Possible Overheating - Chevelle Tech
Heating & Cooling Heating, cooling and air conditioning

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post #1 of 49 (permalink) Old May 15th, 20, 7:36 PM Thread Starter
Kevin
 
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Location: Baton Rouge, LA
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Hey everyone, new to the Chevelle community and this site. I purchased a 1969 Chevelle SS 396 with a 454 engine recently so I am trying to get caught up. The car has been great and fun to drive around town but I am unsure whether I have an overheating issue or not. I am in Louisiana and the temperature has been in the 80s pretty much all day, every day. The real reason I'm here—when driving the temp creeps up to 200 and stays around there until I stop, or move slowly, then it will get around 220-225. Once I start moving down the highway or road, the temperature will go back to around 200.

I have a fan shroud, new mechanical fan, no AC, and the temperature sender is screwed into the heads (suspect it's higher than actual). I plan to move the temp sender cable to the thermostat housing Sunday. I read somewhere (here maybe?) that the temperature sender should not be wrapped in Teflon or pipe dope, is that true because mine currently is?

The real question is my Chevelle running too hot? If so, what are some things that I can look into? I have a 180 degree high flow thermostat coming in tomorrow, so I plan to change that then.

If y'all need anymore information I can provide it. Thanks in advance.
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post #2 of 49 (permalink) Old May 15th, 20, 8:07 PM
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Rame
 
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Re: Possible Overheating

Probably just a wrong reading. Are you having vapor lock issues? Loosing coolant?

.
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post #3 of 49 (permalink) Old May 15th, 20, 9:27 PM Thread Starter
Kevin
 
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Quote:
Originally Posted by sampoerna415 View Post
Probably just a wrong reading. Are you having vapor lock issues? Loosing coolant?
I have an ethanol-free gas station down the street that I am also going to start using when I finish up this tank of gas. I do believe, from my research, that if there were any vapor lock issues, this would alleviate that.
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post #4 of 49 (permalink) Old May 15th, 20, 9:38 PM
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Rick
 
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Re: Possible Overheating

Welcome to the group - I'm in Bossier City. That 220 F temperature is not too hot and you want it about that warm to boil unburned fuel and water condensation out of the engine oil. I'm at about the same, maybe 215, on my LS engine.

Rick

1970 El Camino under Reconstruction - 5.3L LS VORTEC Engine and 4L60E Transmission
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post #5 of 49 (permalink) Old May 15th, 20, 11:01 PM
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Eric
 
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Re: Possible Overheating

Lean carburetor, retarded ignition timing, or poor air flow through your radiator will cause your issue. 220 is too hot for a 454.
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post #6 of 49 (permalink) Old May 16th, 20, 9:03 AM
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Lew
 
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Re: Possible Overheating

What radiator is in there now stock and how old is it. Maybe you ought to look at a heavier duty radiator though sounds like it may be a low speed air flow issue but if the radiator is old an clogged does not help. I am not familiar with 1969 SS ones did they have a regular and an HD AC car radiator like the earlier years. On the fan what kind of mechanical fan is it a flex fan or a GM 7 blade HD monster fan? Basically the later year Chevelles 1968-1972 have much larger radiators and have better cooling options than us early year guys.
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post #7 of 49 (permalink) Old May 16th, 20, 9:57 AM Thread Starter
Kevin
 
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Quote:
Originally Posted by Lew540 View Post
What radiator is in there now stock and how old is it. Maybe you ought to look at a heavier duty radiator though sounds like it may be a low speed air flow issue but if the radiator is old an clogged does not help. I am not familiar with 1969 SS ones did they have a regular and an HD AC car radiator like the earlier years. On the fan what kind of mechanical fan is it a flex fan or a GM 7 blade HD monster fan? Basically the later year Chevelles 1968-1972 have much larger radiators and have better cooling options than us early year guys.
Thanks for the reply. I purchased the car in its current state which has been restored. Most of the parts look fairly new, but I am unsure on the specifics. I have attached a photo of the fan and part of the radiator.
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post #8 of 49 (permalink) Old May 16th, 20, 10:04 AM
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Henry
 
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Re: Possible Overheating

Radiator looks a tad small to me.
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post #9 of 49 (permalink) Old May 16th, 20, 10:58 AM Thread Starter
Kevin
 
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Originally Posted by 72 SS 555 FI View Post
Radiator looks a tad small to me.
Measured just now and it's 2.5". If that's rather small, what is a good recommendation?
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post #10 of 49 (permalink) Old May 16th, 20, 11:53 AM
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Eric
 
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Re: Possible Overheating

The fan is too far into the shroud. I like the flexalite staggered 7 blade flex fan, diameter based on your shroud opening.
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post #11 of 49 (permalink) Old May 16th, 20, 3:45 PM Thread Starter
Kevin
 
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Originally Posted by oldcutlass View Post
The fan is too far into the shroud. I like the flexalite staggered 7 blade flex fan, diameter based on your shroud opening.
Here is a better picture of the fan and shroud. If you think it needs to be staggered more, by how much?
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post #12 of 49 (permalink) Old May 16th, 20, 4:13 PM
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Eric
 
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Re: Possible Overheating

The fan needs to be positioned 1/2 in and 1/2 out of the shroud. You need a shorter spacer. When I was talking about staggered, I meant unevenly spaced fan blades like the Flex-a-lite 1818 flex fan.
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post #13 of 49 (permalink) Old May 16th, 20, 4:43 PM Thread Starter
Kevin
 
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Quote:
Originally Posted by oldcutlass View Post
The fan needs to be positioned 1/2 in and 1/2 out of the shroud. You need a shorter spacer. When I was talking about staggered, I meant unevenly spaced fan blades like the Flex-a-lite 1818 flex fan.
That makes sense. Thanks for the information, I am going to get a shorter spacer and make that adjustment, as well as probably replace the fan with the flex-a-lite.
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post #14 of 49 (permalink) Old May 16th, 20, 4:52 PM
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Eric
 
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Re: Possible Overheating

Before you start replacing parts, troubleshoot. Note, before replacing the fan, measure the shroud opening diameter.

You're just jealous because you can't hear the voices!

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1963 Plymouth Fury 440/Torqueflite
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post #15 of 49 (permalink) Old May 16th, 20, 8:05 PM
 
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Re: Possible Overheating

How thick is the radiator core vs the tanks?


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