What fans does it have now?
Over heating need help with fan choices
Hello I have a 1991 5.0 and I am having trouble keeping it cool. It has no ac and a dual electric fan with a shroud. When I am moving it stays cool but when I am at idle it gets hot. I live in Texas and it is 95-100 during the day and I don’t want it to over heat. I am looking to get better fans for it. I don’t know what fans are on it now because I bought it like this. What fans do you recommend? What cfm? Thanks
1 - 9 of 9 Posts
Was just a thread on this last week
(104) Fox Body Electric Fan Recommendations | Ford Mustang Forums (corral.net)
Since you are getting hot at idle, can I ask what the condition of the radiator is? Are the fins in decent shape? Internally, is there crud clogging the passageways? Does the dual fan setup shroud the entire radiator, or only cover a portion?
(104) Fox Body Electric Fan Recommendations | Ford Mustang Forums (corral.net)
Since you are getting hot at idle, can I ask what the condition of the radiator is? Are the fins in decent shape? Internally, is there crud clogging the passageways? Does the dual fan setup shroud the entire radiator, or only cover a portion?
What coolant temp do you consider "hot".Hello I have a 1991 5.0 and I am having trouble keeping it cool. It has no ac and a dual electric fan with a shroud. When I am moving it stays cool but when I am at idle it gets hot. I live in Texas and it is 95-100 during the day and I don’t want it to over heat. I am looking to get better fans for it. I don’t know what fans are on it now because I bought it like this. What fans do you recommend? What cfm? Thanks
"How much do you want to spend"
Basic **** to dry cheapest to most expensive for low speed overheat conditions.
#1, If you have underdrive pulley's on the car remove them and put them in the trash. (These cause multiple problems that combine to make engines overheat.)
#2, Take a pressure washer and clean out the radiator from the engine side, or remove it to do this. Not too close though and bend the fins with the water.
#3, Pick a fan with a shroud as big as possible to fill the core area. That's not the end tanks, it's the finned area.
#4, Make sure you're providing enough juice to the fan(s). If it's a dual be running a 30/40 relay for each motor minimum. If it's a big single, 75amp relay. This includes having a 3G alternator upgrade.
#5, Take a look at the coolant, does it have a bunch of floating crap in it? If so, may want to do a system/radiator flush then replace with coolant+distilled+water wetter.
If you want to throw parts at it.
#1, order a cobra (overdrive) pulley for the water pump from ASP. $80.
#2, order a new radiator from Summit. You can get an aluminum Griffin for about $200.
#3, order a Drale big dual fan shroud setup. $280-$300.
Lastly, if the previous owner ever ran any of that radiator stop leak **** through it it's likely the radiator is ruined.
#1, If you have underdrive pulley's on the car remove them and put them in the trash. (These cause multiple problems that combine to make engines overheat.)
#2, Take a pressure washer and clean out the radiator from the engine side, or remove it to do this. Not too close though and bend the fins with the water.
#3, Pick a fan with a shroud as big as possible to fill the core area. That's not the end tanks, it's the finned area.
#4, Make sure you're providing enough juice to the fan(s). If it's a dual be running a 30/40 relay for each motor minimum. If it's a big single, 75amp relay. This includes having a 3G alternator upgrade.
#5, Take a look at the coolant, does it have a bunch of floating crap in it? If so, may want to do a system/radiator flush then replace with coolant+distilled+water wetter.
If you want to throw parts at it.
#1, order a cobra (overdrive) pulley for the water pump from ASP. $80.
#2, order a new radiator from Summit. You can get an aluminum Griffin for about $200.
#3, order a Drale big dual fan shroud setup. $280-$300.
Lastly, if the previous owner ever ran any of that radiator stop leak **** through it it's likely the radiator is ruined.
To add to what others have mentioned, take a look and make sure the side deflectors are not missing, or if there, actually still keeping engine bay air from churning around the ends of the radiator. On my Mark VII I was also having slow speed/stationary cooling issues. Got to looking and my passenger side was gone (I do not remember removing it) and the driver side was soo floppy it was not touching the radiator. This meant hot air was churning back to in front of the radiator on both sides. Installed new ones and BIG difference.
Link to LMR video for reference
Link to LMR video for reference
Second note:
You mention you have two fans and a shroud. What fans? Because if they are ebay specials or even the fan/shroud combo from Mishimoto, well, there is the problem.
You mention you have two fans and a shroud. What fans? Because if they are ebay specials or even the fan/shroud combo from Mishimoto, well, there is the problem.
No offense guys, but the op hasn't even mentioned the coolant temperature range that his car is seeing. Factory temp gauge?
He needs to provide the info before a diagnosis can be made.
He needs to provide the info before a diagnosis can be made.
1 - 9 of 9 Posts
- This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Ford Mustang Forums
A forum community dedicated to Ford Mustang owners and enthusiasts. Come join the discussion about performance, production numbers, VIN decoders, modifications, troubleshooting, power adders, DIY tutorials, and more!
Full Forum Listing
Explore Our Forums
Recommended Communities
