Overheating

90Stang · July 23rd, 2006, 12:53 AM

Brand new radiator, waterpump, hoses, thermostat, electric fan, and an autometer temp gauge. it keeps building heat when i drive it. if you take the radiator cap off the temp will fall down but when you put it on the heat starts building again. and i have put on 2 different radiator caps.

turp · July 23rd, 2006, 12:54 AM

Air bubble maybe?

ChrisJ · July 23rd, 2006, 12:57 AM

Try Burping The System...

turp · July 23rd, 2006, 01:02 AM

The more I think about it the more I think that is his problem.. Try Chris' patented burping method and get back to us!

ChrisJ · July 23rd, 2006, 01:14 AM

A friend was having the same problem with his 98 Cobra...he did this and it fixed it...

90Stang · July 23rd, 2006, 03:04 PM

what pound cap should i use. right now it has a 16 pound on is that the right size.

Twist 2 Go · July 23rd, 2006, 03:26 PM

16lb cap is good. Each psi raises the boiling point by 3degrees so instead of boiling at 212F it would be 260F w/ a 16lb cap

dcraig8 · July 25th, 2006, 12:02 PM

check your overflow tank, make sure its not cracked

stang fanatic · July 25th, 2006, 06:31 PM

you replaced your lower radiator hose? make sure it has the spring in it still and isnt collapsing by getting to operating temp, rev it and see if it collapses or sucks itself together. it wont collapse with the cap loose or off because if cant develope pressure . if the hose IS collapsing, then its not getting any coolant when it does

5literJeff · July 25th, 2006, 07:38 PM

Run the engine with the radiator cap off and look for air bubbles in the coolant coming up to the cap.

If you have air bubbles coming up that most likely indicates a broken head gasket or cracked head that is allowing combustion pressure to escape into the cooling system, thus pressurizing it further and causing overheating as you describe. Also you might notice coolant in your oil or other containments in your coolant which would also be a red flag.

stang fanatic · July 25th, 2006, 07:43 PM

generally though you'll push coolant out the overflow (more than it can hold) cuz the compression must displace something if its in there, which is the coolant

ttop5.0 · July 26th, 2006, 06:14 AM

ok so what is the cause for it boiling over into the overflow, because i am having the same thing wrong with my 85 gt 5 liter??

stang fanatic · July 26th, 2006, 12:10 PM

he never said it was boiling over into the overflow...he said it was building heat. a bad sensor can tell you its overheating when its not. Dont get me wrong here...were all going by the info he posted which said nothing about overflowing. if thats the case, then yes...look into compression.
Snap-on sells a fairly inexpensive coolant sniffer/tester that utilizes 2 stages of dyed water...the dye changes colors when there is combustion present(yellow is gasoline-green if diesel). i suggest this method if combustion IS what you suspect. an infrared digital thermometer is a great way to ensure the car is actually overheating.

stang fanatic · July 26th, 2006, 12:12 PM

Posted: Wed Jul 26, 2006 4:14 am Post subject: Re: Overheating

--------------------------------------------------------------------------------

ok so what is the cause for it boiling over into the overflow, because i am having the same thing wrong with my 85 gt 5 liter??
ok...what all have YOU done to yours? just having a bad lip on the radiator cap seat can duplicate a bad cap.

cdunc24 · July 26th, 2006, 01:34 PM

I need to jump in on this cause I am having a similar problem w/ overheating in my 97 V6 car w/ a 95 5.0 engine (I didn't do the swap so I don't know the particulars). I haven't changed anything but I did just buy the car. Maybe I did this wrong but I started my car and took the radiator cap off, within about 15 seconds the coolant started to overflow. I figured maybe it was an air pocket or something so I let it keep running and it continued to bubble up and occasionally out. After reading what you said about the cap I had this question and I'm pretty sure the 2 are related. I also have a 16lb cap but when my temp gets up to the 215 deg line (I have a regular temp guage) I can hear the coolant boiling inside. According to what you said that's something wrong. I checked my hoses and their good and I can't really tell if the oil and cool. are mixed. I know this is a long message but if you need more info let me know. I appreciate you help w/ this too.

cdunc24 · July 26th, 2006, 01:40 PM

I'm having trouble w/ my drive belt also. Just replaced the tensioner cause it was wore slap out, you could deflect the belt about 4" by hand, now, even w/ the new one it still bounces like cazy, could that affect the water pump? also what could cause that? a warped pulley maybe?

stang fanatic · July 26th, 2006, 04:09 PM

either your cap isnt sealing correctly, or that belt is too loose and the belt is slipping on the water pump pulley. a new belt should barely fit with the tension all the way up. i tried 3 belts before i found the right one...the others were too loose and and slipping cause the tensioner was all the way down

stang fanatic · July 26th, 2006, 04:10 PM

not to say you couldnt have other issues since you have not done other cooling systm repairs, like a partially clogged radiator

