Overheating with New Cap - Team Camaro Tech
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post #1 of 16 (permalink) Old Jun 3rd, 18, 07:39 AM Thread Starter
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Can someone tell me what’s up here?

Had an issue with the top radiator hose collapsing and fixed that with a new radiator cap! But now it overheats, what’s up with that?

Bad “new” cap?

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post #2 of 16 (permalink) Old Jun 3rd, 18, 07:56 AM
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Re: Overheating with New Cap

Quote:
Originally Posted by DDZ28 View Post
Can someone tell me whatís up here?

Had an issue with the top radiator hose collapsing and fixed that with a new radiator cap! But now it overheats, whatís up with that?

Bad ďnewĒ cap?
Define overheats. Temperature goes too high or it pukes coolant.

Don

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post #3 of 16 (permalink) Old Jun 3rd, 18, 08:24 AM Thread Starter
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Quote:
Originally Posted by dhutton View Post
Quote:
Originally Posted by DDZ28 View Post
Can someone tell me what’s up here?

Had an issue with the top radiator hose collapsing and fixed that with a new radiator cap! But now it overheats, what’s up with that?

Bad “new” cap?
Define overheats. Temperature goes too high or it pukes coolant.

Don
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post #4 of 16 (permalink) Old Jun 3rd, 18, 09:14 AM
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Re: Overheating with New Cap

Top hose is the return line and should be pressurized by the water pump. Since it is colapsing your pump is sucking but not getting anything through from the block.

I suspect that is due to a defective thermostat that is stuck closed. If the coolant is not circulating then I wouldn't be surprised if it is over heating.

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post #5 of 16 (permalink) Old Jun 3rd, 18, 09:34 AM
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Re: Overheating with New Cap

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Originally Posted by Larger Dave View Post
Top hose is the return line and should be pressurized by the water pump. Since it is colapsing your pump is sucking but not getting anything through from the block.

I suspect that is due to a defective thermostat that is stuck closed. If the coolant is not circulating then I wouldn't be surprised if it is over heating.

Big Dave
X2. Sucking from lower hose and not returnjng coolant to the radiator through the top hose will create negative pressure in the radiator and cause the hose to collapse.

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post #6 of 16 (permalink) Old Jun 3rd, 18, 09:56 AM Thread Starter
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Quote:
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Quote:
Originally Posted by Larger Dave View Post
Top hose is the return line and should be pressurized by the water pump. Since it is colapsing your pump is sucking but not getting anything through from the block.

I suspect that is due to a defective thermostat that is stuck closed. If the coolant is not circulating then I wouldn't be surprised if it is over heating.

Big Dave
X2. Sucking from lower hose and not returnjng coolant to the radiator through the top hose will create negative pressure in the radiator and cause the hose to collapse.
As mentioned I replaced the cap and the issue of the collapsing hose issue went away, now it overheats and pushed coolant out the overflow hose.

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post #7 of 16 (permalink) Old Jun 3rd, 18, 10:20 AM
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Re: Overheating with New Cap

replace the thermostat !
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post #8 of 16 (permalink) Old Jun 3rd, 18, 10:22 AM
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Re: Overheating with New Cap

I don't see how changing out the radiator cap could effect a collapsing hose...?
As stated, I would start with a new thermostat (they're cheap).

Are both radiator caps rated at the same PSI?

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post #9 of 16 (permalink) Old Jun 3rd, 18, 10:52 AM Thread Starter
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Old cap was 15# new one is 16#, I am in agreement to change the Thermostat.

Just looking for other input. Thanks

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post #10 of 16 (permalink) Old Jun 3rd, 18, 11:06 AM
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Re: Overheating with New Cap

Was the hose collapsing while running or after stopping and cooled off?

Don

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post #11 of 16 (permalink) Old Jun 3rd, 18, 11:13 AM Thread Starter
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After stoping and cooled off.

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post #12 of 16 (permalink) Old Jun 3rd, 18, 01:36 PM
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Re: Overheating with New Cap

Quote:
Originally Posted by DDZ28 View Post
After stopping and cooled off.
If hose is collapsing AFTER cool off, then cap vent valve is not working.
Try old cap?

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post #13 of 16 (permalink) Old Jun 3rd, 18, 01:53 PM
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Re: Overheating with New Cap

Quote:
Originally Posted by DDZ28 View Post
After stoping and cooled off.
Cooled air in system created a vacuum. Your cap is not releasing vacuum for some reason.

Don

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post #14 of 16 (permalink) Old Jun 3rd, 18, 05:30 PM Thread Starter
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Quote:
Originally Posted by dhutton View Post
Quote:
Originally Posted by DDZ28 View Post
After stoping and cooled off.
Cooled air in system created a vacuum. Your cap is not releasing vacuum for some reason.

Don
I replaced the cap and the collapsing hose problem is gone but now it overheats!

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post #15 of 16 (permalink) Old Jun 3rd, 18, 05:46 PM
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Re: Overheating with New Cap

Quote:
Originally Posted by DDZ28 View Post
I replaced the cap and the collapsing hose problem is gone but now it overheats!
Iím no expert but it seems that if the old cap was defective/stuck itís possible you were building higher than 16psi pressure preventing overheating and puking coolant. Iím sure one of the resident experts will weigh in soon.

What was the temperature with the old cap and the new cap?

Don

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