Heres the details: C6 20K miles on odo & its an automatic.
Reason:Brought vehicle in for rough delayed clunky shifting, slight lag,to Chevy dealer with good service reputation. Had motor oil changed and They said they would reset computer and would due a 100% tranny fluid and filter exchange wich sounded good to me. BUT when I got work order it said tranny Flush . Those two procedures I thought were differant ? Result: noticeably smoother,less delayed faster shifts,less clunky even feels a bit quicker. The bad: noticeably more of a rough shaky idle, not extreme but annoying. Also on highway: all temps and guages appear to be normal. Heres the other issue, I noticed , now at idle or sitting at a light for instance engine temp will go up rather quickly to the 220 mid way mark or slightly above, as tranny temp will go from its normal 160-180 and steadily climb to over two hundred while car is just sitting there.Oil temp was 217-225 forgot what coolant temp was, what shoulD it be ? I had exaust fuse pulled when work was performed ( you know to keep all exaust ports open) Im obviously bringing it back but would like any ideas or thoughts please.P.S. no point in debating tranny fluid changing procedures, ive already seen all of the" you should and should not flush tranny arguments. " Its irrelevant because whats done is done . Just want to know if theres a possible problem. Thanxxx

 

While in Bowling Green recently the ambient temp was 90 + with high humidity it did affect temperatures, Coolant did not go north of 205, I wasn't to concerned although I did watch gauges closer. While at speed If I was at 80 or 90 oil temp. would go to 232 coolant would go to 198. If I lived in the south I would probably look for additional cooling capacity, bigger radiator, bigger oil cooler, 180 t-stat.

 

Maybe a stupid inquiry, automatics have transmission temp sensors?

If so what year did this start for the C6.

My 08 MN6 doesn't have this....hope this is correct or my foot is in my mouth again...

 

Does your engine temp guage ever move ? Ive watched countless videos of interior view c6 acceleration videos and never seen any of them go past 220 mark on engine temp (the guage on left side of instrument cluster . O was under the impression that guage should never move , right or wrong

 

my 07 A6 shows the transmission temp

 

Sitting in traffic yes went to 205 while running at speed 198 was the highest, that was with a 90 deg. ambient temp. Mine is an a6 z51 optioned car. At 220 I would have thought about turning the heater on and trying to dump some heat.
Bill

 

My 05 A4 has the transmission temp, I just installed a transmission cooler with fan installed and still am getting temps around 210 at times on my transmission. I will say that since I have the transmission cooler in series after it goes through the radiator, it has kept my oil, coolant and transmission all three a little cooler than without it.

I had my 2005 A4 flushed and have not got it fixed yet and it has been over a year. I am battling a P0700A code that did not exist before I had it flushed. I do hope to solve this in the next 6 weeks.

 

Oh My #1 concern is is it normal for the temp guauge on the left side of instrument cluster to go to 220 and a little above very quickly while your just sitting ther idle or is it indicating motor is hotter than normal .again this started happening after the flush But yet its shifting awesome and it feels lke a new tranny was put in it. Almost like it improved one thing interfered with another Excuse my ignorance this is my first vette and ive only owned one for three months i dont know squat about them thats why im here..

 

220 is pretty high but as long as it comes down when car starts moving its not out of spec but I would be concerned if car stayed at 220. If outside temp is around 100 my car will reach 215 at stop light, but if outside temp is in 80s then eng temp does not go much above 205.

 

Engine temp at 220 at stop light, turn the radio off, leave AC on with the fan on low, roll the window down, and make sure that the rauditor fan is running at close to full blast. Next, get under the front of the car with the front end lifted up, and make sure that their is no debris in front of the AC coil, or wedged between the AC coil and the front of the radiator.





As for engine shaking at idle, either bad motor mount, or its time to pull the spark plugs, and plug wires to make sure that the plugs are clean/correctly gap'd @.040", and the wires boots have been dielectric greased and seated correctly on both the spark plugs and the coils above.
Note, the factory plugs are good for 100K, but depending on the fuel additives used, the additives can be burnt into the plugs connectors, and what you are really cleaning off instead before the 100K mark.

