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

23,175

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

1 out of 1 people think this is 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 out of 3 people think this is 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!

45

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

1 out of 1 people think this is helpful.

Your Answer

Add photo

Related Questions

Elantra

Looking for a Used Elantra in your area?

CarGurus has 51,353 nationwide Elantra listings starting at $1,699.

ZIP:

Search Hyundai Elantra Questions

Hyundai Elantra Experts

#1 pittgirl
pittgirl
Reputation 1,980
#2 Carrie Shelton
Carrie Shelton
Reputation 1,370
#3 tenspeed
tenspeed
Reputation 1,010
View All

Related Models For Sale

Used Hyundai Sonata
491 Great Deals out of 49,603 listings starting at $1,300
Used Honda Civic
488 Great Deals out of 80,458 listings starting at $558
Used Toyota Corolla
729 Great Deals out of 74,097 listings starting at $1,790
Used Honda Accord
703 Great Deals out of 81,926 listings starting at $500
Used Toyota Camry
836 Great Deals out of 90,858 listings starting at $1,300
Used Hyundai Accent
159 Great Deals out of 12,590 listings starting at $1,300
Used Nissan Altima
776 Great Deals out of 76,998 listings starting at $470
Used Kia Optima
380 Great Deals out of 29,499 listings starting at $1,700
Used Ford Focus
527 Great Deals out of 55,030 listings starting at $1,495
Used Mazda MAZDA3
203 Great Deals out of 29,255 listings starting at $1,495
Used Nissan Sentra
457 Great Deals out of 53,204 listings starting at $2,000

Used Cars For Sale

2014 Hyundai Elantra GLS For Sale
30 listings starting at $9,895
2013 Hyundai Elantra GLS For Sale
84 Great Deals out of 2,500 listings starting at $5,495