60603 - Jet Performance Products
Contents
1. 1992 Corvette Yes 2 Not Available 4 Left Side Cylinder Head YES 1993 Corvette Yes 2 Not Available 4 Left Side Cylinder Head YES 1994 Corvette Yes 2 Not Available 4 Left Side Cylinder Head YES 1995 Corvette Yes 2 Not Available 4 Left Side Cylinder Head YES 1996 2014 Corvette THIS PRODUCT IS NOT APPLICABLE 1 Controlled by a brass cooling fan switch 2 Controlled by the ECM PCM Computer 3 The JET Fan Switch Harness is only required if main cooling fan control is desired 4 This model is equipped with a secondary cooling fan that is controlled by the ECM PCM 1984 Corvette The main cooling fan is controlled by a brass cooling fan switch identical to the JET 60603 It s located on the passenger side cylinder head between spark plugs six and eight Remove the factory con nector by squeezing and pulling it at the same time Remove the factory switch and replace it with the JET 60603 Switch 1985 Corvette The main cooling fan is controlled by the ECM If euipped with an optional auxiliary cooling fan B4P the fan is controlled by a brass cooling fan switch identical to the JET 60603 It s located on the passenger side cylinder head between spark plugs six and eight The JET 60603 replaces the factory switch 1986 1989 Corvette The main cooling fan is controlled by the ECM If euipped with an optional auxiliary cooling fan B4P the fan is controlled by a brass cooling fan switch iden2. is normally the signal wire on newer oval style relays and terminal B on the older rectangle style relays The connector terminal cavities are identified by letters that are stamped directly on the connector assembly Always refer to a GM Service Manual for proper signal wire connector cavity location and wire color Use a test probe if you are unsure which lead is the signal wire WARNING Never conn he Fan Switch Harn l 12 vol wer rce Dam the harness will occur 6 A Single Fan Operation Attach the T Tap splice connector to the relay signal wire Attach pink connector by crimping it to the red or black wire of the JET Fan Switch Harness Plug the pink blade connector into the T Tap splice connector Single Fan Operation Only Cut the extra lead off or tie it up B Dual Fan Operation Perform step 6A then attach the remaining T Tap splice connector to the secondary fan relay signal wire Attach the pink connector by crimping it to the red or black wire of the Jet Fan Switch Harness Plug the pink blade connector into the T Tap splice connector NOTE The black and red wires are tied together and perform the same function When the engine coolant reaches the turn on point of appoximately 200 degrees F the fan switch will close to ground The ground signal will be sent to the cooling fan relay s The cooling fan s will turn on and remain on until they cool the engine coolant to a turn off point of a
3. JET 60603 Cooling Fan Switch Optional Fan Switch Harness INTRODUCTION The JET part 60603 coolant fan control is a bimetal disc actuated stud mounted SPST single terminal electrical switch The calibrated bimetal disc responds to engine coolant temperature changes to energize an electrically driven coolant fan motor The 1 2 bimetal disc snaps from a concave to a convex shape at a predetermined calibration tem perature This snap action occurs in 1 10 000 of a second with the motion directly transferred to the movable arm for precise snap action cut in and cut out Calibrated bimetal discs are recognized for their inherent reliability and calibra tion stability This part has been specifically designed to control electrically driven coolant fan motors on late model GM automobiles i e Corvette Camaro Firebird and Impala that operate at high ambient tepmeratures The 60603 lowers the coolant temperature thus maximizing engine performance and reducing engine wear INSTALLATION PROCEDURES Electric Cooling Fan Controlled by a Fan Control Switch 1 Drain the cooling system MAKE SURE THE COOLANT IS COOL Disconnect the negative Black battery cable from the battery Locate the factory cooling fan switch The switch is normally located on the cylinder head between spark plugs one and three or six and eight Refer to a General Motors Corvette Ser vice Manual for the switch location Call 1 800 782 4356 or go to www helminc com to o
