Questions tagged [temperature]

Use for questions where temperature is a significant feature – e.g., problems that occur only at a specific temperature.

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16
votes
7answers
48k views

How exactly does running fuel-lean increase the temperature of ignition?

I learned in this question that running an engine fuel-lean will increase the temperature of ignition, among other things such as causing problems with the catalytic converter. I have no idea how or ...
15
votes
3answers
103k views

How is “outside temperature” measured in a car?

Most cars have a display for outside temperature, and I have been wondering how it was measured... In other words, where exactly is the sensor and how reliable is it?
13
votes
3answers
34k views

The purpose of covering the grill during cold weather

In some countries it is quite popular to cover up the front grill in winter (especially on diesel engined cars). As I understand the intention is to inhibit airflow to the radiator, but why would you ...
11
votes
5answers
117k views

Car won't reach operating temperature

Here's a seemingly simple problem - I noticed that the temperature gauge of my mother's 2004 Opel Meriva 1.7CDTI won't ever climb above minimum. I checked the OBD readings to see if it was a defective ...
9
votes
4answers
90k views

How long should I wait for engine to cool down before I can check coolant?

I know engine temperature should go down to "C" mark before opening radiator cap. However I'm finding that the temp just stays on normal for a long time. I think I've read people say you need to give ...
9
votes
3answers
71k views

Does revving a car when cold make it warm up faster?

As winter comes along, I've always thought that revving the car would make it warm up faster, so the heating works better to clear the icy/steamed up windows. Does revving my car at idle to about 2-...
9
votes
1answer
637 views

What effect will replacing manifolds with headers have on oil temperature?

I drive a big heavy car (2011 Mercedes E63, somewhere around 4200lbs) that I take to the track. It has the NA 6.3L engine (M156) with no modifications. I struggle with oil temperature issues on hot ...
8
votes
3answers
72k views

Normal Operating Temp for an Automatic Transmission

While I was able to find information on testing the ATF temperature sensor in the GF4A-EL manual I've got: I was unable to find any info on the normal operating temperature of the transmission. I'm ...
7
votes
5answers
27k views

Is it normal for the wheels to be over 100C hot after a few kilometers of driving?

I drove my car from my parking to a spot where I can wash my car 3.5 km away. I thought it might be a good idea to clean the rims, so I splashed water towards the front wheel. To my surprise, steam ...
7
votes
6answers
23k views

Why outside temperature displays a warning at 4 degrees?

I know that water behaves strangely once the temperature drops below 4 (celsius) degrees. In a nutshell, its volume starts to expand (see wiki for further details) below 4 degrees - when temperature ...
7
votes
1answer
3k views

Malfunctioning Ambient Temperature Gauge - 2004 Subaru Forester

I own a 2004 Subaru Forester XS with 102,000 miles on it and required service and inspections just completed. Now the Ambient Temperature Gauge keeps malfunctioning - often sticks at 77; after a ...
7
votes
2answers
865 views

Water temperature sensor location

I'm installing a water temperature gauge and I'm curious which is the best location for the sensor; in the radiator inlet hose or outlet hose? The inlet hose will give the hottest reading as the ...
7
votes
3answers
9k views

Possible causes for a high temp gauge?

I have a 2012 Chevy Colorado with an odd temp gauge issue. When the vehicle is started from being completely cold (like freezing cold), the temp gauge immediately goes all the way up. This leads me ...
6
votes
1answer
832 views

why is it not good to stall a cold engine

I've always known that you cannot stall (regular turn off by turning key (i'm not sure how that's called in english)) an engine if it is not yet reached it's work temperature. For example, if i go to ...
6
votes
3answers
3k views

Engine temperature range?

Our 'new' ('07) Cobalt has a digital temp readout. Temperature varies substantially, depending on driving conditions - I've seen it as high as 210(F) on city streets, on a not-very-warm day. Our old ...
6
votes
2answers
1k views

Why does my engine temperature go all the way up before coming back to the center when I start my car?

When I first start my car the last few days (A 2008 Toyota Camry that I've had since it was new in 2007, 13 years) the temperature needle ends up slowly climbing past the halfway point all the way to ...
6
votes
2answers
7k views

How exactly does an increase in engine temperature cause a car to breakdown?

