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Cooling Systems -- Problems & Solutions (Radiator, Fan, etc)

629 messages,  Last post on Mar 23, 2013 at 11:17 PM

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What is this discussion about? Engine

Messages Page 60 of 64

#584 of 629 Re: BIG HEADACHE!! [imidazol97] by rickysmyboy

Apr 06, 2010 (7:39 am)

Replying to: imidazol97 (Apr 06, 2010 7:33 am)
OK You have helped alot. Just 2 questions, How hard is it to change head gasket?
How can you test the lower hose for integraty?
 
Very thankful for your input

#585 of 629 Re: BIG HEADACHE!! [rickysmyboy] by imidazol97

Apr 06, 2010 (7:57 am)

Replying to: rickysmyboy (Apr 06, 2010 7:39 am)
Feeling the hose is one technique. If uncertain, taking it off and looking at interior is best. By then it's cheap just to go ahead and replace it.
 
Does it overheat driving at speed along the highway or roads? Overheat sitting idling?
 
Head gasket requires careful diagnosis and checking pressure inside cylinder with compression tester to see if a particular cylinder doesn't maintain as high pressure as next one. It requires removing the intake manifold, valve covers, and then the head bolts. Head needs to be inspected for cracks, etc., that might cause leaking.

#586 of 629 Re: BIG HEADACHE!! [imidazol97] by rickysmyboy

Apr 06, 2010 (8:16 am)

Replying to: imidazol97 (Apr 06, 2010 7:57 am)
Just went out and started truck for 2 minutes, let it get to operating range, no change in resistance on fan but let it run idle, not highway. It heats up at highway speeds, not on idle. Felt top and bottom hoses, top felt hot and bottom did not.
Suggestions on the "Cheaper" way to check for sure?

#587 of 629 Re: BIG HEADACHE!! [rickysmyboy] by Mr_Shiftright HOST

Apr 06, 2010 (9:45 am)

Replying to: rickysmyboy (Apr 06, 2010 8:16 am)
Okay, if it heats up at speed but not at idle you have a coolant circulation problem, not an air circulation problem.
 
By the way, a chemical flush of the radiator is a pretty lame procedure---you could still have a clogged radiator.

#588 of 629 Re: BIG HEADACHE!! [rickysmyboy] by imidazol97

Apr 06, 2010 (10:00 am)

Replying to: rickysmyboy (Apr 06, 2010 8:16 am)
Agree with shiftright. Now that you've said it's an overheat at higher speeds, it's back to the radiator and or lower radiator hose.
 
The cheapest is to take the radiator out yourself and take it to shop for proper cleaning.

#589 of 629 Re: BIG HEADACHE!! [Mr_Shiftright] by rickysmyboy

Apr 06, 2010 (10:03 am)

Replying to: Mr_Shiftright (Apr 06, 2010 9:45 am)
just ran it at speed for a few minutes (Actually went on highway for a few miles) The gauge never mooved but after coming back, I felt no resistance change in the fan, is that a correct way to see if the fan clutch is bad or going bad?
 
Any idea whats the best way to make sure radiator is not plugged? (No more LAME testings)
Thanks for your input.

#590 of 629 Re: BIG HEADACHE!! [rickysmyboy] by Mr_Shiftright HOST

Apr 06, 2010 (10:12 am)

Replying to: rickysmyboy (Apr 06, 2010 10:03 am)
You'd have to pull it out and have it flow-tested.
 
Again, if you have high speed overheat, this is probably not a fan problem (air problem).

#592 of 629 Solve This One by oldfarmer50

May 29, 2010 (5:07 pm)

Ok let's see how smart you guys are.
 
1984 Corvette 5.7L with 100+K miles runs hot at lower speeds. Gets up to a 235 temp before radiator fan kicks on and cools things off. Runs normal at highway speeds.
 
Am I looking at a sticking thermostat or a defective fan switch or something major?

#593 of 629 Re: Solve This One [oldfarmer50] by Mr_Shiftright HOST

May 29, 2010 (6:17 pm)

Replying to: oldfarmer50 (May 29, 2010 5:07 pm)
If you overheat at lower speeds but not at higher speeds, you have an AIR circulation problem, not a coolant circulation problem.

Messages Page 60 of 64

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