90Stang · July 29th, 2006, 09:43 PM

i just pulled the heads took them to the shop and got them checked. installed them with new gasgets and the car still buids heat. i was driving on the highway after installing the heads and my temp gauge got to 226 and kept on going up really slow.

stang fanatic · July 31st, 2006, 06:30 PM

you need to buy you a temp gun, and ck your temp at you manifold or outlet to the radiator and verify your gauge readings first. once youve done that and are honestly overheating, then look to other causes. thorough troubleshooting will lead to less finances being burned for no reason

July 23rd, 2006, 12:53 AM	#1
90Stang Regular 2005 Mustang Join Date: Jul 2006 Location: Oklahoma City Posts: 176	Overheating Brand new radiator, waterpump, hoses, thermostat, electric fan, and an autometer temp gauge. it keeps building heat when i drive it. if you take the radiator cap off the temp will fall down but when you put it on the heat starts building again. and i have put on 2 different radiator caps.

July 23rd, 2006, 12:54 AM	#2
turp Moderator 1989 MUSTANG LX 5.0 16.17@86.21(bone stock on street tires) Join Date: Aug 2005 Location: Virginia Beach, VA Posts: 2,893	Air bubble maybe? __________________ SUPPORT YOUR LOCAL HOOKERS....HUG A TOW TRUCK DRIVER! Donate to lxhatch@gmail.com

July 23rd, 2006, 12:57 AM	#3
ChrisJ MuchCoolerThanGTsetGO 2002 Mustang GT SLOW Join Date: Jun 2006 Location: Shepherdsville, Kentucky Posts: 16,283	Try Burping The System... __________________ My Junk www.myspace.com/cjobe

July 23rd, 2006, 01:02 AM	#4
turp Moderator 1989 MUSTANG LX 5.0 16.17@86.21(bone stock on street tires) Join Date: Aug 2005 Location: Virginia Beach, VA Posts: 2,893	The more I think about it the more I think that is his problem.. Try Chris' patented burping method and get back to us! __________________ SUPPORT YOUR LOCAL HOOKERS....HUG A TOW TRUCK DRIVER! Donate to lxhatch@gmail.com

July 23rd, 2006, 01:14 AM	#5
ChrisJ MuchCoolerThanGTsetGO 2002 Mustang GT SLOW Join Date: Jun 2006 Location: Shepherdsville, Kentucky Posts: 16,283	A friend was having the same problem with his 98 Cobra...he did this and it fixed it... __________________ My Junk www.myspace.com/cjobe

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July 23rd, 2006, 03:04 PM	#6
90Stang Regular 2005 Mustang Join Date: Jul 2006 Location: Oklahoma City Posts: 176	what pound cap should i use. right now it has a 16 pound on is that the right size.

July 23rd, 2006, 03:26 PM	#7
Twist 2 Go Hardcore Enthusiast Join Date: Aug 2005 Location: Chesapeake, Virginia Posts: 1,716	16lb cap is good. Each psi raises the boiling point by 3degrees so instead of boiling at 212F it would be 260F w/ a 16lb cap __________________ 88 Mustang Coupe 2006 FFW Richmond True Street Runner-Up www.rickscarcare.net http://img146.imageshack.us/img146/2158/ricksadql2.jpg

July 25th, 2006, 12:02 PM	#8
dcraig8 Regular Join Date: Jun 2006 Location: san antonio texas Posts: 124	check your overflow tank, make sure its not cracked

July 25th, 2006, 06:31 PM	#9
stang fanatic Enthusiast Join Date: May 2006 Location: El Paso, Tx Posts: 855	you replaced your lower radiator hose? make sure it has the spring in it still and isnt collapsing by getting to operating temp, rev it and see if it collapses or sucks itself together. it wont collapse with the cap loose or off because if cant develope pressure . if the hose IS collapsing, then its not getting any coolant when it does __________________ "The gods too are fond of a joke." "If I had only known, I would have been a locksmith. "

July 25th, 2006, 07:38 PM	#10
5literJeff Regular Join Date: Jul 2006 Location: Blue Ridge, South Carolina Posts: 260	Run the engine with the radiator cap off and look for air bubbles in the coolant coming up to the cap. If you have air bubbles coming up that most likely indicates a broken head gasket or cracked head that is allowing combustion pressure to escape into the cooling system, thus pressurizing it further and causing overheating as you describe. Also you might notice coolant in your oil or other containments in your coolant which would also be a red flag.

