1996 Hyundai Elantra Overheating problem

SMA

MEMBER
1996 HYUNDAI ELANTRA
4 CYL
FWD
AUTOMATIC
204,000 MILES

Hi there, today when I was driving for about 30 mins, I found the blower blowing cool air instead of hot air, but I set temp to hot. At that time I also found the temp gauge was rising to H (red zone} The upper radiator hose was hot and the Lower hose was cool. I turned off ignition, wait for a minute, and started again, Temp gauge dropped gradually to normal and Hot air blowing again.
So I had the thermostate replaced. After that, same problem happened again occasionally. Anyone can help in this case.
thanks in advance.

4 Replies

JACOBANDNICKOLAS

MECHANIC
109,885 POSTS

Have you had the radiator flushed?

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Tuesday, March 24th, 2009 AT 11:33 AM

SMA

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The radiator had been replaced 4 months ago. (New radiator)

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Tuesday, March 24th, 2009 AT 7:03 PM

JACOBANDNICKOLAS

MECHANIC
109,885 POSTS

Have you had to add coolant to the system? Is the engine running well? If everything is new, I'm questioning a head gasket or water pump.

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Tuesday, March 24th, 2009 AT 8:33 PM

SMA

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9 POSTS

Yes. I refilled the coolant after I replaced the thermostate (New, but non OEM). No fluid or coolant leaking at all, So I suppose water pump & head gasket are OK. Engine runs very smooth. Some body told me there might be some air is trapped in the cooling system. Can you tell me how can I get rid of the air from the system, thanks

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Tuesday, March 24th, 2009 AT 9:26 PM