Q: Heat only works when accelerating

asked by on October 17, 2016

The heat only works when accelerating had a coolant flush thinking that would help it did not . They did bleed it the right way twice the heat works for about 20 mins then goes back to only when giving gas . I changed out the thermostat for a different reason but the problem was still accruing also had the radiatior changed then had it bleed about 6 months ago now it's cold had it bleed twice and still having the same issue

My car has 129000 miles.
My car has an automatic transmission.

Heater is not working Inspection $79.99 - $89.99 Get a Quote

Hello. I suspect the heater control valve is the culprit here. Most likely only opening partially. By only being partially open, it allows more hot water to circulate when the engine load and RPM are higher, as when you accelerate, but not enough otherwise. Another possibility it that the heater control mechanism (most are electric these days) is not signaling the air blend doors. The circulating air controls which "mix" cool and hot air before it comes out of the vents - resulting in too little hot air coming out of the heater ducts. If you would like to have this taken care of, I recommend having a certified professional from YourMechanic come to your car’s location to inspect the heater system and proceed with any needed repairs.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

What others are asking

Car won't go forward when it's on Drive.

Hello, the concern you have I strongly advise not to drive. The issue needs to be addressed, the vehicle will become inoperable. The automatic transmission has 3 systems; electronic, hydraulic, and mechanical. What describe could be an internal mechanical...

No power unless key is turned to on position

Hello, and thank you for writing in. This can happen when the battery is low, or has died recently. Although the fuses are good, make sure they are clean and have a solid connection. If these steps do not help,...

Heater not working

Your vehicle has a control valve in the heater hoses the either blocks or allows the hot coolant to flow into the heating system. This control valve is operated by engine vacuum via several solenoids that are controlled by the...

Coolant leaking and overheating, car also shut off on me.. could it be my water pump?

The coolant leak could be coming from the water pump weep hole (indicates that the seal is bad), a coolant hose that is split or loose on the clamps, a split radiator, or the radiator could be plugged up causing...

Red light showing a car with a lock is on?

Hi, thanks for writing in. I'd be happy to help. This is your car immobilizer light that indicates the car is armed. The immobilizer, usually called Securi-Lock in Ford vehicles, is a passive anti-theft device that disables your vehicle’s ability...

My car is making a knocking noise - 2003 Toyota Corolla

Hi there. From the description you have provided, the knocking noise in your engine is serious. The engine oil light coming on while driving down the highway, then quit running is equally concerning. Assuming you have had the engine's oil...

Morse code beeps coming from Nissan Quest 2005

Hello. An electronic chime from your vehicle may signify that the computer has detected low pressure at one of the vehicle's tires. Your vehicle is equipped with a tire pressure monitoring (TPMS) system that will notify you if one or...

Cigarette lighter adapter not working.

Hi! The cigarette lighter is on a fused circuit connected to the battery. The wiring for the socket uses thin wires on a low amperage circuit. Generally, too many devices hooked into the socket, or just one drawing more power...

How do you remove the gas cap?

Without removing the gas cap, you won’t be able to fill your tank. Nissan makes it easy to remove and replace your cap, and even provides a handy holder for the cap during the filling process. Here’s what you need...

Related articles

A Buyer's Guide to the 2012 Nissan Quest
If If your family has gotten to the size where a minivan makes sense, you have a huge market to explore. Start with the 2012 Nissan Quest, though, and you may find that your search becomes a relatively short one....
A Buyer’s Guide to the 2012 Nissan Sentra
The The 2012 Nissan Sentra is one of the most versatile sedans in its class. Because it has such a wide variety of options available in its four trims, buyers can choose between a bare-bones version at a very affordable...
What Components of the Heating and AC System Are Most Likely to Fail?
The The average automotive heating and cooling system (HVAC) is actually very complex, and they’re not connected to one another outside the cabin. Yes, your HVAC controls allow you to switch from warm air to cold, adjust the fan speed...