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Hello, just want to throw in my 2 cents...Grand Cherokee with hydraulic fan...there is no relay...the PCM controls it. The PWM relay is for electric fan.
Here's the pin-out info:
DATE: Dec. 16, 2002
This bulletin is supplied as technical information only and is not an authorization for repair. No part of this publication may be reproduced, stored in a retreival system,
or transmitted, in any form or by any means, electronic, mechanical, photocopying, or otherwise, without written permission of DaimlerChrysler Corporation.
THIS BULLETIN IS BEING PROVIDED IN ADVANCE. DO NOT ORDER PARTS OR
PERFORM ANY ACTIONS RELATED TO THIS BULLETIN UNTIL JAN. 20, 2003.
Newly Released Solenoid For DTC P1499 - Hydraulic Fan Solenoid Circuit Fault
This bulletin involves the replacement of the hydraulic fan solenoid instead
of the complete cooling fan module.
2001 - 2004 (WJ) Grand Cherokee
2001 - 2004 (WG) Grand Cherokee (International Markets)
NOTE: THIS BULLETIN APPLIES TO VEHICLES EQUIPPED WITH A HYDRAULIC
COOLING SYSTEM (SALES CODE NMH).
The customer may experience a MIL illumination due to DTC P1499 - Hydraulic Fan
Solenoid Circuit. The MIL illumination may occur intermittently.
1. Proceed with this bulletin only if the cause of the MIL illumination is due to
DTC P1499 - Hydraulic Fan Solenoid Circuit Fault.
2. Refer to the 2002 or later Jeep Grand Cherokee - Powertrain Diagnostic
Procedures Manual to properly diagnose DTC P1499.
3. If the diagnostic procedures determine that the hydraulic fan solenoid is
at fault, then perform the Repair Procedure.
NOTE: THE HYDRAULIC FAN SOLENOID LISTED BELOW HAS BEEN RELEASED
AS A SEPARATE ITEM. THE COMPLETE HYDRAULIC FAN MODULE NO LONGER
REQUIRES REPLACEMENT WHEN ONLY THE SOLENOID IS FOUND TO BE AT FAULT.
Qty. Part No. Description
1 05102210AA Solenoid, Hydraulic Fan
CH6000 Scan Tool (DRB III®)
CH7000/7001 J1962 Cable
1. With the engine off, disconnect the negative battery cable from the
negative battery terminal.
2. Raise the vehicle on a suitable lift.
3. Clean the immediate area around the hydraulic fan solenoid of any debris.
4. Disconnect the electrical harness from the hydraulic fan solenoid (Fig. 1).
Fig. 1 HYDRAULIC FAN MODULE / SOLENOID
1 - Crankshaft Pulley
2 - Ground Strap Retention Nut
3 - Ground Strap (Must Be Connected To Fan Module)
4 - Hydraulic Fan Solenoid Electrical Harness/Connector
5 - Hydraulic Fan Solenoid (Serviceable Separately)
6 - Hydraulic Fan Module
5. Have the new hydraulic fan solenoid ready for installation. Make certain that the two
o-rings are in place. Notice that the armature of the solenoid can rotate within the body
of the solenoid (coil). A T40 torx bit is used for removal and installation (Fig. 2).
Fig. 2 HYDRAULIC FAN SOLENOID
1 - Solenoid Armature (rotates within solenoid coil/housing)
2 - Solenoid Coil / Housing
3 - T40 Torx Fitting
4 - Solenoid Electrical Connector
5 - Two Sealing O-Rings on Armature
NOTE: IF THE SOLENOID REMOVAL AND REPLACEMENT STEPS ARE PERFORMED
QUICKLY, THEN ONLY A VERY SMALL AMOUNT OF STEERING FLUID WILL
DRIP FROM THE FAN MODULE HYDRAULIC FAN SOLENOID OPENING.
THE SMALL AMOUNT OF LEAKAGE SHOULD NOT REQUIRE PRIOR FLUID
REMOVAL FROM THE POWER STEERING RESERVOIR.
6. Hold the connector of the solenoid to prevent the solenoid body from turning, and
remove the hydraulic fan solenoid from the hydraulic fan module.
7. Immediately install the new hydraulic fan solenoid. Tighten the
solenoid to 16.2 Nm (12 ft. lbs.).
8. Connect the electrical harness to the hydraulic fan solenoid.
NOTE: IF FOR ANY REASON DURING THE REPAIR PROCEDURE THE
ELECTRICAL GROUND WIRE IS REMOVED FROM THE HYDRAULIC FAN
MODULE ASSEMBLY, THEN RECONNECT THE GROUND WIRE AND TIGHTEN
THE RETENTION NUT TO 10 NM (7.4 FT. LBS.). FAILURE TO ENSURE THE
GROUND STRAP IS PROPERLY CONNECTED COULD RESULT IN ELECTROSTATIC
DISCHARGE THAT MAY DAMAGE THE PCM.
9. Lower the vehicle.
10. Connect the negative battery cable to the battery negative terminal.
11. Verify the fluid level in the power steering reservoir. Top off the fluid level as necessary.
Reimbursable within the provisions of the warranty.
08-30-18-91 Replace Hydraulic Fan Solenoid 0.4 Hrs.
ML Check Engine / Service Engine Soon
no cold air blowing out when ac is on but low pressure