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Old 08-10-2018, 04:53 PM   #1
megaman8x
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Default Insane over heating issue.

I was recently driving today in my 97 sc2 and I was stuck in traffic for a while and the themometer hit a little bit over the middle mark.

So when i finally parked i see a lot of steam coming from right side of the hood, I open it up and coolant is spilling out the tank (i had the tank replaced last year) and literally emptied the entire tank on the ground.

I paniked thinking a pipe came loose or it could be water pump issue I waiting a minute or 2 for it to cool down and borrowed some anti-freeze and filled up the tank..

I didnt realize until afterwards that it was the 50/50 Dex cool version instead of the regular 50/50 prestone (Yellow) that i use.

I only filled up the tank but will this cause any damage by mixing the two?

Also what can cause the tank to fill up with so much pressure it coming out the cap when screwed on tight.

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Old 08-10-2018, 06:00 PM   #2
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Default Re: Insane over heating issue.

Read both coolant labeling for mixing reactions for compatibility or incompatibility. Other than another color of coolant from mixing, if one coolant is formulated to stay in a cooling system longer than the other, this new mix must be replaced at the recommended interval for the other coolant.

When coolant erupted from the surge tank, did you notice the cooling fan running or not?

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Old 08-10-2018, 06:20 PM   #3
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Default Re: Insane over heating issue.

no, the car was off when i opened the hood.
Everything is exactly the same, same brand except one says dex-cool on it, here are the brands.

https://shop.advanceautoparts.com/p/...2100/7020013-P


https://shop.advanceautoparts.com/p/...B&gclsrc=aw.ds

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Old 08-10-2018, 06:21 PM   #4
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Default Re: Insane over heating issue.

https://www.holtsauto.com/prestone/s...lant-coolants/

According to this, Prestone Yellow coolant is compatible with other coolants including Dexcool, even the old green stuff. I ran Dexcool for the first 8-10 years, then switched over to yellow/Zerex G-05 for the past 13 years/three changes. I suspect there was some Dexcool still in the heater loop, so I wanted something that would be compatible with it. No reaction issues that I could ever tell.

I run it at 60% to 70% concentrations and I'm still on my first radiator.

I like the yellow Zerex G-05 stuff better than the Dexcool -- no weird scum in the expansion tank now, you can buy it full strength, it's compatible with Saturns, cheap, and it's long-lived. And at higher concentrations, if you need a small top-up, just use distilled water.

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Old 08-10-2018, 08:51 PM   #5
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Default Re: Insane over heating issue.

megaman8x, your concern about mixing antifreeze may be overlooking an overheating issue. If you have a reader, use it. Display coolant temps so you have some idea of whether or not its overheating from; clogged radiator, debris blocking the ac condenser coil in front of the radiator, loose drive belt, worn out belt tensioner (belt flopping), stuck thermostat, and dead/dying/worn out cooling fan.

You can force the cooling fan on with several methods; a)if ac works - turn on ac as the cooling fan will run, b)remove the cooling fan fuse and examine the relay for pinout info - insert a wire jumper/paper clip into relay socket terminals 30 and 87 to power the cooling fan immediately or c)wait or drive until the engine overheats - the cooling fan should turn on with the engine running when you pull over to the side o the road. Personally, I would use the wire jumper method without worrying about overheating on the road somewhere.

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Old 08-11-2018, 04:53 PM   #6
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Default Re: Insane over heating issue.

Since yellow is compatible i should be able to just drain it and refill it without having to flush out the system right?


How would i be able to tell if there is a clog, I did have to to jerry rig one of the the coolant lines because it was rusted tight when i had to replace the radiator and I couldn't find a replacement.

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Old 08-11-2018, 09:00 PM   #7
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Default Re: Insane over heating issue.

OEM caps fail after 10-20 years, aftermarket caps fail after 1min-20yrs. Sounds like yours has failed.

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Old 08-12-2018, 04:21 AM   #8
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Default Re: Insane over heating issue.

Quote:
Originally Posted by hholbein View Post

I run it at 60% to 70% concentrations and I'm still on my first radiator.

I like the yellow Zerex G-05 stuff better than the Dexcool -- no weird scum in the expansion tank now, you can buy it full strength, it's compatible with Saturns, cheap, and it's long-lived. And at higher concentrations, if you need a small top-up, just use distilled water.
Yep, same here. I run G-05 at ~60% Concentrations. Works great.

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Old 08-13-2018, 02:54 PM   #9
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Default Re: Insane over heating issue.

+2 on looking at the cap. If the cap fails it will let the coolant boil at a much lower temperature because it doesn't allow the system to pressurize. The middle mark on your temperature gauge would be right about the boiling point if the system isn't pressurized.

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Old 08-13-2018, 11:34 PM   #10
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Default Re: Insane over heating issue.

Start by replacing the expansion tank cap.

Dex-Cool and Gold are compatible and won't be an issue. You can drain, flush and refill with gold at your leisure.

The rigged coolant line is going to need properly repaired. The Saturn cooling system design is slightly different from standard cooling system designs of that era of GM vehicles. Blocked lines, removal of the thermostat, etc. often can cause flow issues within the system and water pump cavitation, which will increase the odds of overheating.

Testing the cooling fans, with the AC on is a good idea as well, because if the fan is shot you can also overheat.

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