Both High- and Low-pressure Sides are Too Low

WARNING: This page is about a different car, the 2005 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.

PROBLEM SYMPTOM TABLE - AC SYSTEM (BOTH HIGH- AND LOW-PRESSURE SIDES ARE TOO LOW)

Gauge indication	Refrigerant cycle	Probable cause	Corrective action
Both high- and low-pressure sides are too low.	There is a big temperature difference between receiver drier outlet and inlet. Outlet temperature is extremely low. Liquid tank inlet and expansion valve are frosted.	Liquid tank Inside is slightly clogged.	Replace liquid tank. Check lubricant for contamination.
	Temperature of expansion valve inlet is extremely low as compared with areas near liquid tank. Expansion valve inlet may be frosted. Temperature difference occurs somewhere in high-pressure side.	High-pressure pipe located between receiver drier and expansion valve is clogged.	Check and repair malfunctioning parts. Check lubricant for contamination.
	Expansion valve and liquid tank are warm or only cool when touched.	Low refrigerant charge. ↓ Leaking fittings or components.	Check refrigerant system for leaks. Refer to "Checking for Refrigerant Leaks ".
	There is a big temperature difference between expansion valve inlet and outlet while the valve itself is frosted.	Expansion valve closes a little compared with the specification. ↓ 1. Improper expansion valve adjustment. 2. Malfunctioning expansion valve. 3. Outlet and inlet may be clogged.	Remove foreign particles by using compressed air. Check lubricant for contamination.
	An area of the low-pressure pipe is colder than areas near the evaporator outlet.	Low-pressure pipe is clogged or crushed.	Check and repair malfunctioning parts. Check lubricant for contamination.
	Air flow volume is too low.	Evaporator is frozen.	Check intake sensor circuit. Refer to "Intake Sensor Circuit ". Replace compressor.