engine overheated!! no cooling fan April 15, 2012, 09:50:50 PM well put some miles on the TC yesterday, found out the hard way the cooling fans arent working. the overflow tank puked over like a teenager after a whole bottle of Jack. no cooling fans when the gauge is pegged on high. today i redid the fan connectors, and tested the fans with 12v. they are fine. so i see the cooling fan relay next to the VAM, do these go bad often? is there a cooling fan switch along with the ECT? or does it all run from the ect on this? Quote Selected
engine overheated!! no cooling fan Reply #1 – April 16, 2012, 12:23:02 AM I believe the TC's have CCRM's and they are known to fail eventually. That is my best guess to what's wrong. Quote Selected
engine overheated!! no cooling fan Reply #2 – April 16, 2012, 04:00:23 AM If you check for codes, the eec will also test for fam operationMy bet would be IRCM I drilled out the rivets, and replaced the relays with externals. Quote Selected
engine overheated!! no cooling fan Reply #3 – April 16, 2012, 06:24:29 AM Ircm or the CTS. Throw on the AC and see if the secondary fan runs. (AC SYSTEM MUST BE WORKING FOR IT TO RUN) Or just bridge the high pressure AC switch on the High side AC line. That will run the AUX fan. The primary fan is controlled by the CTS. Pull the connector and see if the primary fan runs. That will FAST test the IRCM. But you need to build a stand alone fan module to correct the issue permanently. ThanksNote you can also install a temp sender to run either fan by installing one in the heater hose as a fast fix.Note if you have a scan tool you can force run the fans. When you do a KOEO phase it runs the fans also.Note i think if memory serves me the IRCM is obsolete on that car. But i have a half dozen of them!!Above is a fast way to install an AUX TEMP SENDER TO RUN THE FANS. Install this fitting in either heater hose and a sensor in the extra tapped hole. I normally drill and tap the upper and install it their. Quote Selected
engine overheated!! no cooling fan Reply #4 – April 16, 2012, 09:21:25 AM Also check for loose/failed connections at the fans. I had that problem once.EDIT: DOH I see you checked that. Quote Selected
engine overheated!! no cooling fan Reply #5 – April 16, 2012, 09:40:30 AM So, it's also usually good to specify the year of TC, since they're not the same over the years... Quote Selected
engine overheated!! no cooling fan Reply #6 – April 16, 2012, 04:23:44 PM Type of vehicle you own 1988 turbo coupe His profile says it is an 88. I checked it before posting Quote Selected
engine overheated!! no cooling fan Reply #7 – April 16, 2012, 05:11:29 PM ok to the poster with the external Relays that is genius. Quote Selected
engine overheated!! no cooling fan Reply #8 – April 17, 2012, 09:34:49 AM Quote from: TOM Renzo;386970Type of vehicle you own 1988 turbo coupe His profile says it is an 88. I checked it before postingInfo should be posted in the thread. Kind of common sense. If you're asking for advice, we shouldn't also have to go figure out what kind of car you own, or are working on. Make it easier for those trying to help you. Quote Selected
engine overheated!! no cooling fan Reply #9 – April 17, 2012, 09:55:23 PM Quote from: Chuck W;387023Info should be posted in the thread. Kind of common sense. If you're asking for advice, we shouldn't also have to go figure out what kind of car you own, or are working on. Make it easier for those trying to help you.sorry, i thought my car showed up in a signature. hey i'm still new here Quote Selected
engine overheated!! no cooling fan Reply #10 – April 17, 2012, 09:57:21 PM Quote from: TOM Renzo;386945Ircm or the CTS. Throw on the AC and see if the secondary fan runs. (AC SYSTEM MUST BE WORKING FOR IT TO RUN) Or just bridge the high pressure AC switch on the High side AC line. That will run the AUX fan. The primary fan is controlled by the CTS. Pull the connector and see if the primary fan runs. That will FAST test the IRCM. But you need to build a stand alone fan module to correct the issue permanently. ThanksNote you can also install a temp sender to run either fan by installing one in the heater hose as a fast fix.Note if you have a scan tool you can force run the fans. When you do a KOEO phase it runs the fans also.Note i think if memory serves me the IRCM is obsolete on that car. But i have a half dozen of them!! Above is a fast way to install an AUX TEMP SENDER TO RUN THE FANS. Install this fitting in either heater hose and a sensor in the extra tapped hole. I normally drill and tap the upper and install it their. wow lots of good tips! i found the ECT and found a measurement to test it by, if thats good i may try to do the external relay thing. Quote Selected
engine overheated!! no cooling fan Reply #11 – April 20, 2012, 07:39:39 AM well, ect checks out good. we took the CRM relay apart, and it looks terrible in there. we actually figured out the relay was good but the board is in really bad shape. I am really looking for another unit now. Quote Selected
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