Dedicated LVC Member
- Jul 9, 2017
- Reaction score
Reading this thread makes me wish I never would've sold my V8 LS the transmission had the dreaded P0741 code but it hadn't effected the drivability in the least ...even the mpg was back to 24 on Highway ...really kicking myself in the ass now ...what kind of radiator do you have on this V6?OK took for another test today. Now I think I have two problems.
Put new degas cap on (from other LS been running great.) Not Fomoco.
Started at 90 degrees C ECT. Got to same spot as yesterday where boiling had begun and all was fine. Temp about 103C. Fan at 10% or so.
Drove hard mostly uphill to store about 7 miles. All good all the way until stopped. Temp went up to 116C (241F). Temp gauge crept up above 1/2 to nearly 5/8. Fan said it was at 100%. Coolant did not boil or leak out but did expand. Came out of store. All same. Started and fan went straight to 100% and temp began to drop. Drove home and gauge was just a hair above 1/2 most of the way. Got home and all was well with ECT=103 and no boiling. Did not expand.
So obviously I got a bad degas cap from Ford. This one in there now prevented boiling up to 116 where the other boiled at 111. I noticed that bad cap went on very easily and just merrily went click click click when tightening. This better one is harder to put on and tough to tighten to get a few clicks.
Then there is another problem which causes the ECT to climb to 116. I was thinking thermostat? But when I checked forscan at home I found the FANVAR parameter said failed. Hmmm. I did not notice this on the drive. Not sure when it failed and under what circumstance unfortunately. Fan seemed to work but something thinks it isn't working properly. Variable says "Cooling fan driver fault." So gotta attack that. Not sure how to get more info on it.