Does the 700R4 Transmission Temperature = Engine Temperature?
Thread Starter
Intermediate
Joined: Dec 2015
Posts: 32
Likes: 1
Does the 700R4 Transmission Temperature = Engine Temperature?
Is the 700R4 Automatic ATF temperature equal that of the Engine/Radiator water temperature? That's what I've seen in my 88 Vert. I installed a transmission temperature gauge because the cabin was very warm in the summer.
In as much as the Automatic oil cooler is part of the Radiator, I think that the water temperature in the Radiator heats up the Automatic ATF oil. Am I right?
That being the case then the 700R4 will always be overheating.
That's because an Automatic Transmission should be running between 175 to 180degrees. Anything beyond that will shorten the Automatic's life.
Yet the normal Engine Temperature could easily be 225 to 235 degrees.
I try not to drive my 88Vert in the Las Vegas summer heat of 110F.
That's because the Engine runs at about 235F and the transmission runs the same 235F.
Do you guys see the same temperature for the engine and the 700R4 transmission if you are running a transmission temperature gauge as I do?
I don't know if I should get a deep sump or an external oil cooler.
Any ideas would be much appreciated.
Thanks in advance.
In as much as the Automatic oil cooler is part of the Radiator, I think that the water temperature in the Radiator heats up the Automatic ATF oil. Am I right?
That being the case then the 700R4 will always be overheating.
That's because an Automatic Transmission should be running between 175 to 180degrees. Anything beyond that will shorten the Automatic's life.
Yet the normal Engine Temperature could easily be 225 to 235 degrees.
I try not to drive my 88Vert in the Las Vegas summer heat of 110F.
That's because the Engine runs at about 235F and the transmission runs the same 235F.
Do you guys see the same temperature for the engine and the 700R4 transmission if you are running a transmission temperature gauge as I do?
I don't know if I should get a deep sump or an external oil cooler.
Any ideas would be much appreciated.
Thanks in advance.
Safety Car
Joined: Aug 2006
Posts: 4,147
Likes: 452
From: Port St. Lucie West Florida
I live in Florida and my water temps run from 96-203 dg in the summer with the a/c on normal driving no traffic. I do have a 95 Vette which has a different engine( LT1) I also have a Dewitt's radiator and a B&M trans cooler (stacked plate type) . I think your water temps are too hot. Others with your year will add their comments on this. Make sure there is no debris blocking the radiator. These cars are notorious for sucking in all dirt. That may help. Make sure you have the correct thermostat. You don't mention if the temps are when driving highway or in traffic. If you use the a/c that will automatically turn your cooling fans on so it should run cooler. Check your antifreeze to make sure it's clean. You should replace the antifreeze if it wasn't recently done. 175 dg for the trans is good. 235dg is not. You should be using your digital gauge for the water temps as its more accurate than the analog.
I also would consider a trans cooler
Good luck
I also would consider a trans cooler
Good luck
Last edited by enventr; Jan 30, 2016 at 12:32 PM.
Race Director
Joined: Oct 2008
Posts: 17,982
Likes: 1,072
From: Lansing MI
Sounds like your car is running too hot. 235 is too hot.
Yes the engine coolant will keep the transmission fluid at close to the same temp. This is the way it's supposed to be, so unless your car is modified then don't worry about it. Just figure out why the engine is running so hot.
Yes the engine coolant will keep the transmission fluid at close to the same temp. This is the way it's supposed to be, so unless your car is modified then don't worry about it. Just figure out why the engine is running so hot.
Race Director
Joined: Oct 2008
Posts: 17,982
Likes: 1,072
From: Lansing MI
Thread Starter
Intermediate
Joined: Dec 2015
Posts: 32
Likes: 1
How do I check and clean the garbage between the radiator & airconditioner condenser
Is there a youtube video or explanation on how to get between
the radiator & the airconditioner condenser so I can check for
debris and clean it in my 88 C4?
Thanks.
the radiator & the airconditioner condenser so I can check for
debris and clean it in my 88 C4?
Thanks.
Team Owner
Joined: Sep 2001
Posts: 62,119
Likes: 1,725
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
Remove the air box and MAF, then you'll start removing the screws holding the plastic housing over the radiator, should be 4-6 of them going from memory, and then the fan relays, once that is off you'll see everything. You'll see the debris. Very straightforward.
Melting Slicks
Joined: May 2013
Posts: 2,692
Likes: 349
From: Sacramento California
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Thread Starter
Intermediate
Joined: Dec 2015
Posts: 32
Likes: 1
It's 78f now and my engine temp on the freeway was 175f (180f thermostat)
but my trans temp (700R4 L98) was already 190f.
Why is my trans temp higher than my engine temp? Any ideas?
I guess I'll be overheating once the Las Vegas arrives with 115f weather.
Thanks.
but my trans temp (700R4 L98) was already 190f.
Why is my trans temp higher than my engine temp? Any ideas?
I guess I'll be overheating once the Las Vegas arrives with 115f weather.
Thanks.
