 pounds (1lb.14ounces) of R134a if system is evacuated and 3 ounces of oil with new compressor.
keep pressure on the low side around 34-37psi & it should blow snow. Below are normal car AC pressure readings with 134A.
  • Normal readings on high and low side with AC OFF (static pressure) – Depends on outside temperature, but normally is between 80-105 PSI
  • Normal low side reading with AC on high speed and MAX & engine at 800-1000 RPM’s – Ranges from 25-35 PSI –
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Don’t assume that if adding little Freon is good that adding a lot is better! Overcharging just a little can decrease the performance of the system and possibly damage the compressor.
DIY recharge kit:
With the AC on the coldest setting, use a thermometer in a middle vent. Normal vent temperature readings will vary depending on the (ambient) outside temp. The vent temperature should range from around 42-55 degrees in my experience. If normal gauge readings are obtained and the vent air is cold – STOP don’t overcharge the system.
Thank you for using fixya and be safe.

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