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

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

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

32,575

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

1 of 1 people found this helpful.
30

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 ?

3 of 3 people found this helpful.
10

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!

105

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

1 of 1 people found this helpful.

Your Answer

Elantra

Looking for a Used Elantra in your area?

CarGurus has 46,176 nationwide Elantra listings starting at $495.

ZIP:

Hyundai Elantra Experts

  • #1
    pittgirl
    Reputation
    2,070
  • #2
    Carrie Shelton
    Reputation
    1,430
  • #3
    Pirdman
    Reputation
    1,240
View All

Related Models For Sale

Used Hyundai Sonata
607 Great Deals out of 53,975 listings starting at $1,500
Used Honda Civic
573 Great Deals out of 52,762 listings starting at $1,500
Used Toyota Corolla
888 Great Deals out of 69,845 listings starting at $1,479
Used Honda Accord
838 Great Deals out of 87,589 listings starting at $1,444
Used Toyota Camry
1,072 Great Deals out of 76,710 listings starting at $1,100
Used Hyundai Accent
276 Great Deals out of 12,046 listings starting at $1,500
Used Nissan Altima
1,145 Great Deals out of 74,685 listings starting at $900
Used Kia Optima
514 Great Deals out of 31,818 listings starting at $2,450
Used Mazda MAZDA3
258 Great Deals out of 27,113 listings starting at $1,700
Used Ford Focus
596 Great Deals out of 69,061 listings starting at $1,750
Used Nissan Sentra
644 Great Deals out of 53,168 listings starting at $1,150

Used Cars For Sale

2014 Hyundai Elantra GLS For Sale
44 listings starting at $8,420

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.