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My engine temps are getting very high on the factory gauge when towing. Trans temp is in the normal range. Using for scan the ect was-234 after running it it went to 244 with eot at 202. A few minutes later it went to -254. At no time did the fan clutch kick in. After shutting the truck off I could free spin the fan with minimal drag. Does the engine have to be running for the fan to lock up? What about the negative and positive reading?
202 oil isn’t hot at all. 205-215 is normal when towing on flat ground in mostly calm conditions. 10-15 less not towing. I doubt the water temp was that hot because the oil is always at least 5-7 warmer. The fan clutch might be shot by the sounds of it though. What does it feel like when the engine is cold? There should be heavy resistance to the fan blades and it should take awhile to unlock when you cold start the engine and high idle it until it quiets down. You kind of have to be listening for it but it’s easy to hear or not hear once you know what your listening to.
If you're towing and that fan clutch is not kicking in it needs replacement. Especially in the summertime. Deglaze that fan pulley while you are in there.
You don't have a valid ECT reading from the PCM unless you have a manual transmission. You have EOT, however.
I don't think even all manual transmission trucks of this generation have a valid engine coolant temp reading from the PCM. I have an early '99 with a manual and have never gotten anything other than a -255 F value from monitoring any of the PIDs in Forscan that look like they have anything to do with engine coolant temperature. Maybe I am doing it wrong but I think my truck does not have a coolant temp sensor that talks to the PCM. I have the full set of manuals for my truck and the PC/ED does not mention the PCM having any input from the coolant temp sensor and the wiring diagram shows one coolant temp sensor connected to only the instrument panel. As an aside, the PC/ED I have is specifically for 1998 Econoline/early 1999 7.3 and the wiring diagram is just listed as "1999" but given there is no intake air heater in the engine portion it appears to be an early 1999 book.
There is a thread about manual transmission trucks having a second engine coolant temp sensor that talks with the PCM. I have a copy of the 2002 wiring diagrams and part of the PC/ED and the 2002 manual trucks definitely do have provisions for a second engine coolant temperature sensor that talks to the PCM, it's clearly shown in multiple places in the wiring diagram. There are even two DTCs (P0117 and P0118) that are for low and high input on the PCM circuit monitoring the second ECT. All of that is lacking from my early 1999 books, so maybe sometime between late 1999 and 2002 the manual trucks gained the second engine coolant temp sensor that talks to the PCM?
ECT should be in the rough ballpark of the EOT. My truck will be within a few degrees of each other until a certain point, then my EOT can get to a 10+ deg difference.
I wasn't hearing my clutch fan working for a long while, so I recently replaced it with an OEM unit. Now I hear it all the time BUT I haven't really noticed any difference in ECT or EOT. So I wouldn't expect to see any gains IMO...maybe your situation is different than mine. My original clutch fan seemed okay spinning it by hand but could never hear it anymore.
I replaced the Dan clutch today. I do notice a difference. I can hear the rush of air when it engages. It wasn’t doing that before. The new and old fan clutch each seemed to have same resistance when turning by hand. I was skeptical the new one was going to make a difference but it did. 205 dollars well spent in my opinion. I’ll be towing my travel trailer this week so that will be the final test. Thanks!
I replaced the Dan clutch today. I do notice a difference. I can hear the rush of air when it engages. It wasn’t doing that before. The new and old fan clutch each seemed to have same resistance when turning by hand. I was skeptical the new one was going to make a difference but it did. 205 dollars well spent in my opinion. I’ll be towing my travel trailer this week so that will be the final test. Thanks!
Very important. Did you deglaze the water pump pulley while you were in there? That added load will make the belt slip right when you need it the most, pulling that heavy load up a mountain pass and the fan clutch fully engages. I've lost count how many times I had to back way out of the throttle and drop two gears just to control engine temperature before I did that one simple little mod to the pulley.
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