1996 Hyundai Elantra Overheating problem

1996 HYUNDAI ELANTRA
204,000 MILES • 4 CYL • FWD • AUTOMATIC
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SMA
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  • 9 POSTS
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.
Mar 23, 2009 at 2:26 PM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
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Have you had the radiator flushed?
Mar 24, 2009 at 4:33 AM
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SMA
  • MEMBER
  • 9 POSTS
The radiator had been replaced 4 months ago. (new radiator)
Mar 24, 2009 at 12:03 PM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,248 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.
Mar 24, 2009 at 1:33 PM
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SMA
  • MEMBER
  • 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
Mar 24, 2009 at 2:26 PM
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