Coolant temps rise when car off
Thread Starter
Safety Car
Joined: Jun 2011
Posts: 4,352
Likes: 32
From: Canton Michigan
Coolant temps rise when car off
Pretty much.. I tried to do some searching on my phone couldnt find much.. When i am driving car will go between 210-230.. ( i do have a A&A intercooler installed) blow is not installed yet just piping..
But anyways car will say be at 219 when i shut it off. If i turn the car back on ( not start ) i can watch the coolant temps go up to about 240-255.. I have done the trick where you unplug the T block it up blow on the over flow tube and that did not work. So looking for other suggestions..
My other question is i will be getting a tune soon( BY Dr Phil). What temp should i have the fan come on and is it possible to have fan run for 30secs or a min idc after car is off to keep cooling?
But anyways car will say be at 219 when i shut it off. If i turn the car back on ( not start ) i can watch the coolant temps go up to about 240-255.. I have done the trick where you unplug the T block it up blow on the over flow tube and that did not work. So looking for other suggestions..
My other question is i will be getting a tune soon( BY Dr Phil). What temp should i have the fan come on and is it possible to have fan run for 30secs or a min idc after car is off to keep cooling?
Thread Starter
Safety Car
Joined: Jun 2011
Posts: 4,352
Likes: 32
From: Canton Michigan
i am wondering if I just never noticed it before.. And now i am looking at it because of all the work and stuff was done I am keeping a eye on everything closely..
Race Director
Joined: May 2004
Posts: 16,667
Likes: 1,209
From: Raleigh, NC
St. Jude Donor '15
It depends on how long it sits. If it just sits a few mins you'll see the temps go up the most (in my experience anyways). After it sits for 30+ minutes it seems to start going down
I've noticed the same on mine during quick restarts
It's just the heat from the cylinders continuing to heat the water & sensor in the block. Since the water isn't moving at that point, it heats up for a bit, then levels off, then cools back off
I've noticed the same on mine during quick restarts
It's just the heat from the cylinders continuing to heat the water & sensor in the block. Since the water isn't moving at that point, it heats up for a bit, then levels off, then cools back off
Thread Starter
Safety Car
Joined: Jun 2011
Posts: 4,352
Likes: 32
From: Canton Michigan
It depends on how long it sits. If it just sits a few mins you'll see the temps go up the most (in my experience anyways). After it sits for 30+ minutes it seems to start going down
I've noticed the same on mine during quick restarts
It's just the heat from the cylinders continuing to heat the water & sensor in the block. Since the water isn't moving at that point, it heats up for a bit, then levels off, then cools back off
I've noticed the same on mine during quick restarts
It's just the heat from the cylinders continuing to heat the water & sensor in the block. Since the water isn't moving at that point, it heats up for a bit, then levels off, then cools back off
Safety Car
Joined: Oct 2000
Posts: 4,080
Likes: 565
From: Allen TX
Pretty much.. I tried to do some searching on my phone couldnt find much.. When i am driving car will go between 210-230.. ( i do have a A&A intercooler installed) blow is not installed yet just piping..
But anyways car will say be at 219 when i shut it off. If i turn the car back on ( not start ) i can watch the coolant temps go up to about 240-255.. I have done the trick where you unplug the T block it up blow on the over flow tube and that did not work. So looking for other suggestions..
My other question is i will be getting a tune soon( BY Dr Phil). What temp should i have the fan come on and is it possible to have fan run for 30secs or a min idc after car is off to keep cooling?
But anyways car will say be at 219 when i shut it off. If i turn the car back on ( not start ) i can watch the coolant temps go up to about 240-255.. I have done the trick where you unplug the T block it up blow on the over flow tube and that did not work. So looking for other suggestions..
My other question is i will be getting a tune soon( BY Dr Phil). What temp should i have the fan come on and is it possible to have fan run for 30secs or a min idc after car is off to keep cooling?
Assuming you have a 160^ or 178^ t-stat installed, have the fans turned on at 190-200^ or so. Lower temp t-stats do no good if the fans are not reprogrammed to compensate for the lower temp t-stat.
You can certainly have a manual override toggle mounted so that you can run the fans after shutdown for as long as you want. I've done that for cars I raced at the drag strip often.
