Movements in engine temperature (picture)
Registered User
Joined: Jun 2001
Posts: 822
From: Lawrence, KS, USA
Re: Movements in engine temperature (picture)
Correct me if I'm wrong, but I remember reading in either CHP or HOTROD magazine that 210-220*F was optimal for fuel efficiency & full combustion on the LT1...I'm not saying his car doesn't have a problem, but as long as it doesn't exceed this amount, why worry?
Registered User
Joined: Dec 1969
Posts: 27,725
From: Little Rock, AR
Re: Movements in engine temperature (picture)
Originally Posted by HardcoreRM125
Thanks Shoebox
So does that mean it would be possible then if there was a overheat condition for it to overheat the tranny fluid as well to the point where it could make it slip and stuff?
In a way I want to say yes? But I keep thinking that many cars dont even have a tranny cooler on them so the extra heat from that would not nearly be enough to cause the transmission fluid to rise high enough to produce any kind of negitive affect.
So does that mean it would be possible then if there was a overheat condition for it to overheat the tranny fluid as well to the point where it could make it slip and stuff?
In a way I want to say yes? But I keep thinking that many cars dont even have a tranny cooler on them so the extra heat from that would not nearly be enough to cause the transmission fluid to rise high enough to produce any kind of negitive affect.
Thread Starter
Registered User
Joined: Sep 2005
Posts: 23
From: Copenhagen/Denmark
Re: Movements in engine temperature (picture)
Originally Posted by shoebox
I would say that as long as the engine temp is in an acceptable range, the transmission should be ok, too. Even when people have the engine overheat, it does not seem to affect the transmission. Long periods of overheating would not be good for the transmission, though. Remeber that most peolple shut the engine off when they notice overheating and give things a chance to cool. Most any car that has an automatic transmission has some method installed to cool the fluid.
Thanks for your replies!
/Thomas Krath
Registered User
Joined: Nov 2001
Posts: 719
From: Summerfield, NC USA
Re: Movements in engine temperature (picture)
if you have a low temp thermostat in the car, you will see fluctuations in the temperature like this since the fans aren't supposed to kick on till 210.
A4s have a factory oil cooler that has a hose coming off the water pump down to a sandwich cooler design on top of the oil filter, return line goes back to the driver's side tank of the radiator, tranny cooler is in the pass. side radiator tank. (vettes did not come w/ the oil cooler option since they run synthetic oil, no need for it)
Thomas, this is an oddball idea, but check your brakes to make sure the lights are working. The TCC get power off of the brake light switch. The brake switch (above the rubber foot pedal mounted to the bracing) provides +12V to the tcc circuit enabling it to engage while driving. As soon as you hit the brakes and the lights come in, it pulls power from the circuit disabling the clutch so you can come to a stop. You can get a circuit tester and check to make sure you have +12v coming to the brake switch, then press the brake w/ your hand and check the other wire to see if the power redirects, I'ts been a while but I think they are orange for power, white, and some other color, sorry I can't be more detailed.
good luck!
A4s have a factory oil cooler that has a hose coming off the water pump down to a sandwich cooler design on top of the oil filter, return line goes back to the driver's side tank of the radiator, tranny cooler is in the pass. side radiator tank. (vettes did not come w/ the oil cooler option since they run synthetic oil, no need for it)
Thomas, this is an oddball idea, but check your brakes to make sure the lights are working. The TCC get power off of the brake light switch. The brake switch (above the rubber foot pedal mounted to the bracing) provides +12V to the tcc circuit enabling it to engage while driving. As soon as you hit the brakes and the lights come in, it pulls power from the circuit disabling the clutch so you can come to a stop. You can get a circuit tester and check to make sure you have +12v coming to the brake switch, then press the brake w/ your hand and check the other wire to see if the power redirects, I'ts been a while but I think they are orange for power, white, and some other color, sorry I can't be more detailed.
good luck!
