Why doesn't the heater work in my 2004 Elantra?

Asked by Jetman55 Dec 07, 2014 at 07:02 PM about the 2004 Hyundai Elantra GLS Sedan FWD

Question type: Maintenance & Repair

I recently replaced the thermostat and inlet elbow hose from the engine to the water
pump. The inlet hose to the radiator heats up, but the radiator outlet hose stays cool. The
engine temperature is normal, but with the radiator cap off, the antifreeze wants to spew
out. I have driven the car after servicing and refilled the radiator, but to no avail, the heater
still doesn't work. Could this be an air block, radiator problem, or a heater core problem?

4 Answers

103,085

Likely air is trapped in the system. Open the bleeder valve and refill.

4 people found this helpful.
40

I have a similar issue with Hyundai elantra 2003 gls, 140k. it was overheating so we replaced almost everything, from thermostat housing to thermostat, radiator, water pump, timing belt and head gasket. After doing all this stuff, the hot air stopped working which was working before the mechanic took apart everything. he said the front hose is getting hot the one from radaitor but the one from engine to air system is not getting hot, at this point he disconnected the ac cable. what should be wrong ?

4 people found this helpful.
20

Most likely you have a clogged or partially clogged heater core. While doing all that work to the coolant system some calcification deposits may have been dislodged and traveled to the heater core and created some kind of blockage!

1 people found this helpful.
295

Coolant level is low. Air trapped in heater core and hoses. Needs burped and more coolant added.

2 people found this helpful.

Your Answer:

Elantra

Looking for a Used Elantra in your area?

CarGurus has 3,192 nationwide Elantra listings starting at $1,850.

Postal Code:

CarGurus Experts

  • #1
    G. Jacob Durbin
    Reputation
    3,620
  • #2
    Taku Zhou
    Reputation
    3,090
  • #3
    Pirdman
    Reputation
    2,890
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Hyundai Sonata
39 Great Deals out of 1,036 listings starting at $3,499
Used Honda Civic
159 Great Deals out of 3,391 listings starting at $2,230
Used Toyota Corolla
120 Great Deals out of 1,950 listings starting at $1,995
Used Honda Accord
44 Great Deals out of 907 listings starting at $2,799
Used Toyota Camry
49 Great Deals out of 952 listings starting at $2,212
Used Nissan Altima
27 Great Deals out of 672 listings starting at $2,000
Used Nissan Sentra
67 Great Deals out of 1,830 listings starting at $2,495
Used Mazda MAZDA3
76 Great Deals out of 1,519 listings starting at $2,299
Used Hyundai Accent
31 Great Deals out of 389 listings starting at $2,499
Used Hyundai Tucson
82 Great Deals out of 2,174 listings starting at $1,591

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. Content will be removed if CarGurus becomes aware that it violates our policies.