I have a 1990 model car. I always take note of the temperature gauge before stopping the engine from a long drive, but as soon as i switch on the ignition key (without starting the engine), like after a minute or two, i notice that the gauge reads a lot higher than when i previously switched the engine off. I am at a loss because a friend told me, that as soon as you stop the engine the tendency is that the engine will immediately cool down. And that there is no way that the reading should go "up" , even when you turn the key on without starting the engine.
Should this really happen or do i have to buy a new set of temperature gauge?
2007-10-13 04:06:00 · 10 answers · asked by Anonymous in Cars & Transportation ➔ Maintenance & Repairs
Actually, it's quite normal for your car engine temperature to go up a bit after shutting the engine off. What's happening is that the cooling system has stopped flowing coolant, but there are still a couple of hot spots (cylinder heads, exhaust manifolds, etc) that are warmer than the rest of the engine. The temperature sensor mounted in the engine will notice a slight rise in temperature before it starts cooling down again.
2007-10-13 04:16:17 · answer #1 · answered by JetDoc 7 · 1⤊ 0⤋
Don't forget that, with the engine off, the coolant isn't circulating. While the temperature sensor measures the average coolant temperature when it is circulating, it might be subject to local fluctuations for a while thereafter.
The real question is whether the temperature gauge reads correctly while you are driving and, if it reads "low" when the car has been off for sufficient time for all the coolant to reach ambient temperature. If so, your gauge might be OK.
2007-10-13 04:13:55 · answer #2 · answered by LucaPacioli1492 7 · 0⤊ 0⤋
This is an easy one. While the engine is running the radiator cools the engine thus the thermostat is reading the cooled antifreeze. When the engine is stopped the temperature climbs because the antifreeze is now absorbing the heat from the engine block and is not being cooled, thus you get a higher reading. Just make sure it doesn't exceed the manufacturers suggested operating temperature.
2007-10-13 04:12:36 · answer #3 · answered by pbonck 2 · 3⤊ 0⤋
Is yours a diesel engine or petrol engine?
Maybe diesel engines need heaters to warm the cylinders up to start ignition easily. However, the little heater will not raise the high heat capacity of the engine coolant (water) in the engine. So, i doubt your temperature gauge is wrongly placed or in contact with metals.
2007-10-13 04:17:46 · answer #4 · answered by Anonymous · 0⤊ 0⤋
The temperature reads higher beacuse the fan is not on. Therefore the engine is not getting any cool air. When your car is running the fan is sending cool air to the engine thats why the temperature reads lower.
2007-10-13 04:12:13 · answer #5 · answered by Lagunillo 3 · 0⤊ 0⤋
Your friend is wrong.
When an engine is running, so is the cooling system (liquid coolant, and the fan).
Stop the engine, and you also stop the cooling system, so for a short time after turning the engine off the temperature may indeed raise a little.
2007-10-13 04:09:54 · answer #6 · answered by Anonymous · 2⤊ 0⤋
Well my thoughts after the game are this: Pedro in my mind still should be in the bullpen because it was around the 5th inning that he started losing velocity and that's when he started getting beat up BUT I heard that Jaime Moyer hasn't been doing well so that is the only reason for me to keep Pedro in the rotation because even though he was losing velocity his change-up still looked good, now about the Phillies killing the Cubs last night the only thing that really bothered me is this: idk what inning it was well a Cubs player lofted a fly ball to deep center field and Shane Victorino glided under it as usual and caught it, but as he caught it some jerk off of a fan threw beer on him as he was a catching it, in a juvenile attempt to thwart his catching of the ball, I mean really folks are you that stupid and probably risk that you could never go back to Wrigley Field, or any other baseball park again? I mean really stop being immature
2016-05-22 05:32:03 · answer #7 · answered by tamra 3 · 0⤊ 0⤋
your friend is WRONG. when you shut the engine off, the engine get hotter because the waterpump is not pumping the hot coolant to the radiator to cool it down. most vehicles turn the radiator fan on for few minutes after the engine is turn off to cool down the engine .
2007-10-13 04:15:40 · answer #8 · answered by LEXUSRY 5 · 0⤊ 0⤋
Yep sounds like a faulty gauge to me!
2007-10-13 04:12:29 · answer #9 · answered by ian_hndly 2 · 0⤊ 2⤋
its a glitch in the gauge
2007-10-13 04:09:07 · answer #10 · answered by Anonymous · 0⤊ 1⤋