4. pproximately 185 degrees F The fan switch has apporximatley 15 degree F hystersis with or 5 degrees Note Analog and digital temperature gauges are not completely accurate The turn on and turn off tem perature may vary slightly from what the vehicle gauge reads Furthermore the gauge sensor is located in a different location than the CFS Switch location Coolant temperature may vary at different engine coolant stream locations 7 Reconnect the negative Black battery cable Refill the cooling system to the proper level and check for leaks around the JET 60603 Cooling Fan Sswitch Start the engine and allow the coolant to heat up to operating temperature to insure the fan s operate properly hing n h ling fan www jetchip com 17491 Apex Circle Huntington Beach CA 92647 Tech Line 714 848 5515 Fax 714 847 6290 INSTALLATION CHART Year Model Main Fan Auxiliary Fan Install L ion Optional Harness Req 1984 Corvette Yes 1 Not Available Right Side Cylinder Head NO 1985 Corvette Yes 2 Optional 1 Right Side Cylinder Head YES 3 1986 Corvette Yes 2 Optional 1 Left Side Cylinder Head YES 3 1987 Corvette Yes 2 Optional 1 Left Side Cylinder Head YES 3 1988 Corvette Yes 2 Optional 1 Left Side Cylinder Head YES 3 1989 Corvette Yes 2 Optional 1 Left Side Cylinder Head YES 3 1990 Corvette Yes 2 Optional 1 Left Side Cylinder Head YES 3 1991 Corvette Yes 2 Not Available 4 Left Side Cylinder Head YES
5. rder a GM Corvette Service Manual 2 Unplug the factory cooling fan switch connector Use a 13 16 deep well socket to remove the factory cooling fan switch DO NOT use a spark plug socket If your vehicle is not equppied with a factory switch use a piece of 5 16 square tube to remove the cylinder head water jacket plug USE CAUTION WHEN INSTALLING THE SWITCH INTO THE CYLINDER HEAD CROSS THREADING WILL CAUSE DAMAGE TO THE HEAD AND OR SWITCH 3 Coat the cooling fan switch threads with sealant to prevent leaks Use the same 13 16 deep well sock et to install the switch Plug the factory cooling fan switch connector into the switch 4 Reconnect the negative black battery cable Refill the cooling system to the proper level and check for leaks around the switch Start the engine and allow the coolant to heat to operating temperature to insure the fan s operate properly CAUTION NEVER PLACE HANDS NEAR COOLING FAN S AT ANYTIME SEVERE INJURY MAY OCCUR www jetchip com 17491 Apex Circle Huntington Beach CA 92647 Tech Line 714 848 5515 Fax 714 847 6290 ELECTRI LING FAN NTROLLED BY THE ECM PCM MPUTER Refer to steps 1 3 on page 1 4 On vehicles that are equipped with ECM PCM computer controlled cooling fan s use the JET Fan Switch Harness Locate the electric cooling fan relay s Refer to GM Service Manual for the relay location 5 Locate the fan signal wire coming from the relay connector Terminal F
6. tical to the JET 60603 It s locat ed on the driver side cylinder head between spark plugs one and three The JET 60603 replaces the factory switch 1990 1995 Corvette The primary and secondary cooling fans are controlled by the ECM PCM Computer The JET 60603 is installed in the driver side cylinder head between spark plugs one and three A small 3 8 water jacket plug must be removed with a piece of 5 16 piece of square tube The JET 60603 replaces the plug The JET Fan Switch harness s required www jetchip com 17491 Apex Circle Huntington Beach CA 92647 Tech Line 714 848 5515 Fax 714 847 6290 JET 60603 Cooling Fan Switch JET Cooling Fan Switch Harness Optional Cooling Fan Computer Control Ground _ Ignition Switch JET Harness Signal Wire Tap Connector T COOLING FAN CONTROL Low Temp Fan Switch To Auxiliary Cooling Fan Signal Wire Mechanization Diagram www jetchip com 17491 Apex Circle Huntington Beach CA 92647 Tech Line 714 848 5515 Fax 714 847 6290
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