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Overheating problem cant solve

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Old 03-31-14, 08:49 AM   #1
Otmislife1
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Default Overheating problem cant solve

I have a 95 Lexus gs300 after driving for 30 to 40 mins it starts to overheating. I changed the rad cap, fan clutch, thermostate, and the radiator it's self. Mech said it's not the water pump. When I'm driving on the move temp starts to rise but it starts to go down when I come to a stop. Sometimes temp drops when I speed up also it's weird idk. If anyone know whts the problem help me out
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Old 03-31-14, 10:08 AM   #2
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There seems to be 2 things that come to mind. If you open the radiator cap, what color is the coolant? What color has the coolant always been? Red(dexcool) or green?

And which ever color it was, did the opposite color ever get poured into the radiator?
If so, then coagulation may very well have taken place, and the innards of your coolant system may be gummed up. See the links below.

http://mgaguru.com/mgtech/cooling/cool_121.htm

look at pics
http://www.bmw2002faq.com/topic/8014...ongested-head/


The other option is that it may be a bad head gasket, or small fissure in the block/head.
1) To check this you can let your car sit until the engine is completely cold.
2) Open the radiator cap and make sure the coolant/water level is toped off in the radiator.
3) Making sure the motor and coolant are completely cold, start the motor.
3) Then immediately open the radiator cap.
4) If the water/coolant gushes/bubbles out (not dribbles over the stem/neck that the radiator cap secures to) at idle or if you rev the engine(via throttle body is easiest) then there is a good chance the head gasket is bad or the block/head has a crack in it.



If it is any of these I am hoping for the first and not the latter.
Hope this helps
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Old 03-31-14, 11:35 AM   #3
Otmislife1
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Quote:
Originally Posted by kene View Post
There seems to be 2 things that come to mind. If you open the radiator cap, what color is the coolant? What color has the coolant always been? Red(dexcool) or green?

And which ever color it was, did the opposite color ever get poured into the radiator?
If so, then coagulation may very well have taken place, and the innards of your coolant system may be gummed up. See the links below.

http://mgaguru.com/mgtech/cooling/cool_121.htm

look at pics
http://www.bmw2002faq.com/topic/8014...ongested-head/


The other option is that it may be a bad head gasket, or small fissure in the block/head.
1) To check this you can let your car sit until the engine is completely cold.
2) Open the radiator cap and make sure the coolant/water level is toped off in the radiator.
3) Making sure the motor and coolant are completely cold, start the motor.
3) Then immediately open the radiator cap.
4) If the water/coolant gushes/bubbles out (not dribbles over the stem/neck that the radiator cap secures to) at idle or if you rev the engine(via throttle body is easiest) then there is a good chance the head gasket is bad or the block/head has a crack in it.



If it is any of these I am hoping for the first and not the latter.
Hope this helps
Thanks for your help I'm going to update you later
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Old 04-10-14, 10:47 PM   #4
blcknyelo
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Check fuses and "Rad. fan relay switch?"(green cap one I believe)
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Old 04-17-14, 10:33 PM   #5
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aside from all that stuff, make sure there is no air in the system. If the temp is going up and down, the system may need to be topped off.
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Old 04-23-14, 01:40 PM   #6
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Has there been any updates to this post?
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Old 04-27-14, 01:02 PM   #7
Otmislife1
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there was air in the radiator and a small leak coming from the heater core hose. Thanks guys
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Old 04-27-14, 01:02 PM
 
 
 
 
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