My heater blows cold air and the engine temp gauge went all the way to the top then quickly down when I turned the heater off. What could it be?

30

Asked by Dec 09, 2013 at 09:52 AM about the 2005 Honda Civic EX

Question type: Maintenance & Repair

Per the boards, I topped off coolant and drove it around yesterday with no problem but this
morning it did the same thing - blew cold air out the vent and the temp gauge went all the
way up then to regular level when I turned the heater off.  It's 4 degrees out so I need the
heat!

3 Answers

175

I had the same issue with my Acura Integra (very similar to the Civic) which came from a hose that was leaking, which caused an air bubble to form in the system. The temp gauge registered "all the way hot" because it was in air, and not in fluid, so it didn't know what to do. I would guess that it's likely you are also leaking coolant and have an air bubble in the system or your heater core is clogged up. I had another similar problem in another older car, and it ended up being coolant that didn't have enough anti-freeze to keep the system from freezing up. I had a vehicle that was running and producing heat, but I had an ice clog in the hoses coming into the heater core. I'm guessing in your situation though that you're leaking/loosing coolant somewhere and that's causing an air bubble. Keep the coolant topped off and get it to a reputable mechanic for them to check out. You're not the only one with this issue with the cold weather :)

6 of 6 people found this helpful.
30

The mechanic can't recreate the problem. I had already checked the coolant and had added some. He added some too. We'll see what happens last time I said there was something wrong with my car, he wouldn't believe me until after the drive test when he heard the noise I had reported. Thanks for your answer Woolley. I think it was an air bubble.

3 of 3 people found this helpful.

Thank goodness a response that actually makes sense. I've been checking the internet for this problem and people posted some different trial-and-error solutions. I have an '04 civic and it has always acted up like that during cold weather 'ESPECIALLY' winter. I decided one day to just fill up the coolant and that actually worked for a while - worked in a sense that the gauge doesn't go MAX. But it still pumped out cold air. Now, I get it why whenever I open the hood there is a leak of liquid - likely the coolant! Your answer makes sense, thanks! I will have this checked up soon!

Your Answer

Civic

Looking for a Used Civic in your area?

CarGurus has 69,330 nationwide Civic listings starting at $1,499.

ZIP:

Honda Civic Experts

  • #1
    Tom Demyan
    Reputation
    1,100
  • #2
    Takoda Fraser
    Reputation
    1,030
  • #3
    Jonathan Ford
    Reputation
    1,010
View All

Related Models For Sale

Used Honda Accord
1,020 Great Deals out of 56,655 listings starting at $899
Used Toyota Corolla
754 Great Deals out of 53,215 listings starting at $1,502
Used Honda Civic Coupe
179 Great Deals out of 13,477 listings starting at $1,695
Used Toyota Camry
916 Great Deals out of 79,531 listings starting at $750
Used Honda CR-V
751 Great Deals out of 55,346 listings starting at $1,750
Used Nissan Altima
949 Great Deals out of 77,032 listings starting at $1,000
Used Mazda MAZDA3
350 Great Deals out of 25,889 listings starting at $950
Used Hyundai Elantra
453 Great Deals out of 45,804 listings starting at $1,300
Used Ford Focus
785 Great Deals out of 54,693 listings starting at $1,895
Used Honda Accord Coupe
148 Great Deals out of 8,287 listings starting at $1,450
Used BMW 3 Series
1,035 Great Deals out of 32,841 listings starting at $999
Used Ford Mustang
592 Great Deals out of 36,158 listings starting at $1,800
Used Hyundai Sonata
715 Great Deals out of 49,914 listings starting at $500

Used Cars For Sale

2017 Honda Civic EX For Sale
7 Great Deals out of 11,237 listings starting at $17,194
2016 Honda Civic EX For Sale
17 Great Deals out of 438 listings starting at $12,999
2015 Honda Civic EX For Sale
34 Great Deals out of 830 listings starting at $10,791
2014 Honda Civic EX For Sale
35 Great Deals out of 1,239 listings starting at $9,984
2013 Honda Civic EX For Sale
15 Great Deals out of 358 listings starting at $6,900

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.