I have an engine temperature gauge on the dashboard of my car (as most people do), but if for some reason the engine temperature is caused to increase (due to a lack of cooling or what have you), the ...
6
votes
1answer
643 views

Does the dash temperature sender unit also provide input to the ECU?

The temperature gauge on my 98 Mazda 626 2L MTX recently went all wonky, most of the time it's pegged low, but sometimes in just jumps around, but never above the actual temperature of the engine. ...
5
votes
1answer
202 views

Grille cover for '95 civic EG without AC for cold weather protection of engine

So I have a 1995 Civic hatchback without AC. No AC installed from factory. The car has a radiator on the right half of the front of engine compartment (instead of covering the entire front of the ...
5
votes
1answer
92 views

Tire showing low pressure after few KMs of ride

I am having this question from long back. I am using N2 for my tyres. After a few KM (say some 3-4 KMs), measuring the PSI, shows a less pressure. Whether, due to the increase in the temperature in ...
5
votes
2answers
6k views

2012 chevy equinox blows hot air even shut off

We have a 2012 Chevrolet Equinox. We cant turn off the interior heat even when we turn the temp all the way down. Even when we turn off the heater it keeps blowing hot air. What could be the ...
5
votes
3answers
9k views

Problem with Temperature rising after 30 minutes of driving?

I have a Mitsubishi Galant 2003, 2.4L engine with 234k miles on it. When I drive it the temperature gauge gets up to exactly midway, until exactly 30 minutes. Then it goes up to about 2/3 or 3/4 of ...
5
votes
2answers
4k views

2006 Jeep Commander - heat problems

My heater blows cold air at idle. and warms when driving. my temperature gauge goes up when the air is blowing. What could it be?
5
votes
2answers
10k views

what is the normal operating temperature indication on the guage?

My radiator got a leakage so I made a direct connection to the fan from the battery i.e. irrespective of the engine temperature the fan would start as soon as you turn on the ignition switch on. It ...
5
votes
0answers
298 views

Chevy Malibu 2009 coolant sensor

I have a problem with my malibu, I got a code on the obdii reader as though the coolant temperature reading is not correct, so in the car lcd on the instrument cluster I can see Coolant temperature : -...
4
votes
3answers
2k views

What causes more gas consumption - Idling with AC or Heat?

So I have begun doing some research on the effects of idling. So my question is, does idling with the AC or heater on affect how much gas is given off? If possible, please give the percent of extra ...
4
votes
3answers
758 views

Should I be pumping air to a higher pressure when the weather is hot?

There have been a couple of questions about tyre air pressures at low temperatures: 1, 2. But what about at high temperatures? Currently in Australia daily highs of 35C are common, spiking up to 38 ...
4
votes
2answers
33k views

What could cause the engine temperature gauge and AC to fail simultaneously?

On Wednesday I noticed my car's temp gauge reading at bottom while driving down the highway. The air conditioner was also non-functional. Each of these components were working fine the day before. The ...
4
votes
1answer
4k views

Engine temperature low when it's cold outside

My engine temperature is low when it's cold outside. I'll drive for 30 min, and the engine temperature will be at the quarter mark. If it's moderately cold outside, the temperature will eventually ...
4
votes
3answers
2k views

Audi A4 1.6 2000 Coolant level sensor flashing

I have a problem with the coolant level sensor. After a minute of driving the temperature sensor on the car starts flashing and also alerts with beeping. Of course the coolant tank level is normal. ...
4
votes
1answer
826 views

Is it bad to immediately crank the air conditioning all the way up when you start your car on a really hot day?

There have been times in the summer when my car is in my driveway all day in 100-degree weather, and combined with the sun, it must be 140+ degrees in my car. Can it damage or shorten the life of my ...
4
votes
1answer
15k views

Temperature gauge goes down when I drive for a distance, but is usually in the middle driving in town

My Volkswagen Passat V6 temperature gauge, or coolant gauge goes from normal (the needle is in the middle), then as I'm driving the gauge goes down in temperature (toward the cooler part of the gauge)....
4
votes
4answers
3k views

Does cooler air improve turbo performance?

