Why does my heater only work when i driving about 40 miles per hour?

My heater will only blow out and work if i am driving above 40 mph

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Posted on Nov 06, 2012

Hi,
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Posted on Jan 02, 2017

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If 360 km per hour is equal to 40 miles per hour, please show me how to calculate using formular

360 km/hr is NOT 40 miles/hr.
1 mile is about 1.6 km
To go from km to miles, multiply by 0.62
To go from miles to km, multiply by 1.6

Kilometers per hour to Miles per hour

Feb 23, 2017 | Cars & Trucks

Tip

Save Money on Gas/Petrol

1. Avoid idling. While idling, your car gets exactly 0 miles per gallon while starting the car uses the same amount as idling for 6 seconds. Park your car and go into the restaurant rather than idling in the drive-through. Idling with the air conditioning on also uses extra fuel. Also, avoid going so fast that you have to brake for someone. Whenever you brake, you waste the gas it took to get going that fast.
2. Drive at a consistent speed. Avoid quick acceleration and hard braking. Cruise control will keep you at a constant speed, even when going up and down hills.
3. Avoid stops. If approaching a red light, see if you can slow down enough to avoid having to actually stop (because you reach the light after it is green). Speeding up from 5 or 10 miles per hour will be easier on the gas than starting from full stop.
4. Anticipate the stop signs and lights. Look far ahead; get to know your usual routes. You can let up on the gas earlier. Coasting to a stop will save the gasoline you would otherwise use maintaining your speed longer. If it just gets you to the end of a line of cars at a red light or a stop sign a few seconds later, it won't add any time to your trip. Ditto for coasting to lose speed before a highway off-ramp: if it means you catch up with that truck halfway around the curve instead of at the beginning, you haven't lost any time. In many cities, if you know the streets well, you can time the lights and maintain the appropriate speed to hit all green lights. Usually this is about 35 to 40 MPH.
5. Slow down. Air resistance goes up as the square of velocity. The power consumed to overcome that air resistance goes up as the cube of the velocity. Rolling resistance is the dominant force below about 40 mph. Above that, every mph costs you mileage. Go as slow as traffic and your schedule will allow. Drive under 60-65 since air grows exponentially denser, in the aerodynamic sense, the faster we drive. To be precise, the most efficient speed is your car's minimum speed in it's highest gear, since this provides the best "speed per RPM" ratio. This is usually about 45 to 55 miles per hour.
6. Use A/C only on the highway. At lower speeds, open the windows. This increased the drag and reduces fuel efficiency, but not as much as the AC at low speeds (35-40 mph). The air con - when used a lot - is known to use up about 8% of the fuel you put into your car.

on Jul 31, 2010 | Acura Integra Cars & Trucks

I have a vibration at 70 miles per hour

if the wheel alignment is faulty ( castor wobble ) at 70 mph there is no way that you can describe it as a vibration as it virtually rip the steering wheel out of your hands. If it is a torque converter problem then at around 3850-4025 rpm stationary there will be a vibration of the vehicle and engine The sort of vibration that you are experiencing at 70 mph will come from a drive line problem. If rear wheel drive then it could be faulty "U" joints, worn slip joint or failed rear engine mount
If front wheel drive it may be cv joints or bent drive shafts,wheel bearings or brake callipers not moving freely on the mounting bolts.

Dec 06, 2014 | 2001 Mercury Grand Marquis

Vibration when going about 40 to 50 miles per hour feels like whole underneath is vibrating

IF you have rear wheel drive then check the u-joints for wear/loose. Check slip joint for wear . Check rear engine mount is in good condition. Check wheel balancing

Nov 25, 2013 | 2006 Saturn Vue

2005 545i bmw sputtering at 40 miles per hour

So, here's what you have to do - it's a frikkin tranny reset!!

Drive in manual mode M5 for 5 minutes at over 60MPH, then switch it to M6 for 1 minute, then back to M5 for 2 minutes, then back to auto.
Note: the car is going to sputter continuously when you have it on M5 for the 5 minutes.

That was it - drove around for 30 minutes afterwards and no issues what so ever!! Unbelievable!!!

Sep 05, 2012 | BMW Cars & Trucks

I have a 66 mustang when i drive at 45 miles per hour, it makes a grinding noise and shakes. what can it be?

Could be a bad universal joint. I have a '65 Mustang, once when I installed the drive shaft, I put the rear u-joint into the axle slightly off-center. It would shake rather badly at about 45 MPH, but was mostly smooth above 50 or below 40. I thought it was a wheel balance problem, but it was just the driveshaft being slightly off-center.

Sep 20, 2010 | 1966 Ford Mustang

There is a wobble at about 35 miles an hour but drives out at about 40 miles per hour

Most low speed wobbles are caused by a tire becoming out of round as it wears down the tread. Probably a front tire. Jack the tire just till it is off the ground and turn the tire looking at the clearance of the tire above the ground. Notice how much it changes as you go around. Try this with each tire to find the problem.

Tread separation will also cause this. The above procedure will also work for this.

Jun 15, 2010 | 1986 Dodge Ram Wagon

Speedometer sticks / jumps

Yeah you may need a whole new dashboard because the whole panel circuit for may be messed up.

Aug 02, 2009 | 1998 Nissan Frontier

Recommended mph in 4 wheel drive

50 MPH in 4WD don't exceed you ll burn the transfer case clutches. (Safely stay at 40, why chance it.)

Low 4WD 25 MPH is the max, I recommend no more that 15MPH

Burnt clutches in transferr case 1200 job at the dealer, includes new clutch pack and fluid and 3 days of work, one or two days if you are lucky depending on their work load. (Read your manual)

Dec 22, 2008 | 2004 Ford F150

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