Skip the auto shop - Our mechanics make house calls

Q: The heat isn't working in my 1995 GMC

asked by on

I changed heater core thermostat blend door actuators but heat still not working. Could it be water pump or radiator? Also radiator car. After letting run reaching normal temp the hose hot but soft. The ones going to heater core are cool

My car has 143000 miles.
My car has an automatic transmission.

Hi there. The symptoms you’re describing (especially the soft radiator hose) along with the fact your heater is not working may be caused by restrictions in the coolant line such as an air bubble. This could have happened when you replaced the heater core thermostat, especially if you didn’t flush the coolant from the radiator during this service. However, it could be a problem with the water pump, so it’s a good idea to have a professional mechanic, such as one from YourMechanic, complete a heater is not working inspection, so they can pinpoint the exact source of your GMC’s issues.

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・Fair and transparent pricing

Get a quote

What others are asking

Q: My car starts but only runs for 3 seconds before it shuts down

Hello - Is your Check Engine Light on? If so, you can check the trouble codes yourself to diagnose the problem, or you can have a mobile technician, such as one from YourMechanic, come by at your convenience and diagnose...

Q: Rattling noise AC heater

Hey there, thanks for writing in about your 2010 Lexus HS250h. Even though you said the blower motor looks okay, my guess is that it probably has a bad bearing, which is causing the noise. The only other thing I...

Q: Car squeaking when driving

Hello. I will assume your vehicle is equipped with a manual transmission as it sounds like you are shifting gears yourself. The symptoms you've given are leading me to a malfunction in your clutch assembly, or engine and transmission...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...