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Overpressure fault on system

I have a system that is shutting off due to overpressure on pressure switch

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I experienced twice an orange engine oil pressure warning light and after the car wont move. I switched off the car and after ten minutes it moved. what is the problem

While an electrical fault or a faulty switch could put the light on, it is such an important light it should never be ignored and the reason for it established immediately. As far as the owner is concerned that means lifting the bonnet and checking the oil level and adding more if the level is low. If it isn't low the car should be recovered to a repair shop. Driving further could be very expensive and very inconvenient...

If the oil pressure light has switched on because the oil pressure is low then continuing to drive will soon wreck the crankshaft bearings or cause crankshaft or camshaft seizure. Damage happens so quickly if the oil pressure is lost at motorway speeds the engine is likely to be severely damaged by the time the car is stopped.

I strongly suggest you have the reason for the light switching on established and repaired.

Apr 12, 2016 | Cars & Trucks

1 Answer

My a/c compressor is recycling and has plenty of freon in but won't blow cold air, what else do I need to check? thanks

it sounds like there is a blocked TX valve and the ac is going into overpressure and switching of until the system equalizes out to switch on again
Have it tested at an accredited ac shop

Mar 29, 2015 | 2003 Ford Escape

1 Answer


After the obvious, checking the oil level, the next step is to remove the oil pressure sensor and connect an oil pressure gauge. It sounds like you have already done this, so on to other things.

Try changing the oil filter in case it has a weak overpressure valve (meant to pass oil if the filter becomes blocked).

Some Camrys of this era suffered engine sludging, and if this has occurred it may have partly blocked the oil pickup in the sump.

After that suspect a faulty overpressure relief valve in the oil pump, or even a worn pump (this is rare in a 2007).

Worn big end and crank bearings will cause low oil pressure, but if that has occurred you would normally notice the engine burning oil (blue smoke). This and the oil pickup can be checked by dropping the sump, best done on a hoist.

Nov 05, 2012 | 2007 Toyota Camry

1 Answer

Air con turning on and off continualy, why and how do I fix it?

Well,this is usually caused by low freon pressure,and goes away when the car has freon added.Is it possible that you only got one can in there when you needed TWO or THREE?
I mean,it CAN happen on an OVERPRESSURE of the system(too much freon),but it's rare.
The last thing is that the switch could be bad(low-pressure cut-off switch).
If the pressure is checked with gauges and is within parameters, the switch might be bad.
There is also the possibility if it shows out of range pressures, that the dryer tank or orifice is plugged. don-ohio (:^)

Nov 17, 2011 | Cars & Trucks

1 Answer

Where is the low side pressure switch located for a 1993 chrysler concorde. Trying to engage the compressor clutch to fill with freon

If you fill it with freaon after evacuation the first charge at the pressure of the can is enought to close the switch if not theres a leak or something eles is wrong, The low side switch being crossed will speed things up but is'nt recomended as the freaon can freeze up as it forced charged and overpressure and hose or condender failure is'nt worth the faster speed of charging. A freaon charging station will fully charge the system without even starting the car.

Apr 03, 2011 | Chrysler Concorde Cars & Trucks

1 Answer

Oil cooler blew up.. what does it cost to replace?

Why did it blow up...corrosion or overpressure.? If it was overpressure you need a new oil pump too.

If it was corrosion you need someone to check to see if the oil filter mount is okay to receive a new cooler and 'O' ring.

Usually the 'O' ring gets hard and cracks letting oil escape. 'O' lives between the oil cooler and filter mount. Most shops can do the job and cost depends where you are but assume around $200 or so
labour and same for parts .. I did one recently and job ran $290.00 but I didn't need to check oil pressure or change oil pump because 'O' ring had split.

Common problem with oil cooler is internal corrosion and oil and coolant mixing.Results in Mayonnaise on the dip stick and oil filler cap..corrosion is caused by infrequent coolant changes and/or wrong coolant or too little coolant antifreeze.

Use a Prestone Universal Antifreeze for yours.

Jan 13, 2011 | 1997 Volkswagen Cabrio

2 Answers

Where is the radiator cap

The newer vehicles don't have radiator caps. There is an over flow resevour next to the radiator, typicaly heater hose size hoses going to and from it. On the top of this there is a overpressure cap that will relieve any extra pressure, this will be where you would refill the system at.

Hope helps (rememnber rated this).

Jun 25, 2010 | 2002 Saturn VUE

1 Answer

My engine coolant leaking from surge tank cap after my 01 corvette is turned off.

Sounds like you maybe overpressure in tank or overheating.could be faulty pressure cap

Aug 25, 2009 | 2001 Chevrolet Corvette

1 Answer

Toyota celica, air conditioner will not work, evac done and recharged, nothing, changed out low pressure switch and still nothing. switch on dash blinks when you press it, compressor tries to come but cuts...

Weird, usually the pressure cut out switch, if you manually "bridge" this (only briefly say 4 secs) the a/c should work, sometimes a plugged/blocked condensor or evaparator will cause this . Also look at engine related temp switches, example water, as these are designed to overide and turn off the ac if the car gets too hot etc.
1)Bridge switch
2) ? oil level in compressor (seized??)
3) temp switches,
4)double check that the system is not blocked, coz if it is then the compressor will only go briefly and then stop due to "overpressure"

Jun 16, 2009 | 2001 Toyota Celica

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