Elantra heater blows cold air when stopped
#1
12-03-2008 | 02:30 PM
Thread Starter
Joined: Dec 2008
Posts: 1
Elantra heater blows cold air when stopped
My '04 Elantra's heater will blow cold air when the car is stopped but when I'm accelerating, it will blow hot air. After my car has been running for awhile, the heater will blow hot air even when stopped. We noticed buildup right under the radiator hose going into the engine so we replaced the radiator hose thinking there was a leak but the problem still exists. Any suggestions/ideas?
#2
12-03-2008 | 03:08 PM
Senior Member
Joined: Jul 2007
Posts: 144
RE: Elantra heater blows cold air when stopped
Probably the thermostat, some cars do that,,and some cars blow hot air when stopped and cold when driving. depends on if it failed in the open or closed position. Its a cheap fix and probably a good idea,,,although it being an 04, it really shouldn't have failed yet,,but just because it shouldn't have,,dosn't mean they don't. Give that shot and let us know. Good luck
#3
12-03-2008 | 03:32 PM
Senior Member
Joined: Jan 2008
Posts: 1,288
From: USA-Montana
RE: Elantra heater blows cold air when stopped
My '04 Elantra's heater will blow cold air when the car is stopped but when I'm accelerating, it will blow hot air. After my car has been running for awhile, the heater will blow hot air even when stopped. We noticed buildup right under the radiator hose going into the engine so we replaced the radiator hose thinking there was a leak but the problem still exists. Any suggestions/ideas?
#4
12-04-2008 | 10:28 AM
Junior Member
Joined: Nov 2008
Posts: 22
From:
RE: Elantra heater blows cold air when stopped
ORIGINAL: ken99
Check the coolant level in the radiator when the engine is cold. I think you will find it is low. The level is just low enough for poor circulation at idle, but does have some circulation to the heater core at higher rpms. This sometimes happen if you replace a hose, but don't get all the air out of the block cavity and heater core when you refill the system. You may also have a water pump wearing out. I'd certainly check for signs of coolant starting to leak through the pump's weep hole.
My '04 Elantra's heater will blow cold air when the car is stopped but when I'm accelerating, it will blow hot air. After my car has been running for awhile, the heater will blow hot air even when stopped. We noticed buildup right under the radiator hose going into the engine so we replaced the radiator hose thinking there was a leak but the problem still exists. Any suggestions/ideas?
#5
12-18-2008 | 12:08 AM
Joined: Dec 2008
Posts: 1
RE: Elantra heater blows cold air when stopped
I had this SAME EXACT problem. I was low on coolant, so I decided to just flush my radiator out, and start new. My heater works just fine now. Its a nightmare when you start your car to defrost the windows and you come out to leave and see no progress!
Thread
Thread Starter
Forum
Replies
Last Post
ElantraOwners
Hyundai Elantra
3
01-24-2011 09:07 PM
sloturbo
Hyundai Santa Fe
0
12-27-2010 04:21 PM
