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Beause it needs to maintain the temperature selected. It goes on to cool the air, then it turns off when it is at the optimal temperature. When the air warms up again, it turns back on
The temperature in the air gets cool enough, so its thermostat turns the AC off. When it warms enough, the thermostat turns it back on.
possibly change the temperature sensor???
It is due to a thermostat. This is a switch that senses a change in temperature. When it gets cold, it turns on the heater. When it warms up, it turns off.
It pulls the top plate on the carburetor open just enough to stop the engine from flooding and keeps the fuel mixture rich enough to stop the engine from dieing in cold weather untill the engine temperature warms up.
Hi, The "easiest" way to see if the sensor is bad is to connect a scan tool to the van that is capable of reading and displaying the engine coolant temperature. If it appears to be changing in a reasonable way (goes up as the engine warms up, goes down as the engine cools), then the sensor is probably OK. If you do not have a scan tool, then you could use a multimeter to actually measure the sensor values (resistance) as the temperature of the engine changes. Just set the multimeter to the Ohms or Resistance scale, and check the values of the sensor when the engine is cold and as it warms up. Again, this value should change as the temperature changes. I have included a link that shows the location of this sensor (look at the bottom row of pictures). Good Luck, Greg
A common problem on various ford models is distrbuter module cutout when the car warms up. This will kill the engine and it will not fire until the car cools. The module is the chip attached directly beneath the distrubuter. Replace the module and this stands a good chance of fixing the problem :)
This answer is not specific to your vehicle, but coolant temperature sensors function the same on most types of vehicles, so if you suspect a faulty coolant sensor, then you must have a vehicle using more fuel than is normal. The most obvious check if access is possible is to put a voltmeter on the terminals and measure the voltage as the engine warms up, most give a high voltage from cold which reduces as the engine warms up.
Often a knock when cold is caused by piston slap, which is pistons rocking in the cylinders until they expand in size when the engine warms up.
It could be the temperature sensor you would have to see what code is tripping.
You wouldn't happen to be using too heavy of an engine oil ? What grade of engine oil are you using ?
No, warn engine parts will cause loss of oil pressure as the engine warms up, due to expansion betweeen moving parts. Hot oil is thinner.