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One question- 2002 Chrysler Town Country van. A/C Not cold.

Hello one question- 2002 Chrysler...
Hello one question- 2002 Chrysler Town Country van. A/C Not cold. connected gauges and it does show to have freon. Checked power at pressure switch no power. switch is a three prong wire.
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Answered in 21 minutes by:
6/6/2017
Edward
Edward, Technician
Category: Chrysler
Satisfied Customers: 3,567
Experience: I have over 20 years experience in the automotive service industry.
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Hello, and thanks for your question, my name is ***** ***** I will do all I can to help.

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Can you tell me if fuse 18 out under the hood, (blue 15 amp) is good and has power to it with the key ON?

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Customer reply replied 10 months ago
Thank you for answering. yes fuse does have power as well as a/c clutch relay

If you pull the relay out and jump 30 to 87 in the relay socket, does the A/C clutch cycle then?

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Customer reply replied 10 months ago
okay. yes clutch cycles

OK that's good, Do you have a digital volt meter by chance?

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We need to check 5 volt reference signal to the PINK/YELLOW wire in that 3 wire sensor . should have 5 volts on when measured with red lead on PINK/YELLOW and black lead on NEG. battery terminal or some good clean engine metal.

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You have a PINK/YELLOW wire in the harness that goes to the 3 prong switch right?

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Customer reply replied 10 months ago
5.48v

Alright, that is good.

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the BLUE/GREEN wire, see if you have 5 ohms or less straight to ground.

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Did you try another relay by chance? in the power distribution box?

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If not, plug up your 3 prong switch and swap the AC relay with the horn or turn signal relay, ( I think one of them is the same relay) and see if it works then. Let me know what happens.

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Customer reply replied 10 months ago
2.04 to 0.00 ohms.. I swapped relays and started it but clutch does not engage

OK, that is right, it's got reference voltage from the ECM, and it's got ground, the other wire goes back to the ecm, did you try another switch yet?

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Customer reply replied 10 months ago
Three prong switch?
Customer reply replied 10 months ago
can i jump that three prong switch and see if clutch engages? just to rule out switch.

Right, let me post the wiring diagram, is it 3.3 or 3.8L? and is it automatic climate control or manual climate control? manual will have red/blue colors I believe and automatic will have numbers.

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Customer reply replied 10 months ago
3.8L
Customer reply replied 10 months ago
Automatic. Display window
Customer reply replied 10 months ago
I have not tried another switch yet. does system need to be evacuated to replace switch?

No it's got a schrader valve on it.

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just unscrew it quick.

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Customer reply replied 10 months ago
must be a low pressure switch then

It's a 3 wire transducer, so you can't just ground it, it's a varying signal to the PCM, I don't want to tell you to start jumping anything there because it could possibly cause some damage to the PCM, Here is the wiring diagram.

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wiring diagram.

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Customer reply replied 10 months ago
let me run to autozone right quick (4 blocks away) and buy a switch. i will get back with you

disconnect neg. battery cable and unplug and plug back in the PCM a few times. make sure no corrosion or bad connection there. measure pin 1 to pin 2 on the sensor itself when it's unplugged, (that would be PINK/YELLOW to BLUE/GREEN) make sure it's not completely open. Let me know what happens.

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If PINK/YELLOW to BLUE/GREEN pin on the transducer is completely open, it's bad transducer. (or 3 prong switch)

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Customer reply replied 10 months ago
Replaced switch. compressor still not engaging
What kind of scan tool do you have? Can you check codes in the climate control system?
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Customer reply replied 10 months ago
snap on solus ultra... one question, do you think i might be low on freon?
Customer reply replied 10 months ago
would it be okay to jump at relay just to see pressures and see if im low?
But don't run it long if the fan doesn't come on. Watch your high side over 250 psi
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Can you check climate control module codes?
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I'm gonna have to grab some dinner, will be back asap. Let me know what happens.

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Customer reply replied 10 months ago
Relay jumped. low side 47psi high side 247psi ambient temp. 89
That's good, cold inside right?
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Customer reply replied 10 months ago
but works only with jumper. when i put relay back on compressor does not engage
Customer reply replied 10 months ago
Also fans come on right away with jumper. not with relay on but of course it probably has not reached a certain temp... But yes right away with jumper
Unplug and plug in the ECM a few times, the ECM grounds the relay, so 1 pin in the relay socket should be grounded when you cut the air on. Check the diagram for wire color.
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Customer reply replied 10 months ago
Where is the ecm?

The Light BLUE/ORANGE wire that goes from pin 64 from the ECM is supposed to ground the A/C relay at 85. So if you want to unplug the ECM and find the Light BLUE/ORANGE wire, it should read less than 5 ohms to pin 85 in the relay socket.

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Customer reply replied 10 months ago
oh its that big block attached to the fuse box? with two multy wire connectors?

That's it. sorry about that delay I had a birthday party at a restaurant and had to drive back and only had cell service. thanks.

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Customer reply replied 10 months ago
ok. let me unplug both multi wire connectors to find that light blue orange wire.
Customer reply replied 10 months ago
Is it on the top connector or bottom?

If you can see it in the harness, leave it plugged up and see if you get a ground on it when you cut the air on, by putting your red lead on battery positive terminal and your black lead through the wire somewhere. If you do and you don't at the relay socket, that wire is broken between relay socket and the ECM, if you don't get a ground at all, then Either the A/C control panel is bad and not sending a signal that your requesting the air conditioning, or the ECM is bad. Because we've checked everything else.

