Question about Cars & Trucks

1 Answer

2002 hyundai xg350 a/c will not engage

A/c is full charge but clutch will not engage will engage if relay is grounded,but then cooling fans will not turnon for condensor

Posted by tom palansky on


1 Answer


  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Top Expert:

    An expert who has finished #1 on the weekly Top 10 Fixya Experts Leaderboard.


    An expert that got 20 achievements.


    An expert that got 10 achievements.

  • Cars & Trucks Master
  • 21,873 Answers

The engine computer controls the ground signal going to the ac relay as well as the fan relays. You'll need a shop manual to get the testing procedures for the HVAC system. It could be one of the pressure switches or something else.

Posted on Jun 29, 2013


4 Related Answers


Paul McGrath

  • 776 Answers

SOURCE: ac compressor will not engage 2003 hyundai xg 350

You found the problem (lost ground on relay)... Fix it! You solve this problem yourself.

Posted on Jun 02, 2009


Duane Wong

  • 6826 Answers

SOURCE: Cooling fan doesn't come on when A/C compressor is

OK, if there is no ground for the relay coil then the harness needs to be taken apart and the break in the wire repaired.

Or, if the system is normally grounded except through the a/c climate control circuit, then you might try grounding the relay directly or permanently (this is only if the schematic says that the relay is normally grounded, and the positive is controlled by the hvac system.)

Hope this helps.

Posted on Jul 13, 2010


ZJ Limited

  • 17970 Answers

SOURCE: air conditioner clutch does not

P0645 - A/C Clutch Relay Control Circuit
Means that an open or shorted condition detected in the A/C clutch relay control circuit.

If you replaced and check some components... Does the a/c clutch relay click when you turn the a/c relay on? It sounds that you have some kind of a module communication issue. It could be caused if one of your control modules is faulty and pulls all the network down. You should have your vehicle scanned with a scan tool that has access to other electronic modules ( ABS, Air bag, BCM). A DRB III scan tool has these capabilities.
Keep us updated.

Posted on Aug 03, 2011



  • 85239 Answers

SOURCE: a/c wiring diagram for 2006 jeep liberty sport

I am sorry but fixya has no wiring diagrams for any car or truck. I suggest you try this site

Posted on Apr 13, 2012

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

2004 Hyundai xg350. Wipers quit working. What steps do i take to see if its a motor or fuse etc.?

Search Results

    02 XG350 air, sunroof, seat warmers, and intermittent wipers quit ...

    Sep 27, 2012 - 9 posts - ‎5 authors
    An automotive shop pulled up the car and said their was a fuse box with a lot of relays in it on the passenger compartment .... 2004 XG350L .... Same thing happened to me, 2002 XG350, sunroof, blower, vanity light all out.

    Hyundai XG350 wipers not working Questions & Answers ... > ... > wipers not working > Cars & Trucks > Hyundai
    Hyundai XG350 cars & trucks wipers not working questions and answers. Ask your Hyundai wipers not working related question. ... 2004 Hyundai XG350.

    Hyundai wipers not working Questions & Answers - Fixya

Dec 03, 2015 | Hyundai Cars & Trucks

1 Answer

My cooling fan will not turn off. 2001 Hyundai Elantra GLS 2.0 l engine

1. Check the scan data for engine temperature to see if it shows that the engine is running hot. The ECM will turn the A/C relay off if it thinks that the engine is overheating. Check engine coolant temp sensor

2. Test voltage at the Powertrain Control Module (PCM) pin 50 (Yellow) and pin 58 Yellow/Black. Both should have battery voltage when the system is turned on and the engine is running. If not, then the wiring needs to be checked.

3. If battery voltage is present on the two pins, then manually ground pin 68 (Orange) at the PCM and this should ground the A/C relay and the clutch should engage.

4. If it does, verify that the PCM powers and grounds and connections are good.

Mar 27, 2015 | 2001 Hyundai Elantra GLS

1 Answer

Radiator fan relay control circuit 2002 dodge ram

low charge pressure of 134A Coolant will not let the fan or compressor clutch engage.

Apr 01, 2014 | Dodge Ram 1500 Cars & Trucks

1 Answer

A/c compressor won't engage and the cooling fan not operating

The cooling fan does not come on until the engine temp reaches 229 degrees. it is controlled by a cooling fan relay. Cheeck for power at the fan motor and check the relay. The A/C. If yuor a/c system is low on freon the low pressure switch on the accumulator will not complete the circuit for the clutch. Check the charge, voltage present at the clutch or the low pressure switch. You can install a jumper in place of the switch to test.

Mar 29, 2010 | 1989 Oldsmobile Cutlass Supreme

1 Answer

2002 Saturn SL2 A/C Not working.

I would test the A/C compressor clutch coil first , easiest to do . If the electromagnet clutch coil is bad ,the compressor won't engage . Pull the A/C compressor clutch relay an jump pin's 30 & 87 , where the relay plug's into the fuse box . If pin 30 has B+ voltage ,pin 87 sends that B+ voltage to energize the clutch coil . These clutch coil's can go bad . You could also check the cooling fan this way , pull the cooling fan relay an take a piece of wire an jump pin's 30 & 87 .If fan is good it will run . Do you know how relay's work ?
VEHICLE RELAYS Operation Diagnosis

The PCM controls both relay's by supplying a ground to energize the relay .
Is the check engine light on ?
Do you know what a wiring diagram is ? How to use one along with a DVOM - digital volt ohm meter to test automotive electrical circuits ? Not guessing ? This is how an automotive technician would solve this problem , hooking up a scan tool an checking for code's ,using bi-direction control of scan tool to manually try to turn on coolant fan ,A/C compressor .....
Free wiring diagrams here
Enter vehicle info. year , make , model an engine size. Under system click on engine ,then under subsystem click on cooling fans ,check the electrical circuit's .

Dec 17, 2017 | 2002 Saturn Sl

1 Answer

Ac compressor will not engage 2003 hyundai xg 350

You found the problem (lost ground on relay)... Fix it! You solve this problem yourself.

May 02, 2009 | 2002 Hyundai XG350

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

267 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cars & Trucks Experts


Level 3 Expert

85239 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22485 Answers

john h

Level 3 Expert

23424 Answers

Are you a Car and Truck Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides