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Overheating

Tiny
VETTE2112
  • MEMBER
  • 1989 OLDSMOBILE TORONADO
  • 110,000 MILES
New radiator new hose new heater core systm flushed it will run bt 20mins then the temp gauge shows 240 top half of the radiator is warm bottom half cold what can it be
Thursday, February 16th, 2012 AT 3:29 AM

17 Replies

Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,004 POSTS
MOST COMMON DEAL MIGHT BE THE THERMOSTAT NOT OPENING AND NEEDS TO BE REPLACED.

ANOTHER POSSIBILITY IS THAT MAYBE THE RADIATOR HOSE (USUALLY THE BOTTOM ONE) IS SQUISHY AND SUCKING FLAT, WITH THE SUCTION GENERATED BY THE WATER PUMP. USED TO, MOST ALL RADIATOR HOSES HAD A ANTI-COLLAPSE SPRING IN THEM--NOW A DAYS, I TRANSFER MY OLD SPRING INTO THE HOSE, IF IT DOESN'T COME WITH ONE.

IN EITHER CASE, THE WATER CANNOT CIRCULATE AS IT SHOULD, AND THE COOLANT INSIDE THE ENGINE IS WHAT GETS TOO HOT. THIS MIGHT ACCOUNT FOR THE "NOT SO HOT" RADIATOR

LET US KNOW HOW IT'S GOING

THE MEDIC
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Thursday, February 16th, 2012 AT 3:43 AM
Tiny
VETTE2112
  • MEMBER
  • 54 POSTS
It also has a new thermastat in it and the hose is fine
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Thursday, February 16th, 2012 AT 4:44 AM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
It's normal for the radiator to cool at the lower part. Does it overheat? Might just be a bad defending unit. Or inaccurate gauge.
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Thursday, February 16th, 2012 AT 9:38 AM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
That's sending unit.
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Thursday, February 16th, 2012 AT 9:40 AM
Tiny
VETTE2112
  • MEMBER
  • 54 POSTS
Its not the sending unit its fine after bt 20mins I loosen the cap and coolant trys to come out everything is new from the pump. Heater core, thermast, hoses, system flushed, new radiator
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Friday, February 17th, 2012 AT 4:45 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Try this. With the engine cold, open the radiator cap and start the engine. Does coolant shoot out?
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Friday, February 17th, 2012 AT 4:51 AM
Tiny
VETTE2112
  • MEMBER
  • 54 POSTS
No
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Friday, February 17th, 2012 AT 4:59 AM
Tiny
VETTE2112
  • MEMBER
  • 54 POSTS
Only after bout 20-30 mins if that thn it does
and it blows straight cold air
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Friday, February 17th, 2012 AT 5:00 AM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
This motor is 30 years old now and internal blockage may exist. Also any car will spill coolant coolant if opened hot. Also your thermostat may be defective even though it's new. Eater pump games may have dissolved, removethe thermostat start car, does coolant circu cilatelate?
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Friday, February 17th, 2012 AT 9:40 AM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Damned phone changes spelling at will, thats the water pump vanes may have dissolved and not enough is being pumped through the system. Feel both water hoses to the heater core with a warmed up motor. Are they both HOT? If only one is hot, the core is clogged and needs either replacing or if your real lucky, a backflush with high pressure. If both are cold, either the thermostat isnt opening, or the pump is no good, or there is an internal blockage in the engine block.
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Monday, February 20th, 2012 AT 11:45 PM
Tiny
VETTE2112
  • MEMBER
  • 54 POSTS
The whole system has been flushed it also has a new heatercore the waterpump is 5months old new radiator, new hoses, thermastat
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Monday, February 20th, 2012 AT 11:50 PM
Tiny
VETTE2112
  • MEMBER
  • 54 POSTS
Im still tryn to figure out my subrn its drvin me nutts too
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Monday, February 20th, 2012 AT 11:52 PM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Flushed engine block will not clear out internal blockages, only dismantle and boiling in a tank will do it, but you have not answerd if it actually overheats? Dont remove the cap, drive it for a while sit in traffic, then drive over 35 mph. If it overheats in traffic, you need a cooling fan.
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Tuesday, February 21st, 2012 AT 8:36 AM
Tiny
VETTE2112
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  • 54 POSTS
Both fans cme on after abt 20mins
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Tuesday, February 21st, 2012 AT 3:57 PM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
You are still not answering my original question, the fans should come on when the temp at the sensor get to 225 degrees, if this is correct, then you dont have an overheat problem, you have a gauge or sender problem. Rent an infrared thermometer and measure this please.
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Tuesday, February 21st, 2012 AT 11:55 PM
Tiny
VETTE2112
  • MEMBER
  • 54 POSTS
They come on bt 200 I cant even drive it to the store without it gettin hot
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Wednesday, February 22nd, 2012 AT 12:03 AM
Tiny
VETTE2112
  • MEMBER
  • 54 POSTS
I changed the transmission pan gasket and nw it wont shift it has been running fine til I changed tht also found out the waterpump was the problem wit it overheating nw I cant figure out y it wnt shift
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Sunday, March 11th, 2012 AT 3:30 AM

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