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GT500 coolant overheating

Discussion in '2013-14 Shelby GT500' started by 13BlackGT500, Jan 12, 2019 at 7:27 PM.

  1. 13BlackGT500

    13BlackGT500 New Member Established Member

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    Took my 13 GT500 to a dyno. Noticed that with every pull the intercooler coolant in the reservoir would expand really quickly, fill the reservoir, and even leak through the cap. What could be causing this? And is there a intercooler coolant thermostat?


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  2. biminiLX

    biminiLX never stock Established Member

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    Several things you’ll want check but the biggest concern is a head gasket issue under boost and pressurizing the coolant system.
    What did the shop say?
    I’d start with pressure testing the coolant system.
    -J
     
  3. SCGallo2

    SCGallo2 Balanced performance Premium Member Established Member

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    No mechanical thermostat in the I/C system. You are most likely boiling the I/C coolant due to air in the system or I/C pump not functioning properly.
     
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  4. 13BlackGT500

    13BlackGT500 New Member Established Member

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    Its the supercharger coolant, and not the engine coolant so I dont think it can be a head gasket issue. The guys at the shop just assumed there was too much coolant in the reservoir.
    I'm pretty sure it might be the pump since I dont see any flow in the coolant reservoir even at operating temperatures, but I'm not sure if flow is usually visible from the reservoir


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  5. 13BlackGT500

    13BlackGT500 New Member Established Member

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    Thanks for answering the thermostat question. Do you know whats the easiest way to check if the pump is functioning?


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  6. SCGallo2

    SCGallo2 Balanced performance Premium Member Established Member

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    You can install a jumper on the I/C pump relay (not sure which one on your model year), but a quick search in this forum will likely produce the answer. You also have a flow restrictor in line with the reservoir, so you may see little to no flow through the tank.
     
  7. RBB

    RBB Well-Known Member Established Member

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    There’s not really any visible flow on the 13-14 due to the bypass, but if you jump the relay with the engine off you can hear the pump running. If the pump is functional then you’ve probably got air in the system, need to get that out.
     
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  8. 13BlackGT500

    13BlackGT500 New Member Established Member

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    Where is the relay located? Thanks for the info


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  9. RBB

    RBB Well-Known Member Established Member

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    I don’t recall off the top of my head, been a while since I’ve had to jump it. Look in your owner’s manual, it has diagrams for both of your fuse boxes.
     
  10. Catmonkey

    Catmonkey I Void Warranties! Premium Member Established Member

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    Have you ever opened the intercooler system to change components, like installing another heat exchanger? If the systems never been opened, it sounds like a pump issue. If you're running a stock heat exchanger did the dyno operator put a fan on the heat exhanger? If not, I can see that the coolant cycling through the heat exchanger didn't have a means to transfer heat from any of the heated coolant reaching the heat exchanger.
     
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  11. 13BlackGT500

    13BlackGT500 New Member Established Member

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    Checked the pump and its good, but when I tested it I could actually see the coolant flowing through the reservoir. I believe the fuse must be bad since I couldnt see the coolant flowing before even when the car was hot. Do you know if the coolant is supposed to be flowing constantly or only when the car is up to a certain temperature?


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  12. Norton

    Norton Long-time SVT Enthusiast Established Member

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    Depends on your tune. I don't recall IAT2 that triggers the pump in a stock tune, but my tuner adjusted mine to run the pump (and VMP dual-fans) when IAT2 is above 60 degrees, so it's on most of the time.
     
  13. Catmonkey

    Catmonkey I Void Warranties! Premium Member Established Member

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    It's coolant pump setting is around 100* in the stock tune. Most tuners set it a lot lower, so it essentially runs all the time.
     
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  14. biminiLX

    biminiLX never stock Established Member

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    There was a detailed thread on here showing a wiring issue tracking back to the fuse box. Meaning the pump was good but it was wiring issue.
    Anyone else remember who started that one or where he can read up on it?
    Seems like the issue, good luck
    -J
     
  15. 13BlackGT500

    13BlackGT500 New Member Established Member

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    When I put a wire on the relay the pump started right up. I thought the issue would just be the relay. I'll test it out once I have time


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  16. Catmonkey

    Catmonkey I Void Warranties! Premium Member Established Member

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    Could be a bad relay, but check the pump once the engine is warmed up to operating temperature. I don't think the pump would energize if you had the wiring issue Bimini brought up.
     
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  17. 13BlackGT500

    13BlackGT500 New Member Established Member

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    Pump wouldnt be on even at operating temps. I'll test the relay today and check if thats been the issue


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  18. Catmonkey

    Catmonkey I Void Warranties! Premium Member Established Member

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    Jumping the relay bypasses the PCM control. What I'm saying is if it doesn't energize at operating temperature, the relay is probably bad.
     
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  19. 13BlackGT500

    13BlackGT500 New Member Established Member

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    Yea I know, I'll buy a new relay tomorrow. Hopefully that fixes the issue


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  20. sleek98

    sleek98 Well-Known Member Established Member

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    Swap the relay with another one to test.
     

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