Q: My 2005 Altima has 2 thermostats. I just replaced both of them about a week ago. Today my temp gauge keeps jumping from normal to

asked by on

As do most of these mid 2000s Altimas I ran into a problem with my heater not working. So I replaced the 2 thermostats, radiator, cap, and coolant. Burped the system till there was no more bubbles coming out. Still no heat, but I did notice a good amount of water pooling under. I'm guessing it's my heater core. But still not sure. Anyways, a week later and out of no where my temp gauge is going up and then dropping back down to normal then back up and back down and so forth. Why is it doing this? I have been driving it for a week with no issues until now.

My car has 180000 miles.
My car has an automatic transmission.

Hi Antonio. Thanks for sending in your question. I think your heater core is the reason why you’re having increased temperature issues. When the heater core gets clogged with debris (engine sludge usually) it restricts the flow of coolant throughout the system - and causes the heater to not work correctly. You should replace the heater core to resolve this issue.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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!
  1. Home
  2. Questions
  3. My 2005 Altima has 2 thermostats. I just replaced both of them about a week ago. Today my temp gauge keeps jumping from normal to

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: I have a 2007 Nissan Altima that won't crank. Some guy attempted to put a radio in and everything went South from there my radio w

Hi there. I'm sorry to hear this happened to you. Unfortunately, it's too common for inexperienced people to make mistakes like you've listed. The best way to resolve this issue is to have one of our professional mobile mechanics come...

Q: Hello, my car has no spark, no controlled ground for the fuel pump, and no injector pulse. Fuse link close to the battery and relays are good.

Hello and thank you for contacting YourMechanic. The ECU is under your passenger's side seat. You can gain access to it by simply sliding the seat all the way forward and removing the plastic cover from the ECU. You can...

Q: Ac motor blower

Running the fan on high should not cause any issues normally. However, in your case you may have a blower resistor that is shorted out and may overheat the wiring to the blower motor if it is run too long...

Related articles

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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...