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

The exact time taken depends upon various factors: The ambient temperature The amount of heat insulation in the engine bay Volume of coolant in the engine How hot the engine got while driving ...
motosubatsu's user avatar
  • 10.1k
8 votes

The purpose of covering the grill during cold weather

This is old, but some of these comments annoy me. I live in Fairbanks AK and drive a 90's diesel Chevy. It takes a 15 minute idle period (in addition to at least an hour with the block heater plugged ...
Justin in Alaska's user avatar
8 votes
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Water temperature randomly drops while car is in motion (VW Golf Mk6)

It can be: a sticky thermostat Hard to diagnose properly without an independent thermometer, because a lot of modern cars show 90C at the dashboard while the temperature varies between 75C and 125C. ...
fraxinus's user avatar
  • 2,082
7 votes
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Grille cover for '95 civic EG without AC for cold weather protection of engine

From what I remember from my Civic driving days, the radiator in that car only extends half way across the grill of the car, and the other half is blocked off by a plastic cover as you mentioned. ...
MooseLucifer's user avatar
  • 6,007
7 votes

Water temperature randomly drops while car is in motion (VW Golf Mk6)

I think you can probably boil it down to (no pun intended, lol) a bad thermostat. It sounds as though its just not working as intended. You can pretty much eliminate the ECU as part of the problem, ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
6 votes

The purpose of covering the grill during cold weather

An anectodal answer to this... Back in the '70s I owned a Moskvich 412, a Russian car built to survive in Siberia. This had a brass venetian blind arrangement in front of the radiator that could be ...
Chenmunka's user avatar
  • 1,432
6 votes

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

I would seriously look at improving your oil cooler. I doubt going "larger" is the immediate solution, I'm betting it's the airflow across the heat exchanger. Relocate the cooler, modify/improve the ...
SteveRacer's user avatar
  • 12.4k
6 votes

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

Let's see. 80 km/h is 22.22 m/s, and the kinetic energy is 0.5*1200 kg*(22.22 m/s)^2 = about 300 kJ. Brake rotor is initially at 20 degrees Celsius and now rose to 100 degrees Celsius. That's a 80 ...
juhist's user avatar
  • 14.6k
6 votes

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

My first suspicion is with the thermostat. It may be failing "slow" which means it's not opening when it should and it takes the much higher temperature and pressure of the hot coolant to ...
jwh20's user avatar
  • 12.1k
5 votes

Malfunctioning Ambient Temperature Gauge - 2004 Subaru Forester

Sounds like the temperature sensor is broken. A new one is $40-$55, and it's a 30 minute job to replace if you've never done it before (it lives behind the grill in front of the radiator). Not ...
PeteCon's user avatar
  • 8,712
5 votes
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Can improper coolant concentration increase coolant temperature?

The coolant ratio does affect how the system cools the engine, but probably not as you'd think. Water is a better thermal conductor than is the antifreeze, so it will do a great job of shedding the ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
5 votes

Is it better for your vehicle to let it warm up before driving it?

Both of you are partially right. The engine oil should be warmed properly before hauling ass. Most cars don't have an oil temperature sensor and display for it, so as a rule of thumb it can be said ...
juhist's user avatar
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5 votes
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Is it bad to immediately crank the air conditioning all the way up when you start your car on a really hot day?

I live in a very hot climate. There is no issue in turning on a properly-functioning A/C to its maximum setting at startup. Turning the A/C on activates the refrigeration cycle, which at startup will ...
Zaid's user avatar
  • 39.2k
5 votes
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Is it normal for the wheels to be over 100C hot after a few kilometers of driving?

