17 crv ac blows warm no clutch engagement and fans dont come on

I have a 16 crv where my a/c recently stopped working out of nowhere. I found out the the compressor wasnt coming on but also noticed the fans did not come on with the a/c switch on. Upon looking at a wiring diagram I came to the conclusion that i needed a clutch and coil because i was receiving the power command on the compressor to come on but now i am thinking i need a whole new compressor with clutch and coil because of the fans not coming on too.So my main question is can a faulty thermo switch inside the compressor cause the fans not to come on and how can i test the thermo switch?

So my main question is can a faulty thermo switch inside the compressor cause the fans not to come on and how can i test the thermo switch?

To answer your question directly, no, an open thermo switch will not cause a lack of fan operation. Not in my experience, anyway. Plus, you said you had power to the compressor clutch, right? The ECM won't power the compressor clutch unless the thermo switch is intact.

The problem is, I can't see that your CR-V compressor has a thermo switch at all. Older model CR-V's had thermo switches in the compressors, but not this one. I've checked the OE diagrams. The 2.4L engine compressor has one wire going to the clutch. The 1.5L option has one wire for the clutch, and two wires for the variable displacement solenoid. No thermo switch in either one.

Either way, if you have 12V at the compressor clutch with no clutch engagement, then you're done, IMO. Clutch or compressor time. Which one I'd do would depend on the cost of the parts, and if I could change the clutch without putting it out of the vehicle.

The lack of fan operation is more likely a symptom of the compressor clutch. With no clutch engagement, there's no rise in A/C high side pressure, which is what the ECM is watching to decide when to turn the fans on.

So your saying a clutch not engaging can cause the fans not to work? I attached the oe wiring diagram to this message and please if you don’t mind what do the other two wires exactly do then one goes to the micu and the other to the climate control

ubnizmo4 wrote:

So your saying a clutch not engaging can cause the fans not to work?

If the A/C high side pressure doesn't go high enough for the ECM to judge that the fans are needed, yes.

I attached the oe wiring diagram to this message and please if you don’t mind what do the other two wires exactly do then one goes to the micu and the other to the climate control

Are you sure that's for a 2017 model year? This is what I find for a '17 1.5L:



And this is what I find for a 2.4L:



However, the 2016 model year diagram looks like yours:



Are you positive you've got the right diagram? Are you sure your CR-V is a 2017? :huh:

My fault yes it is a 16 crv. What has me questioning your reply about the clutch not engaging causing fans not to work is ive had other hondas with no clutch operation but the fans would still come on

ubnizmo4 wrote:

My fault yes it is a 16 crv.

Ahhhhhh OK, good to know. Thank you for updating the thread title.

What has me questioning your reply about the clutch not engaging causing fans not to work is ive had other hondas with no clutch operation but the fans would still come on

Now that I know there's a thermo switch involved, yes, the switch is involved in the cooling fan operation.

However, I'm inclined to believe that the thermo switch is fine, because the ECM wouldn't be powering the compressor clutch without it.

Are you sure about your 12V reading for the compressor clutch? With an incandescent test light connected to B-, does the red/white wire light up with the engine running and the A/C on?

yes back probed that red/white wire with engine running a/c on and the test light lit up (used the otc test light pretty sure it is incandescent )

ubnizmo4 wrote:

yes back probed that red/white wire with engine running a/c on and the test light lit up (used the otc test light pretty sure it is incandescent )

Perfect. TBH, I think you're done. Clutch time. If there were a problem with the thermo switch circuit, the ECM wouldn't be powering the compressor clutch.

For that 110% confidence, I looked through the A/C troubleshooting options and found this:



Again, if the A/C pressure sensor or the evaporator temperature sensor had failed or were reading incorrectly, the clutch wouldn't be getting powered.

You can also ohm check the switch itself for continuity:

So i did see that in honda service information about the a/c pressure switch and or evaporative temperature sensor. What i can tell you is that on the scan tool the a/c data looked fine except one which was a/c temperature sensor which was around 400 degrees F. This is confusing for me because i dont know exactly what to check after because i have no codes for those sensors but i do have power going to the compressor. I wish honda service information was more clear but for me everything there is too vague. Anyways thanks for your help and quick replies

No problem, let me know if you have more questions.