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Old 12-16-2009, 07:25 PM   #1
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Unhappy Coolant System

Hello All-
I have a 1994 mustang. It has been leaking a rediculous amount of antifreeze. I added some today but I think there is an air bubble in the system somewhere. I tried to keep the cap off where i poured the antifreeze in and it burped a little but not enough. Should I take off the radiator cap while I add antifreeze? and I read something about taking off the crossover plug...what is that? Any help would be appriciated
thanks
nay
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Old 12-17-2009, 03:45 AM   #2
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Re: Coolant System

The crossover plug refers to the 96-up 4 valve Cobras that have a crossover tube in the front of the engine. Leave the cap off while adding antifreeze and monitor the temperature. Start while the engine is cold and you will know it is burped once it gets to operating temp. Sometimes it takes a while but about 15-20 minutes of idling should burp the system. Check for a sticking thermostat too.
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Old 12-17-2009, 08:06 AM   #3
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Re: Coolant System

yea you should see a coolant (hard black thick line) in front of the upper intake with a plug facing upwards you can remove and poor coolant in here,usually air gets trapped here as its the highest point in the coolant system.
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Old 12-17-2009, 01:07 PM   #4
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Re: Coolant System

so new development... should there be hard stuff in my bottom hose im pretty sure when i squeeze it i shouldnt feel crunchy **** in there... blah!
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Old 12-17-2009, 01:55 PM   #5
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Re: Coolant System

Sounds like you need to flush the system as well, but AFTER you remove and clean/replace the bottom hose.
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Old 12-17-2009, 03:10 PM   #6
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Re: Coolant System

if you dont change your coolant regularly it can get crap in it from reactions with the aluminum in the heads~ it sounds like it needs a really good full system flush. You can do it with your hose i guess perhaps someone has cleaner~ but i wouldnt go overborad a hose will probably be fine then flush with 50/50 premix (not good to use all the crap tap water has in it in your engine)
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Old 12-17-2009, 05:15 PM   #7
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Re: Coolant System

I replaced the bottom hose. My top hose that goes into my radiator still refuses to get antifreeze in it. what am i doing wrong? i've tried "burping" it. could this be a thermostat problem? someone also metioned a cracked head *crossing fingers please no* but how would i tell if that is the problem? what are the signs?
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Old 12-17-2009, 05:46 PM   #8
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Re: Coolant System

If your top hose isn't filling with coolant, it may be that your thermostat is stuck shut. Does your temp gage get near "H" after the car warms up? If so, I'd bet on the thermostat needing replaced, assuming that there is sufficient coolant in the system. One way to tell that you have an internal coolant leak is to see if you have coolant in the oil.
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Old 12-24-2009, 12:12 AM   #9
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Re: Coolant System

Ya I would try changing the T-stat and get a good gasket with it bc some of the ones that come with it are cheap. Like $7 total. Also I take the top hose and squeeze it and squeeze it you should get fluid and air moving in the hose anr work the air out.
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