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GT500 coolant problem!

gt500 coolant shelby lethal performance help leak

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#1 OFFLINE   Beaubear

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Posted 16 December 2012 - 11:42 AM

First off sorry if I posted in wrong section and if this was already done.

Ok so about 2 months ago, I went for a nice little drive. Halfway into it, it started to rain. I noticed steam coming through the vents. I thought to myself, water and heat make steam. So it's nothing to worry about. About 5 minutes later I'm on the side of the road with an empty coolant tank. I refilled it up with water just to get home and it overheated again in less then 1 minute. So I assumed I was having a thermostat problem. Bummed a ride down to lethal performance picked up a new 170 degree and thought that solve the issue.

A month after that, took a cruise down us1. New thermostat, full tank of coolant, and cool weather. As I was pulling into my destination, I noticed the temp gauge pegged out to H and ac was blowing hot air on its own. Pop the hood and once again had an empty coolant tank. WTF? This time I thought to myself, maybe I have a bad tank. So the next day I ordered a new moroso tank. It came in two weeks ago and put a fresh batch of coolant. And just today for shits and giggles I checked the level before I went for a drive and it was damn near empty. I'm running out of ideas and most importantly money. Help please
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#2 OFFLINE   GT500FLYBOY

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Posted 16 December 2012 - 01:32 PM

Make sure your secondary supercharger intake cooling system is working properly. It has an electric pump that should be pumping coolant all the time. If it isn't pumping, then the intake can get very hot with the pressurized air, overheating the engine, and making the engine coolant boilover. To check your secondary system pump - just take the cap off when it's cool and check for flow. It should never stop. If it does - check all the connections to the pump or replace. It sits in front of the a/c condensor and behind the bumper. I had to replace my pump due to intermittant failure with similar symptoms.

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#3 OFFLINE   Beaubear

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Posted 16 December 2012 - 02:12 PM

If that is the problem I will be happy. I did kinda bang the pump up a little bit while putting on the new heat exchanger. I will check it in the morning. Any recommendations on a new pump if that's the case. Another oem or an aftermarket? Thanks
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#4 OFFLINE   GT500FLYBOY

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Posted 16 December 2012 - 02:59 PM

Oem is fine. Warranty item.

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#5 OFFLINE   tesgt350

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Posted 16 December 2012 - 03:03 PM

Did you try bleeding the System?

#6 OFFLINE   Beaubear

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Posted 16 December 2012 - 04:04 PM

No I haven't tried to bleed the system. i did a complete flush with the heat exchanger. How would I go about bleeding?
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#7 OFFLINE   Secondo

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Posted 16 December 2012 - 04:13 PM

Where is the steam coming from exactly and where is the coolant going? Is there white smoke coming from the tailpipes? Hope it's not a head gasket.

#8 OFFLINE   Beaubear

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Posted 16 December 2012 - 05:20 PM

That's the thing I don't know. The coolant isn't leaking its disappearing. Maybe it evaporates cause I leave it parked in one spot and I see no leakage. It only steamed the first time so I wanna rule out head gasket.
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#9 OFFLINE   GT500FLYBOY

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Posted 16 December 2012 - 05:26 PM

You mentioned the heat exchanger - I imagine you upgraded to the double-wide dual-fan unit from C&R Racing? Did you ugrade the radiator as well?

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#10 OFFLINE   Beaubear

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Posted 16 December 2012 - 05:41 PM

No I did not upgrade the radiator. And I only upgraded to the afco w/out fans since I'm still on a stock supercharger.
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#11 OFFLINE   GT500FLYBOY

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Posted 16 December 2012 - 05:59 PM

Ok - I'll still recommend you check that pump. Keep checking it everytime you drive. Also be sure your radiator fan is running - both low and high speed. If it's not running after warmup, you could check connections or try swapping relays. I had to replace the fan altogether at one point, too. Connector had overheated and melted.

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Whipple monoblade TB. C&R radiator, dual fan I/C heat exchanger.
730 RWHP, 680 RWTQ. 1/4 11.18 @ 127.


