![]() ![]() By "age", I mean look at how many times the car has gone from cold to operating temp and back to cold since new? Each time the cold, hot, cold cycle happens that's another strike on the head gasket becuase if contracts, expands, contracts, expands. Usually a head gasket fails if the car overheats or if the gasket begins to show age. Headgaskets usually fail for two reasons, one main reason is. I would say if the system held pressure for 2 hours with no drop, you could probably rule out the head gasket. Yes, even if you had a slight leak, after 2 hours you would most definately show a drop in pressure. I know I may be beating a dead horse here, but there are some very tiny ones that everyone neglects due to the space in which there is to change them. If that 137 comes up to the 150ish range, chances are the rings are starting to wear.Īs far as the small coolant leak goes, I would check any and ALL coolant hoses, especially the ones by the Turbo. 2 is give a squirt of oil or two down the cylinder and retest. So cylinder 2 is at around a 10% loss compared to the other ones. I see that 4 out of 5 cylinders at just about even with Cylinder 2 being a little bit on the low side.Ī 20% drop from the 150's would leave you around the 124 mark. However, the "space" if you will, between the coolant overflow, overflow hose, and the top of the radiator itself will utilize some coolant when pressure is applied to the system.Ī general rule of thumb is no more the a 20% differnece in compression readings bewtween cylinders. If the message comes after you have installed the sensor - there is a possibility of a coolant loss.You are correct, you cannot compress a liquid. Please understand that the sensor is monitoring coolant level and sending you a message that there is an issue. Please understand that the actual design of the sensor may differ from the picture that you see. If your vehicles engine is overheated- it has to be replaced first. Please UNDERSTAND - this is NOT a repair solution for OVERHEATED engine. You will have a low engine coolant warning system on your Volvo after installing this upgrade kit. We are proud to offer this solution to you. ![]() It is UNFORTUNATE, but many of our customers have had to deal with the cost associated with complete engine replacement due to loss of coolant and engine OVERHEATING. From the day these models were introduced to the USA market- there has been an issue since there is no factory installed low coolant warning system. We designed and developed this upgrade kit so that you can have an early LOW ENGINE COOLANT warning system installed on your Volvo models mentioned above. Install the expansion cap back into the coolant expansion tank - we are back to normal operating conditions. The Radiator Cooling fans will be operating at full speed. The red exclamation sign below that green text board will illuminate. The message display will show HIGH ENGINE TEMP. The Sensor is equipped with the device that will signal the vehicle computer and warn the driver of the LOW coolant level by one the following signs: ![]() Carefully Unscrew the cap with the sensor from the coolant expansion tank, allowing the sensor's float to drop to the signal point. THE TEMPERATURE SENSOR ON THE THERMOSTAT HOUSING IS HIDDEN AWAY. PLEASE NOTE - TURBOCHARGED ENGINES REQUIRE REMOVAL OF THE AIR FILTER BOX HOUSING. You can install this upgrade kit in less than 5 minutes, without visiting a repair facility or service garage.ġ) Simply remove the coolant expansion tank cap- MAKE SURE THAT THE ENGINE IS COLD!!Ģ) Install new replacement cap with the sensor into a coolant reservoir tank ( make sure the coolant level us up to the FULL line)ģ) Locate the coolant thermostat housing on your engine ( we include instructions - showing where it is- please look at the pictures with instructionsĤ) Disconnect gray color electrical connector from the coolant temperature sensor.ĥ) Install larger Plug of the new low coolant sensor system harness onto the coolant sensor on the thermostat housing,Ħ) install smaller plug of the new low coolant sensor system harness into the GRAY coolant temperature sensor harness plug at the vehicles engine wire harness. This is an upgrade kit for vehicles that do not have a low coolant warning system installed. Volvo S40 2004-2011 with 5 cylinder 2.5 and 2.4 gasoline engines,
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