Skip the auto shop - Our mechanics make house calls

Q: Heater temperature does not come up when you raise the temp.

asked by on

When it is. 40 degrees out and you raise the temp. To 70 I still get cold air. The engine temp. Is ok

My car has 100000 miles.
My car has an automatic transmission.

A: Hi there. It sounds like a servo for the te...

Hi there. It sounds like a servo for the temperature control has failed. If the coolant level is full and the engine is reaching operating temperature, then there should be heat available. Make sure that the vents are not set for fresh air as 40 degree air takes a slight bit longer to warm than current cabin air. The cause of the servo being inoperative could be a failed servo, wiring harness, or controller. Checking these will require some disassembly of the instrument panel, a digital volt/ohm meter, and possibly a scan tool with air conditioner controls capabilities to monitor data values. I strongly suggest that you have a qualified technician perform an inspection to avoid replacing unnecessary parts. Your Mechanic has several available technicians that can assist you with a car has no heat inspection.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Slight knocking while driving

If your car has been leaking oil for an extended period and you hear knocking, it's possible that an engine bearing has either spun, or is about to spin in its bore. After fixing the oil leak, I would recommend...

Q: When I accelerate, loud ticking noise at low rpm, car jerks and stutters. It goes away at higher rpms.

The misfiring could be ignition or fuel related. If the plugs have not been replaced, on the timetable set forth in the maintenance schedule, that is certainly one possibly. Also, the plug wires could be tested. Diagnostic Trouble codes that...

Q: #1 speak plug continues to blow out

When a spark plug burns out it is not enough to go off of unless a spark plug that went bad was looked at. A plug may go bad from running too lean from a injector that's partially blocked for...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...