Registered User
Joined: Jul 1998
Posts: 371
From: The Hutch, TX
Re: Movements in engine temperature (picture)
Originally Posted by toby360
I once had a quirky overheating problems ONLY on the highway at higher speeds. If i slowed down the temps would go back to normal.. weird huh? What it was was infront of the radiator towards the lights there is a plastic panel that is attached to another plastic panel by two plastic push-in tacks. The tacks had fallen off or not been replaced by my mechanic after my engine rebuild a while back. When i was driving fast enough the plastic flap (which would normally be held back by being attached to the other panel) would get sucked onto the surface of the radiator blocking maybe 1/3 of its airflow.
just an idea....
just an idea....
that is something to consider. look for ANYTHING that might block the radiator at highway speeds
Registered User
Joined: Dec 1969
Posts: 27,725
From: Little Rock, AR
Re: Movements in engine temperature (picture)
Originally Posted by Hotwire
if you have a low temp thermostat in the car, you will see fluctuations in the temperature like this since the fans aren't supposed to kick on till 210.
A4s have a factory oil cooler that has a hose coming off the water pump down to a sandwich cooler design on top of the oil filter, return line goes back to the driver's side tank of the radiator, tranny cooler is in the pass. side radiator tank. (vettes did not come w/ the oil cooler option since they run synthetic oil, no need for it)
...
good luck!
A4s have a factory oil cooler that has a hose coming off the water pump down to a sandwich cooler design on top of the oil filter, return line goes back to the driver's side tank of the radiator, tranny cooler is in the pass. side radiator tank. (vettes did not come w/ the oil cooler option since they run synthetic oil, no need for it)
...
good luck!
Stock fans don't come on until 226°.
Thread Starter
Registered User
Joined: Sep 2005
Posts: 23
From: Copenhagen/Denmark
Re: Movements in engine temperature (picture)
Originally Posted by Hotwire
if you have a low temp thermostat in the car, you will see fluctuations in the temperature like this since the fans aren't supposed to kick on till 210.
A4s have a factory oil cooler that has a hose coming off the water pump down to a sandwich cooler design on top of the oil filter, return line goes back to the driver's side tank of the radiator, tranny cooler is in the pass. side radiator tank. (vettes did not come w/ the oil cooler option since they run synthetic oil, no need for it)
Thomas, this is an oddball idea, but check your brakes to make sure the lights are working. The TCC get power off of the brake light switch. The brake switch (above the rubber foot pedal mounted to the bracing) provides +12V to the tcc circuit enabling it to engage while driving. As soon as you hit the brakes and the lights come in, it pulls power from the circuit disabling the clutch so you can come to a stop. You can get a circuit tester and check to make sure you have +12v coming to the brake switch, then press the brake w/ your hand and check the other wire to see if the power redirects, I'ts been a while but I think they are orange for power, white, and some other color, sorry I can't be more detailed.
good luck!
A4s have a factory oil cooler that has a hose coming off the water pump down to a sandwich cooler design on top of the oil filter, return line goes back to the driver's side tank of the radiator, tranny cooler is in the pass. side radiator tank. (vettes did not come w/ the oil cooler option since they run synthetic oil, no need for it)
Thomas, this is an oddball idea, but check your brakes to make sure the lights are working. The TCC get power off of the brake light switch. The brake switch (above the rubber foot pedal mounted to the bracing) provides +12V to the tcc circuit enabling it to engage while driving. As soon as you hit the brakes and the lights come in, it pulls power from the circuit disabling the clutch so you can come to a stop. You can get a circuit tester and check to make sure you have +12v coming to the brake switch, then press the brake w/ your hand and check the other wire to see if the power redirects, I'ts been a while but I think they are orange for power, white, and some other color, sorry I can't be more detailed.
good luck!
I will print out all your replies and give them to my mechanic.
Thanks
Thomas Krath
Registered User
Joined: Nov 2001
Posts: 719
From: Summerfield, NC USA
Re: Movements in engine temperature (picture)
Originally Posted by tkrath
Okay thanks - I will check, but I believe everything is fine.
I will print out all your replies and give them to my mechanic.
Thanks
Thomas Krath
I will print out all your replies and give them to my mechanic.
Thanks
Thomas Krath
Thanks to Rob, look over towards the upper right hand side of the "B" schematic and you'll see what I'm talking about as far as the brake switch / tcc circuit. This was also on a 95, I worked on a 94 LT1 installing it in a 89 S-10, so my colors are WAY off, not sure if they carried this design through to 96-97 or not, but one way to look at the problem.
good luck!
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