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Why Does My Car Heater Only Work When I Rev The Engine?
11/23/2020 5:28:00 PM
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(5268) View Count
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One of the questions that we often come across is our customers asking about only getting heat when they rev up the
engine
. It's a troublesome issue and takes a thorough process to get to the root cause. Most of the time, it's with a car that has high mileage; however, that does not mean it can't happen to a newer car as well.
About Your Car Heating System
Before we discuss the possible reasons why a car heater might only work when the engine is revved, it's important to understand how the heating system works. Your heating system has several major components that work in tandem with the engine's cooling system. They include the heater core, blower motor, heater hoses, ventilation outlets, and the air conditioning control panel. Other important components that you may be more familiar with include the thermostat, radiator, water pump, and
coolant
. If either of those components malfunction, it can wreak havoc on the entire heating system.
Once your engine reaches the ideal operating temperature, the thermostat opens, which allows the coolant to circulate through the cooling system and the heater core, and then subsequently back to the radiator. You control the amount of heat that is allowed from the blower motor, which has an inlet and an outlet. While this is happening, the heater control valve regulates the amount of heat allowed and helps to prevent the cabin from getting too hot. If this sounds complicated, it's because it is. And it takes a well-trained technician to diagnose why the car heat stops when idling.
Reasons Why Your Car Heater Only Works When You Rev The Engine
After a considerable amount of time, such as when you're warming up your car in the morning, the heater will reach its peak temperature. That is perfectly normal. However, if the heater only warms up when you rev the engine, that is a sign a component is amiss. One of which is the heater core. Although the thermostat greatly affects the engine temperature, typically, the engine will overheat if it's deficient. But when the heater core is the culprit, it's usually
clogged and prevents the inner walls of the core from reaching a high temperature and may eventually cause a good amount of coolant to show on the cabin floor. While a heater core can be flushed, once a cabin floor leak occurs, the only choice is a replacement.
Other reasons why the car heat stops when idling include:
Blower Fan Not Pushing Enough Air
Lack of Coolant Circulating
Coolant is Leaking
Why Proper Maintenance is Important
If you want to reduce the likelihood that your car heat will stop when idling, then adhere to proper maintenance recommendations. They are provided for good reason and will not only ensure that your car remains in the best possible condition, but they actually save you money in the long run. Often, drivers will prolong maintenance recommendations and end up paying more money due to unnecessary repairs.
Tips for staying current on proper maintenance:
Schedule appointments as far in advance as possible
Use our
Drop N' Go
option
When appropriate, schedule more than one maintenance appointment at a time
Set appointment reminders on your smartphone weeks or days ahead
With the help of United Tire & Service and 13 independent locations, you can avoid costly situations altogether by staying current. Call your local United Tire location or
schedule your appointment online
.
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1/15/2021
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United Tire & Service
15 Evergreen Dr,
Concordville, PA 19331
Phone:
610-859-4416
Fax:
19331
39.88292,-75.52377
United Tire & Service
637 West Bridge St,
Phoenixville, PA 19460
Phone:
(610) 634-8399
Fax:
19460
40.12979,-75.52659
United Tire & Service
1140 Easton Rd,
Willow Grove, PA 19090
Phone:
(267) 662-2033
Fax:
19090
40.15891,-75.12309
United Tire & Service
87 E Lancaster Ave,
Paoli, PA 19301
Phone:
(610) 723-7664
Fax:
19301
40.04239,-75.47919
United Tire & Service
340 Street Rd,
Southampton, PA 18966
Phone:
(267) 223-7298
Fax:
18966
40.17837,-75.0511
United Tire & Service
224 E Street Rd,
Feasterville, PA 19053
Phone:
(267) 662-2239
Fax:
19053
40.14797,-74.99648
United Tire & Service
4094 Chestnut Street,
Emmaus, PA 18049
Phone:
(610) 967-5625
Fax:
18049
40.51937,-75.52203
United Tire & Service
614 Westtown Rd,
West Chester, PA 19382
Phone:
(610) 590-8479
Fax:
19382
39.95898,-75.58625
United Tire & Service
980 E Lancaster Ave,
Downingtown, PA 19335
Phone:
(610) 590-9116
Fax:
19335
40.01662,-75.68335
United Tire & Service
100 Robbins Rd,
Downingtown, PA 19335
Phone:
(610) 590-8493
Fax:
19335
39.99897,-75.70103
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