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1st thing to try is does the fan work when you give it 12V?
as they can seize up or fail internally
you've done a lot of the normal background tests I'd reccommend
so I'm to open this back up to other experts one of whom hopefully has seen this before
and don't reply to me, please wait for the next expert to pitch in
Hi,this sounds like a interesting problem.From your notes(which are very detailed) you've done quite a bit.Let me ask if I may if the cooling fans come on with when a/c or defrost is selected unless I over looked it I did not see this in your notes.How are you monitoring engine temperature?scanner?What temperature thermostat is installed,thanks for your time,I'll do my best to help you out here.
So,the car doesn't overheat now, right?My question is when do you think fans should be coming on,they should come on about 204-209,has the engine temp ever reached beyond this?What does the gauge show ?Sorry about all the questions but the more info I have the easier it is to wrap my head around it,thanks
Yep ,temps are at the range that fans should begin working,for giggles did you think about replacing coolant temp sensor to be honest although the values are matching up what else would command the fans to come on, plus having overheating could have damaged it also.
Hi again,the coolant temp sensor must be delevering the engine temp since your reading it through your scanner, sorry I hate parts changing anyways.I'd like for you to do me a favor and put the electrical system into diagnostic mode ,this will run all solenoids relays fuel pump and cooling fans on high and low speeds ,to place in this mode there are a set of green connectors under the dash that need to be plugged together to place in this mode.The connectors reside on the drivers side above the foot well depending on the build date these connectors are either to the left or right of the steering column.When you find them connect them and turn key to on allI mentioned should run on/off continuously until key is turned off,let me know if fans are operating,thanks
Hi,this is boggling.I'll take a bite out of that bullet too ,try the temp sensor. I did a little research on the ECM logic and could not find anything about the logic concerning the speed signal but I was thinking about the seat belt warning light. Are you aware if your belt isn't buckled if the warning light flashes and audible tone sounds after moving more than 6mph? Not sure if this isn't working if it would cause fans not to operate... just a thought,I will talk to you tomorrow, thanks.
Hi,if you can forward the chart to me I'd be interested to see it.Have you changed out coolant temp sensor yet?I'm curious,thanks