Vintage Air Solenoid & Engine Overheating Problem - Team Camaro Tech
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post #1 of 7 (permalink) Old Aug 5th, 17, 08:07 AM Thread Starter
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Tom
 
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Vintage Air Solenoid & Engine Overheating Problem

I'll try to make this simple but I'm not so sure I can...

I have an SBC, Vintage Air A/C, dakota digital guages and i think that's all that's relevant...

A long time ago, when i first started to run my camaro, I noticed that the Vintage Air A/C solenoid between the manifold & heater core got really hot so I just disconnected it. I drove without A/C for a while and cruised with the windows down all the time.

Fast forward to now and it's blazing hot outside to I charged my A/C and reconnected the solenoid after talking to Vintage air and being assured that the solenoids run hot. I just picked the car up from storage, drove it the 3 miles home and the temp guage ran up to 230 and water was bubbling out of the radiator overflow....

I disconnected the Solenoid & AC clutch wire and it holds steady at 190.. I can't for the life of me figure out how/why the heater hose solenoid would cause the temp to climb that high. The reason i mentioned the DD gauges is that the temp sensor is directly under the heater hose coming out of the manifold if that means anything...

Any help would be wonderful, I'm stumped.
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post #2 of 7 (permalink) Old Aug 5th, 17, 02:43 PM
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Re: Vintage Air Solenoid & Engine Overheating Problem

Your cooling system is not adequate to cool your car and run your AC

Too small of radiator, shroud/fan or other issues with cooling system.

And yes the VA solenoid gets so hot you can't touch it.
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post #3 of 7 (permalink) Old Aug 5th, 17, 03:27 PM Thread Starter
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Tom
 
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Re: Vintage Air Solenoid & Engine Overheating Problem

Quote:
Originally Posted by Vega$69 View Post
Your cooling system is not adequate to cool your car and run your AC

Too small of radiator, shroud/fan or other issues with cooling system.

And yes the VA solenoid gets so hot you can't touch it.
Thank you for the response - I have a large aftermarket aluminium radiator with electric fan & shroud with a relatively mild 383 so i'm hoping that's not the issue and that it's something else in the cooling system. I reconnected the AC clutch but left the VA solenoid disconnected and it held rock steady at 190...

Still confused
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post #4 of 7 (permalink) Old Aug 5th, 17, 04:07 PM
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Re: Vintage Air Solenoid & Engine Overheating Problem

The valve is normally open so when you disconnect it you are always flowing through the heater core and it is helping to cool your coolant. When you connect it and turn on the AC the valve closes and flow is stopped plus you add significant thermal load to your cooling system due to the condenser in front of the radiator. I think John is likely correct.

Are your fans turning on when the AC is running?

What are the details of your radiator and fans?

Don

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post #5 of 7 (permalink) Old Aug 5th, 17, 05:50 PM Thread Starter
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Tom
 
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Re: Vintage Air Solenoid & Engine Overheating Problem

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Originally Posted by dhutton View Post
The valve is normally open so when you disconnect it you are always flowing through the heater core and it is helping to cool your coolant. When you connect it and turn on the AC the valve closes and flow is stopped plus you add significant thermal load to your cooling system due to the condenser in front of the radiator. I think John is likely correct.

Are your fans turning on when the AC is running?

What are the details of your radiator and fans?

Don
thanks for the feedback, I'll go get some details - it's a few years since i purchased the rad & fan so will need to dig through paperwork.

I don't have the fan coming on with the AC - I'll correct that... I'll also hook it up to the ECU temp gauge rather than the silly radiator probe thingy it has today.

Please understand, I wasn't doubting John - more doubting myself - did I do something super stupid like put a reverse flow pump in or a thermostat upside down - with me, I could have quite easily done something stupid.

I'll get details and get back to you all - thanks for the help so far!
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post #6 of 7 (permalink) Old Aug 5th, 17, 07:08 PM
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Re: Vintage Air Solenoid & Engine Overheating Problem

What you're looking for in the end is a 15-20 degree temperature difference between the inlet and outlet of the radiator. I agree with John also, either a radiator or airflow issue.

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post #7 of 7 (permalink) Old Aug 5th, 17, 07:31 PM
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Re: Vintage Air Solenoid & Engine Overheating Problem

Quote:
Originally Posted by 1968RallySport View Post
What you're looking for in the end is a 15-20 degree temperature difference between the inlet and outlet of the radiator. I agree with John also, either a radiator or airflow issue.
Forgot the word minimum of 15-20 degrees.

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