The hottest part of the wheels after driving will be the brake discs which can easily exceed 100 °C. In this video, Jason puts a thermal imaging camera to good use. Temperatures exceed 140 °C:
Zaid's user avatar
  • 39.2k
5 votes

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

If you have any doubts, don't do any of this, just wait til the system is cool to the touch. Steam is extremely dangerous! With that said, you can open the system a lot sooner than a matter of hours, ...
R.. GitHub STOP HELPING ICE's user avatar
5 votes

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

Vehicle manufacturers quote recommended pressures with the tire cold (meaning: not immediately after driving) and at "typical" atmospheric conditions. Essentially, they're quoting the pressure at room ...
dwizum's user avatar
  • 1,144
4 votes

Thermocouple vs Thermostat

A thermocouple merely generates voltage according to the temperature, while an automotive thermostat is basically an autonomous temperature sensitive coolant valve. You can't replace a thermostat with ...
I have no idea what I'm doing's user avatar
4 votes
Accepted

Engine temperature range?

I'm guessing you've got a 13 psi radiator / cooling system cap. The 13 PSI number is pretty standard for GM cars. At that pressure, water doesn't boil (from liquid to vapor) until 245 deg F or so. ...
zipzit's user avatar
  • 6,539
4 votes
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Suzuki Swift running cold - replaced thermostat and the issue persists

The heater core may be plugged, if fluid is full and there aren't any leaks. Check this when the engine is hot, if one hose is cold or warm and the other is hot the heater core is plugged. The temp ...
Ben's user avatar
  • 10.7k
4 votes

Tire showing low pressure after few KMs of ride

I think you have pressure loss on your bead, pressure sensor or Schrader valve Regardless of the tire holding N2 or straight atmospheric gasses, all of the same principles apply to pressure loss. ...
DucatiKiller's user avatar
  • 32.9k
4 votes
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Does the dash temperature sender unit also provide input to the ECU?

For your 626, I'm seeing two different temp sensors listed. I'm seeing this single bladed one: Which shows to be associated with the gauge. I also see this two bladed one: Which I assume is for the ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
4 votes

Car temperature drops to a little less than 1/4 at highway speeds. Any reason to be concerned?

I'd lean toward the thermostat. It sounds like it may be getting warmed up and opening up in the city driving, then staying stuck open once you're on the highway. Depending on conditions (primarily ...
kyle_engineer's user avatar
4 votes
Accepted

Does outside temperature sensor affect the HVAC system?

No, the outside temperature sensor should not affect the HVAC. That sensor is only there to give you the outside temperature reading on your dash. Modern climate control systems use temperature sensor(...
Kitsunemimi's user avatar
4 votes

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

It "sounds" as though from your explanation your thermostat is staying open partially when the engine is cooled to normal levels. When you're travelling down the road, there is a greater flow of air ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
3 votes
Accepted

Proper operating temp for a 1983 Mercedes 380SL?

Nope that sounds about perfect. Remember there is a spring on the radiator cap that keeps the engine coolant pressure to around 13 PSI for most manufacturers. Water doesn't boil until around 242°F (...
zipzit's user avatar
  • 6,539
3 votes

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

Hmm. Either temp sender calibration is off a little bit or it's colder inside the car than it is outside the car. Remember when you are in Defrost or Defog modes on your Heating Ventilation Air ...
zipzit's user avatar
  • 6,539
3 votes

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

The most likely scenario is that you only have a single malfunction: your thermostat. If it's open all the time, the engine will take much longer to get up to temperature (as you've noticed), and some/...
tlhIngan's user avatar
  • 12.2k
3 votes

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

At the very least, the thermostat should be changed since it really isn't an expensive or intensive repair. Was this done while you were at the mechanic? This would certainly solve the temp gauge and ...
Andrew L's user avatar
  • 321
3 votes

2012 chevy equinox blows hot air even shut off

This feels like a broken blend door. A blend door controls how much air is allowed to flow past the heater core, or past the a/c evaporator. A broken door means that air physically stuck going past ...
Lynn Crumbling's user avatar
3 votes

Engine temperature range?

The thermostat opens at 180 degrees F, this sets the lower limit. The fans come on in low speed mode at 223 degrees F. The fans come on in high speed mode at 230 degrees F. So temperature can and will ...
Fred Wilson's user avatar
  • 11.6k

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