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My L98 standard coolant fan (not the auxiliary fan) doesn't come on. If I ground the relay it comes on telling me that the problem lies between the relay and pin C1 of the ECM. The manual doesn't seem to tell me when the ECM puts C1 to ground. I have not checked continuity from the relay to the ECM yet but do want to know when C1 is supposed to switch.
I'll check to see what temp I'm getting to. I was under the impression that it was supposed to kick on at a lower temp than that. This engine is installed in a 58 vette so there is custom wiring involved. I do know that I hadn't driven the car for some time and left it at a high idle and when I came back after about 10 minutes the radiator was puking with steam everywhere but I only lost about a quart of coolant. I was in such a rush to get the engine shut off I didn't notice if the fan was running at that time. I'll repeat and keep an eye on it. I have a 180° thermostate installed so I'll hopefully never get to those kind of temperatures but I do know the small primary fan used to run during normal operation.
Just having a 180 thermostat really does nothing. You must also have something that turns the fans on earlier than factory for it to be of any use at lower speeds and idling.
Personally I hate electronic cooling fan controls. I bypassed mine and use the mechanical switch to run both fans at once.
I'll check to see what temp I'm getting to. I was under the impression that it was supposed to kick on at a lower temp than that. This engine is installed in a 58 vette so there is custom wiring involved. I do know that I hadn't driven the car for some time and left it at a high idle and when I came back after about 10 minutes the radiator was puking with steam everywhere but I only lost about a quart of coolant. I was in such a rush to get the engine shut off I didn't notice if the fan was running at that time. I'll repeat and keep an eye on it. I have a 180° thermostate installed so I'll hopefully never get to those kind of temperatures but I do know the small primary fan used to run during normal operation.
You mentioned cooling issues and all of this in March '18 and I would have thought you had it pretty much sorted by now. You're the only one that can actually determine where you're at now. There ain't no 'magic' in this thread!
Just having a 180 thermostat really does nothing. You must also have something that turns the fans on earlier than factory for it to be of any use at lower speeds and idling.
Personally I hate electronic cooling fan controls. I bypassed mine and use the mechanical switch to run both fans at once.
Benny 42, that's what I do with my HD fan but I know the standard fan used to come on with C1 going to ground long before 220°. I never let it get that hot..
Benny 42, that's what I do with my HD fan but I know the standard fan used to come on with C1 going to ground long before 220°. I never let it get that hot..
I run mine on the aux fan switch in the driver side head too. I didn't know it was a custom setup.The stock sequence is to start the fan about 235* and i don't like to run mine that warm either.The ECM runs the (main) fan based on the coolant temp sensor in the front of the intake manifold.(not the switch) , is yours reading a really low operating temp? That will delay the main fan or keep it off altogether.
On my 85 ( engine is worked) I cut the top hose, put a spacer / splicer in from Speed Way with a thermo switch tap, Run a 185 switch and relay. The car runs 180 - 190 on the highway and 195 -200 in traffic with the A/C on. I'm putting another switch and relay in for the aux fan , a 195. I will use a water neck with the necessary port for the switch.
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Coolant fan doesn't come on
