MJ.rusty Posted September 29, 2009 Share Posted September 29, 2009 Does anyone know what colors the wires are foe the cool ant temp sensor for a 90 4•0l? And where is the cool ant temp sensor located on an HO motor? Link to comment Share on other sites More sharing options...
Eagle Posted September 29, 2009 Share Posted September 29, 2009 The Renix (1990 and older) engines have two coolant temperature sensors. The one in the head is for the temp gauge on the dashboard, the one on the side of the block is for the ECU. Which one are you asking about? On the HO engines, the temp sender is in the thermostat housing. Link to comment Share on other sites More sharing options...
Geonovast Posted September 29, 2009 Share Posted September 29, 2009 But the HO ones still have two senders. Gauge one is in the same spot at the Renix, back of the head, and the ECU one is in the thermostat housing. The one for the gauge only has one wire, and IIRC on my 88 it's pinkish. Link to comment Share on other sites More sharing options...
mvusse Posted September 29, 2009 Share Posted September 29, 2009 Don't have Renix engines with an auxiliary fan have a third one in the radiator? I believe the aux fan on the HO engines is controlled by the ECU based on the thermostat housing sensor's reading. Link to comment Share on other sites More sharing options...
Geonovast Posted September 29, 2009 Share Posted September 29, 2009 Don't have Renix engines with an auxiliary fan have a third one in the radiator? I believe the aux fan on the HO engines is controlled by the ECU based on the thermostat housing sensor's reading. I believe so. I seem to remember there being a sensor in the rad when I just had the motor out of the XJ. Link to comment Share on other sites More sharing options...
HOrnbrod Posted September 29, 2009 Share Posted September 29, 2009 I believe the aux fan on the HO engines is controlled by the ECU based on the thermostat housing sensor's reading. Correct. :cheers: Link to comment Share on other sites More sharing options...
dasbulliwagen Posted September 29, 2009 Share Posted September 29, 2009 cool ant temp sensor :rotf: Link to comment Share on other sites More sharing options...
MJ.rusty Posted September 30, 2009 Author Share Posted September 30, 2009 Sorry. I was asking about the sensor in the side of the block. The PO cut the wires and. Plugged the whole. I'm thinking it might b a HO motor cause of small things such as the old coil that's mounted on the side of the block. Any definitive. Way to tell if its HO ? Link to comment Share on other sites More sharing options...
Eagle Posted September 30, 2009 Share Posted September 30, 2009 Sorry. I was asking about the sensor in the side of the block. The PO cut the wires and. Plugged the whole. I'm thinking it might b a HO motor cause of small things such as the old coil that's mounted on the side of the block. Any definitive. Way to tell if its HO ? Coil on the side of the block? That sounds to me like an old AMC 258 c.i.d. engine. The Renix coil/ignition module is on the inner fender, and I thought the HO mounted it in the same place. Link to comment Share on other sites More sharing options...
fiatslug87 Posted September 30, 2009 Share Posted September 30, 2009 I'm thinking it might b a HO motor cause of small things such as the old coil that's mounted on the side of the block. Any definitive. Way to tell if its HO ? Some differences are: RENIX has an EGR valve, HO does not RENIX air intake bolts to throttle body with 3 screws, HO is different RENIX valve cover: HO valve cover: I'm sure there are others along with what was mentioned above, I thought there was a post with differences a while ago. Link to comment Share on other sites More sharing options...
Geonovast Posted September 30, 2009 Share Posted September 30, 2009 The Renix coil/ignition module is on the inner fender, and I thought the HO mounted it in the same place. Nope, it's on the block. For the 2.5 and 4.0. IIRC 4.0 mounts in front of the dist, 2.5 mounts behind. I can get pics of each when I get home. Link to comment Share on other sites More sharing options...
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