Cooling system problem.
11-14-2009, 05:23 PM
#1
1st Gear Member
Thread Starter
Join Date: Aug 2009
Location: Michigan
Posts: 53
Cooling system problem.
1994 GT Mustang 5.0
Recently did a coolant flush due to a slight overheating problem. it was still drivable but it was just getting to hot for spirited driving. After that the problem went away for about a day. Then came back and was even worse. to the point of when I was getting on the highway it was at the L in normal on the gauge so i let off the gas and it cooled down fairly quickly. after that i noticed it had a 18 PSI cap from the previous owner put a 16PSI cap on and it did not help. now i just changed the thermostat. let it warm up to check for leaks it was all fine went for a test drive the firs acceleration the temp gauge shot up to the red. instantly i shut it off waited about a min. and the temp gauge was normal so i coasted home and that's were im at right now.
Recently did a coolant flush due to a slight overheating problem. it was still drivable but it was just getting to hot for spirited driving. After that the problem went away for about a day. Then came back and was even worse. to the point of when I was getting on the highway it was at the L in normal on the gauge so i let off the gas and it cooled down fairly quickly. after that i noticed it had a 18 PSI cap from the previous owner put a 16PSI cap on and it did not help. now i just changed the thermostat. let it warm up to check for leaks it was all fine went for a test drive the firs acceleration the temp gauge shot up to the red. instantly i shut it off waited about a min. and the temp gauge was normal so i coasted home and that's were im at right now.
Last edited by wterrell; 11-14-2009 at 05:25 PM.
11-14-2009, 05:35 PM
#2
1st Gear Member
Join Date: Oct 2009
Location: colorado
Posts: 140
well im not a very good mechanic and im usually on this site for advice myself
but it could be a couple different things like a head gasket or water pump i recently had a similar problem on my mustang and the fans werent turning on and it ended up being a coolin fan temperature switch so it could be a number of things you can check your head gasket by smelling the exhaust and see if it smells like antifreeze or you could run a pressure test on your cooling system also and check to see if the water pump pulley wiggles or leaks then you need a new water pump and for the fan start it up and let it idle until it reaches op temp and see if your fans turn on. 
but it could be a couple different things like a head gasket or water pump i recently had a similar problem on my mustang and the fans werent turning on and it ended up being a coolin fan temperature switch so it could be a number of things you can check your head gasket by smelling the exhaust and see if it smells like antifreeze or you could run a pressure test on your cooling system also and check to see if the water pump pulley wiggles or leaks then you need a new water pump and for the fan start it up and let it idle until it reaches op temp and see if your fans turn on.
11-14-2009, 11:45 PM
#7
4th Gear Member
Join Date: Jan 2007
Location:
Posts: 1,999
If the temperature is shooting up on the highway. The problem is not the fan.
If you recently did a flush. Maybe there is still air in the cooling system. There is a dozen ways to rid a system of air. My favourite is to fill the coolant resorvoir to MAX. Run the engine through a couple hot, then cold cycles. The recovery system will purge of any air.
If you recently did a flush. Maybe there is still air in the cooling system. There is a dozen ways to rid a system of air. My favourite is to fill the coolant resorvoir to MAX. Run the engine through a couple hot, then cold cycles. The recovery system will purge of any air.
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