Wdavis Posted August 17, 2023 Share Posted August 17, 2023 2006 granite, engine fan works with a/c and stays engaged when air pressure is low but won't turn on with high engine temp. What is going on? Quote Link to comment Share on other sites More sharing options...
0 Joey Mack Posted August 17, 2023 Share Posted August 17, 2023 are the 2 temp sensors on the rear water manifold plugged in? Quote Link to comment Share on other sites More sharing options...
0 Mackpro Posted August 18, 2023 Share Posted August 18, 2023 If it’s a Horton air fan then the engagement and dis-engagement temps are programmable. Usually set to engage at 205 and shutoff when coolant gets down to 195. Any changes to the engine ECM? 1 Quote Link to comment Share on other sites More sharing options...
0 Wdavis Posted August 18, 2023 Author Share Posted August 18, 2023 There is only one temp sensor I see in the water manifold and it points straight to the rear and the wiring looks good No recent changes to the ecm that I'm aware of Bruckners said there was behind the oil filters but there isn't Quote Link to comment Share on other sites More sharing options...
0 Wdavis Posted August 18, 2023 Author Share Posted August 18, 2023 I apologize for my typing skills. Bruckners said there was a coolant temp sensor by the oil filters but there isn't one that I could see Quote Link to comment Share on other sites More sharing options...
0 Joey Mack Posted August 18, 2023 Share Posted August 18, 2023 oil temp and pressure is what its ported for at the oil filters 1 Quote Link to comment Share on other sites More sharing options...
0 Mackpro Posted August 18, 2023 Share Posted August 18, 2023 If your coolant temp gauge is working then the sensor is good. With you Horton air, it take air to dis-engage the fan clutch so when the air pressure is low if will remain engaged till the air pressure get to 80-90 psi. To double check. With the air pressure built up and truck running, unplug the green AC high pressure switch near the AC drier and make sure the fan kicks in . Then plug it back up and the fan should dis-engage in 30-60 seconds ( depending on parameters settings) 1 Quote Link to comment Share on other sites More sharing options...
0 Wdavis Posted August 18, 2023 Author Share Posted August 18, 2023 The fan cycles with the a/c on Quote Link to comment Share on other sites More sharing options...
0 Wdavis Posted August 18, 2023 Author Share Posted August 18, 2023 And the temp Guage appears to be operating as it should Quote Link to comment Share on other sites More sharing options...
0 Mackpro Posted August 18, 2023 Share Posted August 18, 2023 12 volts comes of of the fuse box on the firewall under the cab and goes to the fan clutch solinoid that also bolted to the firewall. The ground wire from the fan clutch solinoid goes back to the engine ECM. It makes or breaks the ground to turn on or off the solinoid/fan. The engine ecm looks at coolant temp. AC high pressure and intake temperature to turn the fan on . Quote Link to comment Share on other sites More sharing options...
0 Mackpro Posted August 18, 2023 Share Posted August 18, 2023 This is a CV713 correct? Quote Link to comment Share on other sites More sharing options...
0 Wdavis Posted August 18, 2023 Author Share Posted August 18, 2023 Cv713 Quote Link to comment Share on other sites More sharing options...
0 Mackpro Posted August 18, 2023 Share Posted August 18, 2023 In theory if the AC high pressure switch will turn the fan clutch on and the coolant temp sensor works ( gauge works) then it should work correctly. In the engine parameters there a setting for electric viscous , on-off( Horton air fan) and regular old style viscous fan. If the setting was not correct then possibly there could be a issue. What the last 6 of Vin 1 Quote Link to comment Share on other sites More sharing options...
0 Wdavis Posted August 18, 2023 Author Share Posted August 18, 2023 I'm at home for the day so I can't get the fan but I know the fan parameter is set to on/off. I have a diesel laptop and that's the only fan parameter I have 1 Quote Link to comment Share on other sites More sharing options...
0 Joey Mack Posted August 18, 2023 Share Posted August 18, 2023 im curious??? do you have the brass air celenoid on the left side of the radiator, that sends air to the fan hub via: 1/4'' air line? Quote Link to comment Share on other sites More sharing options...
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Wdavis
2006 granite, engine fan works with a/c and stays engaged when air pressure is low but won't turn on with high engine temp. What is going on?
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