Safety Car
Joined: Aug 2006
Posts: 4,147
Likes: 452
From: Port St. Lucie West Florida
I do not know where your trans gauge is hooked up to. Is it before the cooler or after the cooler? I would consider a B&M tranny cooler especially where you live. I hope you checked for debris in front of the radiator. With the a/c on you should get cooler temps if your system is clean and running properly. I would even change the stat just in case it does not fully open
Good luck and let us know your results
Good luck and let us know your results
Le Mans Master
Joined: Sep 2013
Posts: 6,192
Likes: 750
From: near the thumb in the mitten
If trans doesn't go into lock up the slippage in torque converter will heat up fluid. Just as it does in stop and go traffic. Because of the local climate I would add additional cooler...110+ is too hot for me
Instructor
Joined: Aug 2014
Posts: 144
Likes: 2
From: Ca
Never cared for Or trusted the coolers in the radiator for the Tranny! Tranniez get miles small mater clutch debry can restrict or plug tranny cooler causing heat of tranz and of engine With the possibility of leaking contaminating oil with coolent I alway put a external cooler and bypassed factory cooler on my cars but Ive always lived in Cali never have a problem with cold weather! Sitting at a long signal after freeway driving my 88 will creep up to 234 fans kick on 230 cools down 219 once driving drops to 195-200 with a 195 thermostat! Thermostat controls the low end of temp not top end!
Safety Car
Joined: Aug 2006
Posts: 4,147
Likes: 452
From: Port St. Lucie West Florida
Never cared for Or trusted the coolers in the radiator for the Tranny! Tranniez get miles small mater clutch debry can restrict or plug tranny cooler causing heat of tranz and of engine With the possibility of leaking contaminating oil with coolent I alway put a external cooler and bypassed factory cooler on my cars but Ive always lived in Cali never have a problem with cold weather! Sitting at a long signal after freeway driving my 88 will creep up to 234 fans kick on 230 cools down 219 once driving drops to 195-200 with a 195 thermostat! Thermostat controls the low end of temp not top end!
Last edited by enventr; Feb 19, 2016 at 12:17 PM.
Thread Starter
Intermediate
Joined: Dec 2015
Posts: 32
Likes: 1
Auto Trans Temp got higher than Engine Temp.
Hi guys,
Well summer is starting.
There's no debris in front of my radiator.
Both front and rear radiator fans are on constantly.
Thermostat is 180f.
A few days ago it was 95.
I was running errands for maybe 45 minutes. No freeway.
Engine got up to 206 which is OK I guess.
But 700R4 Auto Trans got up to 220f before I stopped.
I'm in Vegas so summer is 110f-125f during the day.
I don't have a Trans Cooler yet.
I bought one on ebay with a fan and my mechanic and I
couldn't figure out where to put it.
I bought a B&M stacked trans oil cooler which is smaller and
I'm still trying to figure out where to put it.
Someone suggested to put it somewhere near the radiator
water bottle but I can't figure out where to hang it in there.
Thanks for all the help in advance.
Jay.
Well summer is starting.
There's no debris in front of my radiator.
Both front and rear radiator fans are on constantly.
Thermostat is 180f.
A few days ago it was 95.
I was running errands for maybe 45 minutes. No freeway.
Engine got up to 206 which is OK I guess.
But 700R4 Auto Trans got up to 220f before I stopped.
I'm in Vegas so summer is 110f-125f during the day.
I don't have a Trans Cooler yet.
I bought one on ebay with a fan and my mechanic and I
couldn't figure out where to put it.
I bought a B&M stacked trans oil cooler which is smaller and
I'm still trying to figure out where to put it.
Someone suggested to put it somewhere near the radiator
water bottle but I can't figure out where to hang it in there.
Thanks for all the help in advance.
Jay.
Safety Car
Joined: Aug 2006
Posts: 4,147
Likes: 452
From: Port St. Lucie West Florida
Hi guys,
Well summer is starting.
There's no debris in front of my radiator.
Both front and rear radiator fans are on constantly.
Thermostat is 180f.
A few days ago it was 95.
I was running errands for maybe 45 minutes. No freeway.
Engine got up to 206 which is OK I guess.
But 700R4 Auto Trans got up to 220f before I stopped.
I'm in Vegas so summer is 110f-125f during the day.
I don't have a Trans Cooler yet.
I bought one on ebay with a fan and my mechanic and I
couldn't figure out where to put it.
I bought a B&M stacked trans oil cooler which is smaller and
I'm still trying to figure out where to put it.
Someone suggested to put it somewhere near the radiator
water bottle but I can't figure out where to hang it in there.
Thanks for all the help in advance.
Jay.
Well summer is starting.
There's no debris in front of my radiator.
Both front and rear radiator fans are on constantly.
Thermostat is 180f.
A few days ago it was 95.
I was running errands for maybe 45 minutes. No freeway.
Engine got up to 206 which is OK I guess.
But 700R4 Auto Trans got up to 220f before I stopped.
I'm in Vegas so summer is 110f-125f during the day.
I don't have a Trans Cooler yet.
I bought one on ebay with a fan and my mechanic and I
couldn't figure out where to put it.
I bought a B&M stacked trans oil cooler which is smaller and
I'm still trying to figure out where to put it.
Someone suggested to put it somewhere near the radiator
water bottle but I can't figure out where to hang it in there.
Thanks for all the help in advance.
Jay.
Good luck