ok whell i got normal temps here ins florida 97 max if its scorching hot and in traffic, but normally 96-95, so now my question is i noticed after parking the car and turning it off, even with the hood open, i turn on the elctrical to read my pfc and the temps just keep rising. is this normal, why does this happen, and any way to keep it down? I dont want anything getting damaged.

 

I cannot say it for sure, but it sounds normal to me.
I think I posted something along that line a bit back and that's pretty much the answer I got.
I can tell you that if I shut the car off and the fans are not running, wait a few seconds and then just turn the key one click over without starting the car, the fans will go on and stay on (for how long they would do that, I don't know).

 

I have a VW VR6 electric water pump to pull water from the hose adjacent the spark plugs and circulate it to the heater line. The pump is wired to a temp sensor set at 200F. Once I shut off, it does not go higher than the temperature right at shut off.

 

It's normal. It happens because the water is not circulating when the engine is off, which causes the water in the engine to heat soak, which is where the temp sensor is. But the water in the radiator will be cooling because there is nothing to make it heat soak. So if you let the car set for say 5 min turn it to the on position read the temps it will probably be 100+ and if you crank it up after 10sec or so, once the water circulates out of the radiator, it should drop back down to what it was when you cut it off.

 

If you think about how the cooling system works, you'll see that pretty much all cars have this problems.

Your cooling system works by circulating hot coolant through the radiator which cools it by having air running through it. Without air running through the radiator, it cannot cool the coolant. Add in that the coolant stops circulating, and the engine has to deal with simply radiating the heat out like a stove. So you end up with some parts heat soaking. This also why it's not a great idea for turbo timers for cars with water cooled turbos as you have no air running over the radiator and oil coolers while the car is running from the timer.

The best idea is to drive the car conservatively before you get to your destination. This will allow the car to cool and be at a lower temperature prior to shutting off the engine.

 

hum i see, i understand. Now an electrical water pump, if you get one of thos, do you have to modify anything?, prob wont be getting it anytime soon or anything. now that i understand i guess ill let it cool for couple mins then start it again

 

IMHO, starting it again after sitting a few minutes is a bit much. Little or no benefit and inconvenient. Just drive it easy for a minute or two before turning it off.

 

I have a HKS turbo timer and after I've let my turbos go thru their cool-down and the car shuts off I turn the switch (but do not crank the car) to reactivate the turbo timer and set it for 10 minutes and then pull my key out and walk away. The fans immediately cut on and run for 10 minutes and my temps slowly begin to fall. My driving temps are around 92c and when I shut the car off it sometimes climbs to 100-102c but comes back down to around 95c after the 10 mintues of the fans running. I know 10 minutes isn't long enough to cool an entire system but it helps control the temps from skyrocketing. And for those of you worried about battery life with doing this, I've been doing this for over a year with no ill effects.

 

Hus i do that but my battery dies out if i do it for 10 mins.

 

seems like i have another little problem... driving tonight decently warm not like in the mornings and afternoons (scorching hot), i saw on the drive tonight about 54 air temp and 99 water temp... on the highway doing about 75-80... now would you call that minorly overheating? also i had the air condition on at 1 almost the whole time since the gf dont like the windows down (hair and bla bla bla).. so any ideas?

 

No.