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#12 OFFLINE   Beaubear

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Posted 16 December 2012 - 06:22 PM

Yea the fan is good. I had to change when it comes on after doing the new thermostat. Hopefully I can get around to checking that pump tomorrow. I appreciate all the help and suggestion guys.
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#13 OFFLINE   Secondo

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Posted 17 December 2012 - 03:37 PM

Ok, you better take the spark plugs out and check them just to make sure.

#14 OFFLINE   Beaubear

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Posted 21 December 2012 - 02:02 PM

Thanks for all the help. Found out it was just a bad relay
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#15 OFFLINE   GT500FLYBOY

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Posted 21 December 2012 - 03:33 PM

Have had that as well. For the pump or the fan?

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#16 OFFLINE   Beaubear

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Posted 21 December 2012 - 03:56 PM

It was the pump relay. So I did that 20 amp fuse with the twist and bends and I got some flow from my tank. Checked the spark plugs and they were fine but I threw in some new brisk racing plugs while I was under there. Fan works. Kicks on when its suppose to.
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#17 OFFLINE   Secondo

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Posted 21 December 2012 - 04:55 PM

Whew! Nice happy ending to this story.

#18 OFFLINE   Beaubear

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Posted 13 January 2013 - 02:00 PM

Back at it again. That relay I replaced solved the flow of the intercooler pump to actually start pumping again. Added all new fluids and still the IC reservoir tank is disappearing with no signs of leaking. It's really getting to me. I used a pressure test and it held. Maybe I need to replace the pump also since I already did the relay? HELP PLEASE
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#19 OFFLINE   GT500FLYBOY

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Posted 13 January 2013 - 02:08 PM

You must a have a leak. Maybe try doing the black lite test. Share your mods again...

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Whipple monoblade TB. C&R radiator, dual fan I/C heat exchanger.
730 RWHP, 680 RWTQ. 1/4 11.18 @ 127.


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#20 OFFLINE   0201212

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Posted 13 January 2013 - 04:02 PM

Check the two hoses that go back into the fire wall behind the supercharger. They can move and rub up against the egr piping and get a small hole in them.
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#21 OFFLINE   Albino500

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Posted 13 January 2013 - 04:28 PM

Back at it again. That relay I replaced solved the flow of the intercooler pump to actually start pumping again. Added all new fluids and still the IC reservoir tank is disappearing with no signs of leaking. It's really getting to me. I used a pressure test and it held. Maybe I need to replace the pump also since I already did the relay? HELP PLEASE

Did you pressure check the cap to see if it holds until 10 PSI ?
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#22 OFFLINE   Beaubear

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Posted 14 January 2013 - 09:06 PM

Mods are 2.59 pulley, afco heat exchanger, bassani 3 inch, p&p bbk 65mm throttle body, 170 degree thermostat, moroso ic tanks. Steeda intake and tune and some other stuff. I took off the front bumper today and left it in the garage. I'm gonna check in the morning if any fluids are on the ground without the sun and heat evaporating it.
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#23 OFFLINE   Beaubear

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Posted 14 January 2013 - 09:07 PM

And yes it held 16 psi since that what the cap has on it. And I just hit 40k so it could be something failing
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#24 OFFLINE   GT500FLYBOY

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Posted 15 January 2013 - 02:44 AM

Well - couple things. Can you monitor engine temp? I think this all comes down to heat - and you must be leaking somewhere.

The lower thermostat doesn't help - it just opens sooner. The extra capacity tanks don't help much - they just look good. The Afco h/e doesn't really do the job we all hoped for. It does extend the period where you have power until the heat soak sets in, but it doesn't resolve it - and heat still builds up. The dual fans are really needed so the h/e is working even when the car isn't moving - and doesn't allow the engine to get hotter. The smaller pulley on the stock blower creates more boost, but with the smaller displacement, more heat. And you still have the stock radiator - which won't remove the extra heat of all of this. I say this since been there, done that. I'd say upgrade the radiator and get the dual fan h/e. That will solve the heat issue - for this setup - and anything else you wish to do down the line.

Edited by GT500FLYBOY, 15 January 2013 - 02:49 AM.

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#25 OFFLINE   Beaubear

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Posted 31 January 2013 - 12:25 PM

Ahh thanks I finally had some free time and I think I found the issue. That fat hose behind the radiator is dripping coolant. Hopefully that's the solution because I was about to get rid of the car
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