Liquid filled motor mount that has cracked, and the fluid now leaking out.

 

Meaning when your looking at the guage on the instrument cluster or the digital oil temp on info center. Hats of to gm for allowing driver to check system thorough info center my Infiniti never had that but my G37 temp guage never moved a cat hair ever even in north carolina heat

 

Guys reread my post , these fluctuating temps like this only started doing this after tranny service , the instrument cluster engine temp guage would never move, and the tranny temp would never go above 180swondering if an improper tranny flush would be causing a rise in engine/tranny temp as well as rough idle at stop due to disloged varnish/gunk loosened up and entering tight areas. And what are the average temps for my fellow vette drivers if they noticed. Does anyones interior instrument engine temp guage ever fluctuate ? Is it normal. Im trying to determine if service dept effed up my tranny/motor the weird thing is that its running good aside from rough idle and hot temp issues,its fast as hell again ('_')

 

I would vote that the trans flush had nothing to do with what you are experiencing now.

I would tell you to check the front of the radiator to see if you picked up dirt etc that could be blocking it. This has happened to me

Dave

 

What about trans temp jumping up 25 points while stoped for 10 mins is it normal for tranny temp to go from 175 to 200 + while being parked stoped ( car running) why would temp rise so hot and so fast if your not even moving is this normal ?

 

If the radiator is blocked the trans cooler is also not going to get proper air flow either . It's an easy check, just look up under the front of the car behind the bumper

I have only 50,000 on my 11 and I found a lot of junk had been sucked up there . I just gently brushed it all out .

My second place I would look as was already posted is to see if my fans were working .

My car never goes above 198-205 and I live in Georgia

... but I can hear my fans running when it's real hot especially when I pull it into the garage .

Check your fans and make sure they are running on high when it's hot. You will hear them I assure u

Dave

 

The transmission, isn't related to the rough idle. I agree with Dano. As for the transmission temp. have dealer recheck level (because there is no dipstick )

 

It is normal for temps to rise while at idle. Yesterday while stuck in stop and go traffic in 101 degree heat my water temp would climb up to 218 to 220, then drop to 195 once I was back to hwy speeds.

Like others have said, check for debris on ac condenser and between condenser and radiator. Pull air filter and radiator cover to acess.

I have found leaves, plastic bags and lots of crud in between them. I do a yearly flush and clean it 2 to 3 times during summer.

 

I just wanted to mention this because others have mentioned it. If you go to Walmart, in the section with fans and heating and cooling stuff, they have a can of stuff that you spray on to the coils of air conditioners and radiators to clean the fins and stuff, it can help dissolve some of the stuff in there like bugs that reduce the cooling. It is not very expensive, I spray mine about twice a year just to help keep it clean and get all the dead crunchy things out of it. I have not seen it harm or damage anything around it either so it seems safe.

I wish I could find the acid that commercial AC pros use to spray it on there, that would really shine and clean it out but I am afraid of what it would do the the other parts.

 

Even with a remote trans cooler, doesn't the transmission fluid go through the cooler in the radiator tank as well?

If that's the case, then the trans fluid would warm up with the engine warming. I would be checking to be sure your fan connector hasn't fried. Turn on the AC and make sure the fans are running when stopped.

 

It depends on how they did the cooler, you can either run them in series which is through the radiator first and then the cooler to the transmission where the temp sensor in the transmission records the correct trans fluid temp.

Or it can be run by bypassing the radiator and just using the cooler, in this case the engine oil temp, trans fluid temp and coolant temp all warm and cool each other to a point, most do not do this if they live where it gets cold because the in series method allows the oil and coolant in the radiator warms up the transmission fluid in cold weather.

Plus when you run them in series, it provides redundancy in case one of them fails or fails to cool as it should.

So it depends on how the cooler is run, mine is in series, transmission to the radiator, radiator to the cooler, cooler to the transmission.