July 25th, 2006, 07:43 PM	#11
stang fanatic Enthusiast Join Date: May 2006 Location: El Paso, Tx Posts: 855	generally though you'll push coolant out the overflow (more than it can hold) cuz the compression must displace something if its in there, which is the coolant __________________ "The gods too are fond of a joke." "If I had only known, I would have been a locksmith. "

July 26th, 2006, 06:14 AM	#12
ttop5.0 Regular Join Date: May 2006 Posts: 109	ok so what is the cause for it boiling over into the overflow, because i am having the same thing wrong with my 85 gt 5 liter??

July 26th, 2006, 12:10 PM	#13
stang fanatic Enthusiast Join Date: May 2006 Location: El Paso, Tx Posts: 855	he never said it was boiling over into the overflow...he said it was building heat. a bad sensor can tell you its overheating when its not. Dont get me wrong here...were all going by the info he posted which said nothing about overflowing. if thats the case, then yes...look into compression. Snap-on sells a fairly inexpensive coolant sniffer/tester that utilizes 2 stages of dyed water...the dye changes colors when there is combustion present(yellow is gasoline-green if diesel). i suggest this method if combustion IS what you suspect. an infrared digital thermometer is a great way to ensure the car is actually overheating. __________________ "The gods too are fond of a joke." "If I had only known, I would have been a locksmith. "

July 26th, 2006, 12:12 PM	#14
stang fanatic Enthusiast Join Date: May 2006 Location: El Paso, Tx Posts: 855	Posted: Wed Jul 26, 2006 4:14 am Post subject: Re: Overheating -------------------------------------------------------------------------------- ok so what is the cause for it boiling over into the overflow, because i am having the same thing wrong with my 85 gt 5 liter?? ok...what all have YOU done to yours? just having a bad lip on the radiator cap seat can duplicate a bad cap. __________________ "The gods too are fond of a joke." "If I had only known, I would have been a locksmith. "

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July 26th, 2006, 01:34 PM	#15
cdunc24 Regular Join Date: Jul 2006 Location: H.H., TX Posts: 62	I need to jump in on this cause I am having a similar problem w/ overheating in my 97 V6 car w/ a 95 5.0 engine (I didn't do the swap so I don't know the particulars). I haven't changed anything but I did just buy the car. Maybe I did this wrong but I started my car and took the radiator cap off, within about 15 seconds the coolant started to overflow. I figured maybe it was an air pocket or something so I let it keep running and it continued to bubble up and occasionally out. After reading what you said about the cap I had this question and I'm pretty sure the 2 are related. I also have a 16lb cap but when my temp gets up to the 215 deg line (I have a regular temp guage) I can hear the coolant boiling inside. According to what you said that's something wrong. I checked my hoses and their good and I can't really tell if the oil and cool. are mixed. I know this is a long message but if you need more info let me know. I appreciate you help w/ this too.

July 26th, 2006, 01:40 PM	#16
cdunc24 Regular Join Date: Jul 2006 Location: H.H., TX Posts: 62	I'm having trouble w/ my drive belt also. Just replaced the tensioner cause it was wore slap out, you could deflect the belt about 4" by hand, now, even w/ the new one it still bounces like cazy, could that affect the water pump? also what could cause that? a warped pulley maybe?

July 26th, 2006, 04:09 PM	#17
stang fanatic Enthusiast Join Date: May 2006 Location: El Paso, Tx Posts: 855	either your cap isnt sealing correctly, or that belt is too loose and the belt is slipping on the water pump pulley. a new belt should barely fit with the tension all the way up. i tried 3 belts before i found the right one...the others were too loose and and slipping cause the tensioner was all the way down __________________ "The gods too are fond of a joke." "If I had only known, I would have been a locksmith. "

July 26th, 2006, 04:10 PM	#18
stang fanatic Enthusiast Join Date: May 2006 Location: El Paso, Tx Posts: 855	not to say you couldnt have other issues since you have not done other cooling systm repairs, like a partially clogged radiator __________________ "The gods too are fond of a joke." "If I had only known, I would have been a locksmith. "

July 29th, 2006, 09:43 PM	#19
90Stang Regular 2005 Mustang Join Date: Jul 2006 Location: Oklahoma City Posts: 176	i just pulled the heads took them to the shop and got them checked. installed them with new gasgets and the car still buids heat. i was driving on the highway after installing the heads and my temp gauge got to 226 and kept on going up really slow.

July 31st, 2006, 06:30 PM	#20
stang fanatic Enthusiast Join Date: May 2006 Location: El Paso, Tx Posts: 855	you need to buy you a temp gun, and ck your temp at you manifold or outlet to the radiator and verify your gauge readings first. once youve done that and are honestly overheating, then look to other causes. thorough troubleshooting will lead to less finances being burned for no reason __________________ "The gods too are fond of a joke." "If I had only known, I would have been a locksmith. "