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Customer reply replied 10 months ago
ok let me go check on that
Customer reply replied 10 months ago
ok connected ohm meter to pin 64 and pin 85 at relay socket and nothing
Customer reply replied 10 months ago
Its getting late. This is leading me to a broken wire i believe. i will stop for today and continue in the morning.

That is BLUE and ORANGE right? I gotcha, If your showing open circuit though, that's gonna be the culprit run you a new wire from 3 or 4 inches back from the ECM and 3 or 4 inches back from the relay socket and it maybe will fix it, or try to find the break measuring 2 or 3 inches at a time from pin 64 to back in the harness by poking through it slightly to hit the wire 2 inches at a time. Thank you.

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Customer reply replied 10 months ago
Ok this morning i got behind relay box and ohmd light blue wire with orange with light blue with orange at ecm and yes its showing connectivity. Then i plug connector back behind relay box and check at pin 85 and nothing
Customer reply replied 10 months ago
i think you read the wiring diagram better than i do, so im going to ask you are you sure its pin 85?

So your showing an open circuit between pin 85 in the relay socket, (with the relay removed) and pin 64 at the ECM ?

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Customer reply replied 10 months ago
correct

It is definitely 85 on the relay that goes to the ECM that gets a ground when the air compressor is supposed to cut on.

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OK then that is a problem, If you restore the connection between 85 in the relay socket and pin 64 at the ECM, then I believe you will get your compressor function back.

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Customer reply replied 10 months ago
I do get a reading behind the box at connector but not on top at socket

Is that fuse box all moulded together like the new ones are? or can you turn it over and see where the wires go into the relay socket pins?

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check all the relay sockets for a reading. just to make sure your not confusing 85 with any of those other pins in that A/C relay socket, you are 100% sure your checking the A/C relay correct? just wanna make sure.

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Customer reply replied 10 months ago
Unfortunately its molded. With about 8 multi wire connectors
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It's sounding to me like your going to need that entire fuse box. From what your reading it sounds like to me it's got an open circuit in it.

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If you check the resistance between the pin where BLUE/ORANGE plugs in at the bottom that goes to the ECM and pin 85 in the A/C relay socket and show more than 5 ohms, It's gotta be open in the box. Right?

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Customer reply replied 10 months ago
From bottom of box to top no reading
Customer reply replied 10 months ago
bottom of box pin on box to top relay socket no reading

I follow you, you might could run jumpers from the relay socket to the bottom of the relay to give you enough room to run a new wire to pin 85 from the ECM, but I think it would be easier just to put a another fuse box on it.

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Customer reply replied 10 months ago
Good idea. Some way i need to keep these people going. They"re from out of town and want to leave this afternoon
Customer reply replied 10 months ago
Fuse box expensive?
Customer reply replied 10 months ago
okay. I hate to log you out just yet because you have been of great help. You already deserve an excellent reading but could you hang around for me just in case i need you later on?

Absolutely, let me know what happens for sure.

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Customer reply replied 10 months ago
i ran a wire from bottom of box to top (relay socket) pin 85 but still no compressor
Customer reply replied 10 months ago
i do see a module attached to fuse box though

Do you get a ground on that BLUE/ORANGE wire coming right out of the ECM when you turn the air on? should read 12 volts if you measure it between battery power. If you do get a ground there, then that is all you need to ground the relay and get power to the compressor, you jumped the relay and the compressor ran, so make sure the relay is good.

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Your sure you ran it to pin 85 on the relay correct?

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Customer reply replied 10 months ago
ok its always grounded. 12.5 with key off and 11.9 with key on

The BLUE/ORANGE wire out of pin 64 on the ECM should only be grounded when the air is turned ON, if the air is turned OFF, it shouldn't be grounded. make sure the defroster isn't on and the panel is off.

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Customer reply replied 10 months ago
Double checked a/c panel and everything is off. Still ground at blue orange wire under box

if you disconnect it from the ECM does it still show a ground? I wouldn't think so. per the wiring diagram, it should not be grounded all the time, otherwise the air comrpessor would run all the time.

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Customer reply replied 10 months ago
Unplugged from ecm its 10.8v Plugged at ecm backprobed 12v

Interesting, if you unplug it from the fuse box and the ecm you don't get anything right?

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Customer reply replied 10 months ago
from ecm to bottom of box theres continuity
Customer reply replied 10 months ago
Owner says when a/c stopped working was after one time he bottomed out on a low spot on the road
Customer reply replied 10 months ago
He must of been running from the cops or something. For a damage like this. Not even a pregnant women suffers that much inflamation.

Oh jeez, that ECM should ground that wire when the A/C is selected. that is what grounds the relay. If it doesn't, then either the control panel or the ECM is bad or something else weird is going on. what's odd is the fuse box is open from where that wire connects at the bottom to 85 on the relay. So I don't want to say it has 2 problems but from what your telling me it seems like it does.

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Customer reply replied 10 months ago
I already priced the fuse box and module attached to it with chrysler dealer. And they were $589 each.. Owner already diclined to proceed

I follow you, send it down the road then correct?

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Customer reply replied 10 months ago
Well Eddy it has been a pleasure talking with you. You are a great man. You did your best in helping me solve this problem. hope you help me out again since i do request for help frequently. you deserve a excellent rating

Absolutely, Thank you and best wishes.

Edward
Edward, Technician
Category: Chrysler
Satisfied Customers: 3,567
Experience: I have over 20 years experience in the automotive service industry.
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