When modifying NA cars I've always been advised to try and protect the intake from heat soak from the engine bay because the engine performs better with cooler air. This makes sense. I now have a ...
4
votes
1answer
1k views

Suzuki Swift running cold - replaced thermostat and the issue persists

My 1994 Suzuki Swift Sedan 1.3L with 280,0000 miles has been running cold for a while now. I can't get my self warm with the heater in the mornings when there is frost. It surges climbing up a ...
4
votes
1answer
746 views

Thermocouple vs Thermostat

Why don't modern engines use a thermocouple (electronic temperature sensor) instead of a (wax element) thermostat?
4
votes
2answers
2k views

Proper operating temp for a 1983 Mercedes 380SL?

My 1983 Mercedes 380SL seems to be running hotter than I like. It settles down at right at 100 C by the instrument panel temp gauge after running at highway speed for 10 minutes or so. When I first ...
4
votes
1answer
213 views

Inside temperature reading 13 degrees lower than actual outside temperature - what could be the problem?

I have a 2006 Nissan Sentra. Its inside temp is reading 58 degrees when it is actually 71 degrees outside. What could be the problem? Also, I just changed the thermostat today.
4
votes
1answer
2k views

Engine Temperature from OBD data

Engine Coolant temperature is obtained from OBD. But there is no PID to get engine temperature. Obviously, they are related, rather proportional I guess. But can there be a case where my engine is ...
4
votes
2answers
3k views

Low engine temp

2001 chevy s10 2.2 will not reach normal operating temp. First noticed when defroster was blowing cold. Replaced thermostat with Stant superstat with no change whatsoever. Coolant level is normal. Out ...
4
votes
0answers
1k views

Peugeot 207 convertible: “impossible to move roof: outside temperature too low”

My Peugeot 207 convertible from 2007 shows an error when trying to lower the roof. "Impossible to move roof: outside temperature too low" According to the manual it should be functioning down to -15 ...
3
votes
2answers
4k views

Effects of anti-freeze concentration on engine temperature

I am curious as to how useful the engine temperature sensor actually is. It tells you the coolants temperature obviously, but I have read that the engine actually operates hotter than the coolant. For ...
3
votes
1answer
3k views

Can improper coolant concentration increase coolant temperature?

Car: Audi S5 4.2L Lately I've noticed my radiator fans (both of them) running like a jet engine quite frequently (but not always, the speed varies). My coolant temp. reads around 110C via OBDII after ...
3
votes
2answers
4k views

How to replace the transmission temp sensor?

I have a 2011 Ford Fusion with the 6 speed trans. How do I replace the transmission temp sensor? I'm throwing code p1783. Engine: 3.0L. Transmission 6 speed semi automatic. Miles ~115k; Bought @ ...
3
votes
1answer
56k views

How often to start/drive a vehicle to keep it healthy?

In order to keep a gasoline-powered vehicle healthy, how often does it need to be started or driven? Please specify if it actually needs to be driven, or if just starting it and letting it run is ...
3
votes
1answer
684 views

Audi temperature gauge not working correctly

I have an Audi A3 2001 1.9TDI engine code ASV and my temperature gauge has always been acting weird - goes to 100°C or higher and then drops back to 90°C. I took my car to a local certified Audi ...
3
votes
3answers
21k views

Outside temperature displays wrong values in Peugeot 207

For some weeks now my mother-in-law's Peugeot 207 (2009 model I think) shows a wrong outside temperature. While the actual outdoor temperature has been somewhere around freezing (0°C) the temperature ...
3
votes
1answer
819 views

Can I place a mechanical water temp sensor within the radiator hose pipes?

I have a Mk1 Golf. The previous owner has put in the 3 GTi console gauges but didnt connect them. I want to connect up the water temp gauge (which is the mechanical type with a heat sensing bulb) but ...
3
votes
1answer
63 views

Ambient Air Temperature

Put a plow on my 2014 1500 Silverado after driving for about 20 minutes temperature outside reads over a hundred can i reposition sensor or remove it.
3
votes
1answer
2k views

Could oily sludge in cooling system affect engine temprature?

I have a BMW 530i 2007, the engine gets hot up o 115 degree of celcius, it actually fluctuate between 95 to 115(which is a little bit higher than normal specially when the outside temperature is 5 c) ...
3
votes
1answer
3k views

What sort of temperatures do exhaust manifolds on large engines reach after normal operation?

The main car that I was wondering for was a Nissan Altima 2.5l 4dr. 2007 with 138,000 Miles