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Willnot shut off keeps gaining pressure,leaks from under switch box as its running dont leak after you unplug it

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On my compressor, the pressure switch has a diaphram that moves with increased pressure to push the switch off. If yours is the same type, and the diaphram has a hole (maybe the leak you hear), it might not move far enough to push the switch off. Something to check. If you take the pressure switch apart, beware as there are springs and parts that will become instantly liberated, and they're difficult to reassemble.

Posted on Jun 24, 2009

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Compressor runs but only pumps 40 psi


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I have Bostich CAP2040-OF compressor that initially would not shut off after building pressure. I would let it build up until the needed pressure then shut it off for use then turn it back on etc. Now...


You could have a combination of both, but most likely worn cylinder. Easy to check. Remove cover, with compressor running spray soapy water on all fittings including under pressure switch. Repair as needed. If no leaks, unplug compresor from power and turn crank until piston is at top of stroke. Look for scratches / worn area close to top of cylinder. If worn, replace cylinder / piston ring (pressure is leaking past cylinder/ring). If it looks ok, then most likely problem is head gasket or reed valves. Parts are available at www.bostitch.com Good luck!

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Yes you have an oil pressure sending unit (switch) located under the manifold. They are known for going bad and leaking. Eventually it will prevent truck from running. When it stops sensing oil pressure due to the leak the vehicles fuel system will shut off. Its a saftey featur to keep you from blowing the motoe if a pump goes bad or you run outta oil

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I have a Porter Cable pancake air compressor CFFN 250N manufactured in 2004 that has an air leak. Pressure can only get to 80 PSI. Checked all the connections and found no leaks. Finally took the cover...


There is a check valve where the line goes into the tank. The purpose of this valve is to keep air from coming out of the input line. This valve is likely the culprit and it is leaking out of the unloader. The unloader is actuated by the electrical switch when the compressor shuts off, and it relieves the pressure on the line so that the pump is not under load when it tries to start.

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1 Answer

Where can i find the Low pressure switch on my 92 nissan pathfinder. and how can i check to see if its bad or switch it on?


The low pressure switch in an A/C system cannot be manually "switched" on or off.
most A/C systems have 2 switches. Both of these switches are "switched" by the pressure of the freon in the system.
One is located on the high side of the system, and the other is on the low side of the system. The one located on the high side is a normally closed switch that opens the A/C clutch circuit and shuts the compressor off when the high side pressure gets dangerously high - usually around 350 - 400 PSI. This keeps you from having an explosion in the event that the hoses become restricted for any number of possible reasons.
The low pressure switch opens the A/C clutch circuit and shuts the compressor off when there is not enough pressure on the low side of the system to safely operate the system. usually somewhere around 20 PSI. The compressor is oiled by oil circulating along with the freon in the system. If the freon leaks out, the pressure drops and the oil cannot circulate because there is not enough freon to push it through the system. So the low pressure switch shuts the compressor off to keep the compressor from blowing up due to oil starvation.
Failure of these switches is very rare. Almost every one that I have replaced was not because the switch didn't switch, but because it was leaking freon.
If your low pressure switch is keeping your A/C compressor from running, it is most likely that the system is either out of freon (due to a leak somewhere in the system) or because it is unplugged.
Your Nissan is equipped with a "Dual Pressure" switch. it does the job of both switches by opening under extremely high pressure as well as extremely low pressure conditions. it is located beween the front grill and the A/C condensor near the Accumulator just to the right (as you are facing the front of the car) of the right headlamp area. See picture.50e4218.gif To determine if this switch is functioning properly, you must hook-up an A/C pressure manifold gauge (to find out what the actual system pressure is) and use a volt/ohm meter to determine if the switch is opening and closing under the correct pressures.

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1 Answer

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If the pressure does not get pass 30 psi, then check for leaks along the pipelines and on the tank itself. An air leak on the top portion of the tank can cause the pressure not to trigger the pressure switch. Use soap bubbles to detect any air leak. Although a stuck pressure is not more likely the problem, check it also.

Aug 31, 2009 | Flotec 1/2 Hp Stainless Steel Waterfall...

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Makita MAC2200 runs fine (with new Manifold Switch and repaired power cord) but there is an air leak under the new manifold switch that seems to be a feature of the switch. When set to automatic, the...


I have worked on many makita compressors and have run-across this problem on a few of them. Your compressor has a check valve that is supposed to hold tank pressure after the switch reaches set pressure. There is an unloader valve built into the pressure switch that releases the pressure in the discharge hose after the unit shuts off. The unloader allows the compressor to restart with-out any pressure in the discharge line. If the brass check valve is leaking pressure back into the system, air will leak out of the unloader valve. Follow the discharge line to the tank and you will see the brass check valve. To test valve for fault, run the compressor till it builds around 80 psi and unplug the unit from the wall outlet. Remove the 1/4" hose connector from the check valve and check for air leaking out of the valve. If it is leaking you can order form www.toolpartsdirect.com. or call the makita 1-800 number. The price is about the same. Good Luck on your repair.

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