Race Director
Joined: May 2004
Posts: 16,667
Likes: 1,209
From: Raleigh, NC
St. Jude Donor '15
I set mine to start coming on in the high 190's and ramp up to 90% around 210. I haven't had any problems with coolant temps so that has worked fine for me. Very rarely see 210.
Team Owner
Joined: Mar 2008
Posts: 21,502
Likes: 462
From: Southern Utah
The heat soak phenomenon is more dramatic if the car is shut off after driving up a long hill. The cooling system keeps up until the water pump and fan are shut off, then temps rise. Also,it can ruin a turbocharger because the oil flow stops but the turbo is still very hot. After being run up a hill, a turbocharged car or truck should be idled for a couple of minutes before shutting it off.
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Thread Starter
Safety Car
Joined: Jun 2011
Posts: 4,352
Likes: 32
From: Canton Michigan
I might have to do the manual switch for now. Until I get tuned..
Would u happen to have a link to a write up on how to do that or what needs to be done for that. And what's a good temp to turn em on. And is running them to long bad? I mean I get they can wear out faster.
Would u happen to have a link to a write up on how to do that or what needs to be done for that. And what's a good temp to turn em on. And is running them to long bad? I mean I get they can wear out faster.
As has been stated, the temps will rise for a bit after shutdown b/c coolant is no longer being circulated through the block. However, 240-255 seems high to me.
Assuming you have a 160^ or 178^ t-stat installed, have the fans turned on at 190-200^ or so. Lower temp t-stats do no good if the fans are not reprogrammed to compensate for the lower temp t-stat.
You can certainly have a manual override toggle mounted so that you can run the fans after shutdown for as long as you want. I've done that for cars I raced at the drag strip often.
Assuming you have a 160^ or 178^ t-stat installed, have the fans turned on at 190-200^ or so. Lower temp t-stats do no good if the fans are not reprogrammed to compensate for the lower temp t-stat.
You can certainly have a manual override toggle mounted so that you can run the fans after shutdown for as long as you want. I've done that for cars I raced at the drag strip often.
Safety Car
Joined: Oct 2000
Posts: 4,080
Likes: 565
From: Allen TX
https://www.corvetteforum.com/forums...tall-pics.html
Doesn't have a schematic, but I'm sure there are those on here too somewhere if you search.
Doesn't have a schematic, but I'm sure there are those on here too somewhere if you search.
Tech Contributor
Joined: Jul 2002
Posts: 14,950
Likes: 264
From: St. Louis, MO
St. Jude Donor '08
You realize that running the fan won't cool the engine off if it's not running? If you want to cool the engine when it's not running you need to install an electric water pump and run it.
Beware battery drain, the fan and a pump draw a few amps.
Frankly I wouldn't worry about the heat after you shut it off. As already stated, this really only matters for turbo cars, every car on the road heats up like this and it's not a problem.
Beware battery drain, the fan and a pump draw a few amps.
Frankly I wouldn't worry about the heat after you shut it off. As already stated, this really only matters for turbo cars, every car on the road heats up like this and it's not a problem.
Thread Starter
Safety Car
Joined: Jun 2011
Posts: 4,352
Likes: 32
From: Canton Michigan
You realize that running the fan won't cool the engine off if it's not running? If you want to cool the engine when it's not running you need to install an electric water pump and run it.
Beware battery drain, the fan and a pump draw a few amps.
Frankly I wouldn't worry about the heat after you shut it off. As already stated, this really only matters for turbo cars, every car on the road heats up like this and it's not a problem.
Beware battery drain, the fan and a pump draw a few amps.
Frankly I wouldn't worry about the heat after you shut it off. As already stated, this really only matters for turbo cars, every car on the road heats up like this and it's not a problem.
Tech Contributor
Joined: Jul 2002
Posts: 14,950
Likes: 264
From: St. Louis, MO
St. Jude Donor '08
Certainly your tuner will know this but be sure you don't go above 90% on any temp or you'll burn up your fan connector. And if you command more than 25% in the lowest cell, 192, the fan will run all the time full blast and you don't want that.
More info and pics.
https://www.corvetteforum.com/forums...my-08-z51.html
More info and pics.
https://www.corvetteforum.com/forums...my-08-z51.html