AC compressor not turning on
04-28-17, 07:34 PM
#1
AC compressor not turning on
I have an 07 250 and just discovered my AC isnt blowing cold air. I cant seem to hear the compressor kick in either. Drove the car for about 15min to and from dinner tonight. Was wondering if anyone ever had the same issue and can give me some advice? Ive never had to have an AC recharge on any of my cars so i dont know the symptoms. Hopefully this isnt to much of an expensive fix. Thanks
04-30-17, 07:33 AM
#3
If the a/c compressor isn't kicking on it is usually due to the pressure sensor, or being too low on refrigerant. It will kill the compressor to run it dry, so the pressure sensor will only allow it to kick on if it the pressure is within the required tolerance. So if the sensor is dead or the pressure seeped out, it will not cycle. Have you popped the hood and physically looked to see if it's coming on? It's in the lower right corner of the engine when facing the engine bay.
It's really hard to say what could be wrong with it without hooking up a manifold to the system and testing the sensor.
It's really hard to say what could be wrong with it without hooking up a manifold to the system and testing the sensor.
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Olarewajum (09-09-21)
04-30-17, 08:56 AM
#4
If the a/c compressor isn't kicking on it is usually due to the pressure sensor, or being too low on refrigerant. It will kill the compressor to run it dry, so the pressure sensor will only allow it to kick on if it the pressure is within the required tolerance. So if the sensor is dead or the pressure seeped out, it will not cycle. Have you popped the hood and physically looked to see if it's coming on? It's in the lower right corner of the engine when facing the engine bay.
It's really hard to say what could be wrong with it without hooking up a manifold to the system and testing the sensor.
It's really hard to say what could be wrong with it without hooking up a manifold to the system and testing the sensor.
04-30-17, 09:55 AM
#6
If the a/c compressor isn't kicking on it is usually due to the pressure sensor, or being too low on refrigerant. It will kill the compressor to run it dry, so the pressure sensor will only allow it to kick on if it the pressure is within the required tolerance. So if the sensor is dead or the pressure seeped out, it will not cycle. Have you popped the hood and physically looked to see if it's coming on? It's in the lower right corner of the engine when facing the engine bay.
It's really hard to say what could be wrong with it without hooking up a manifold to the system and testing the sensor.
It's really hard to say what could be wrong with it without hooking up a manifold to the system and testing the sensor.
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04-30-17, 04:44 PM
#8
If the a/c compressor isn't kicking on it is usually due to the pressure sensor, or being too low on refrigerant. It will kill the compressor to run it dry, so the pressure sensor will only allow it to kick on if it the pressure is within the required tolerance. So if the sensor is dead or the pressure seeped out, it will not cycle. Have you popped the hood and physically looked to see if it's coming on? It's in the lower right corner of the engine when facing the engine bay.
It's really hard to say what could be wrong with it without hooking up a manifold to the system and testing the sensor.
It's really hard to say what could be wrong with it without hooking up a manifold to the system and testing the sensor.
05-01-17, 05:20 AM
#9
Super Moderator
Cheapest, maybe, but certainly not the right way to do it. If his refrigerant is indeed low, the correct thing to do is to find and fix the leak, then use a vacuum pump to remove all of the air and moisture from the system, and only then recharge it.
05-01-17, 10:18 AM
#10
Agree with Bichon.
When I had a/c problem, everything inside looks normal except no cold air.
Did a leak check and compressor is seized and leaking from shaft seal.
Replaced myself and charged at a shop and all is good.
When I had a/c problem, everything inside looks normal except no cold air.
Did a leak check and compressor is seized and leaking from shaft seal.
Replaced myself and charged at a shop and all is good.
05-01-17, 06:54 PM
#11
Best case scenario is that if that does "fix" it, it will just eventually leak back out and you'll be right back where you started.
07-17-18, 12:38 AM
#12
Driver School Candidate
----(SOLUTION) —— I posted this in another thread but i thought it would help in this one too.
My Lexus IS250 2007 did the same thing. My AC compressor was cycling on and off. It got hot outside (95F) and it would only turn on a few seconds (about 5 sec) at 20 second intervals and would eventually stop cycling.
Solution (how i fixed the problem):
-when I checked my freon pressure was in the red (high pressure).
-I recovered freon from the low pressure valve to decrease the pressure.
-Did this until the compressor stayed on.Then made sure it stayed in the green.
My Lexus IS250 2007 did the same thing. My AC compressor was cycling on and off. It got hot outside (95F) and it would only turn on a few seconds (about 5 sec) at 20 second intervals and would eventually stop cycling.
Solution (how i fixed the problem):
-when I checked my freon pressure was in the red (high pressure).
-I recovered freon from the low pressure valve to decrease the pressure.
-Did this until the compressor stayed on.Then made sure it stayed in the green.
Last edited by PalmTreez; 07-17-18 at 05:05 PM. Reason: worded the steps incorrectly
07-17-18, 12:57 PM
#13
^^ One has to wonder how it got "over charged" to begin with. It didn't do it to itself!
If you're going to dabble, buy a proper gauge set and set the pressures per the ambient temperature pressure chart for high/low side pressures.
If using a new gauge set be wise and purge the air from those new hoses or they take the moisture and air suck it right into your system which degrades your charge!
If you're going to dabble, buy a proper gauge set and set the pressures per the ambient temperature pressure chart for high/low side pressures.
If using a new gauge set be wise and purge the air from those new hoses or they take the moisture and air suck it right into your system which degrades your charge!
07-17-18, 05:08 PM
#14
Driver School Candidate
The next day my compressor stayed on for about 10 min then started to blow hot air. I may have a leak in my system. Going to try to find out where the leak is. May have bumped my AC line (next to the alternator) and air may be getting into my system. Will update when problem is solved!