engine running extremely hot
Thread Starter
Teching In
Joined: Jul 2010
Posts: 43
Likes: 0
From: NC
engine running extremely hot In stop and go traffic my engine temp reaches almost the redline. I have coolant new 180degree thermostat but it still over running that hot.. is the 90+ degree weather thats causing it or what anyone got any ideas
TECH Senior Member
Joined: Dec 2001
Posts: 5,399
Likes: 3
From: Jacksonville, FL
Not the hot weather, something else is going on. Was it overheating before you changed the thermostat? If it was OK before probably have air in the system. Several things can make you overheat - blocked radiator air flow, fans not coming on, radiator cap not holding pressure.........I wouldn't drive it until you get it figured out.
You probably have some air in the system still, these cars take a ton of coolant and it takes a while to get the air out if done wrong.
I would know, a shop tried to blow my engine recently..
If its not the coolant it might be possible you got a bad thermostat? Unlikely but possible I guess.
I would know, a shop tried to blow my engine recently..
If its not the coolant it might be possible you got a bad thermostat? Unlikely but possible I guess.
It works every single time for me.
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Ive had the same problem for a while. Last week i replaced the thermostat and bled the coolant to remove bubbles. It turned out i was a little low on coolant so i refilled it with mostly water cus i ran out of coolant. It worked well for a while but know im getting the same problem. Im guessing ive got a coolant leak or something.
Check to see if youre car has a coolant leak.
Check to see if youre car has a coolant leak.
usually a hot condition in stop and go is usually the fans not coming on, or just one fan working. I would pull over once it gets passed the middle of the gauge and make sure the fans are on. (Check this first)
If the fans are good then we need to move onto replacing some things, like the rad cap and thermostat. I know you replaced the therm already, I just hope you didn't buy a ****, I mean Stant
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Try the fans first and report back and let us know.
If the fans are good then we need to move onto replacing some things, like the rad cap and thermostat. I know you replaced the therm already, I just hope you didn't buy a ****, I mean Stant
.Try the fans first and report back and let us know.
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Thread Starter
Teching In
Joined: Jul 2010
Posts: 43
Likes: 0
From: NC
okay so this morning I was on my way home from work. And my car does not over heat in the morning with stop and go traffic but only in the afternoon its wierd to me. im gonna go drive around and check to see if the fans are working right now.
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Verdad Gallardo Just remember that the fans dont kick in till very very late. I have the manual fan switch on mine, so i usually turn them on earlier, but my temp still rises with them off in a hot day or night.
Heres a link to the write up. Its real simple and you get full control of your fans. It should really help you out.
If you're installintg a fan switch to try to stay cool.....it means you have a problem with your cooling system. My 427ci stays way cool in 100* south Florida weather driving around all day with my A/C on.
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But youre right, the fan switch wont exactly fix your problem, it only helps in case of emergency.
Yeah, thats why im also trynna figure out what could be causing my problem. Ive already filled and bled my coolant, replaced my t-stat, and made sure my fans are working. Im not sure exactly what to do next. Maybe replace radiator cap
But youre right, the fan switch wont exactly fix your problem, it only helps in case of emergency.
But youre right, the fan switch wont exactly fix your problem, it only helps in case of emergency.
Put the cap back on.
Then stand there while it heats up. When you hear the fans come on, put your hand in front of each fan and make sure BOTH are running together. Then go turn on the A/C and/or stay there while it gets hotter and wait for BOTH fans to go into HIGH setting. Rule out a fan issue.
If both of those things check out.....good coolant flow and good fans, you either have
-a bad t-stat (even if its new)
-a very dirty condensor and air is not getting through
-slightly blown head gasket
-a bad temp sensor and you aren't really getting hot. Just need a new sensor. if you can keep your hand on your intake when it gets hot according to the guage, you're not really getting hot. When it gets to about 230* on the guage, you can't keep your hand on the intake without burning it for more than a few seconds.
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I had already done that when i replaced the t-stat. Except the only difference is that i left the new thermostat on while i added coolant/water. Im not sure if that makes a difference.
Also, the temp needle drops from around 240* back to around 190-200* whenever the car is accelerating. So, i guess this rules out a bad sensor or needle. (could be wrong though)
I should probably check to see if the condenser is clogged. Since im no good when it comes to ac components, the guy who checked my system told me it was ok, but i cant really trust him.
Since i have a small oil leak, my best bet would be a blown head gasket. I just didnt know this would cause a cars temp to rise.
Thanks for the help though.
Also, the temp needle drops from around 240* back to around 190-200* whenever the car is accelerating. So, i guess this rules out a bad sensor or needle. (could be wrong though)
I should probably check to see if the condenser is clogged. Since im no good when it comes to ac components, the guy who checked my system told me it was ok, but i cant really trust him.
Since i have a small oil leak, my best bet would be a blown head gasket. I just didnt know this would cause a cars temp to rise.
Thanks for the help though.
I had already done that when i replaced the t-stat. Except the only difference is that i left the new thermostat on while i added coolant/water. Im not sure if that makes a difference.
Also, the temp needle drops from around 240* back to around 190-200* whenever the car is accelerating. So, i guess this rules out a bad sensor or needle. (could be wrong though)
I should probably check to see if the condenser is clogged. Since im no good when it comes to ac components, the guy who checked my system told me it was ok, but i cant really trust him.
Since i have a small oil leak, my best bet would be a blown head gasket. I just didnt know this would cause a cars temp to rise.
Thanks for the help though.
Also, the temp needle drops from around 240* back to around 190-200* whenever the car is accelerating. So, i guess this rules out a bad sensor or needle. (could be wrong though)
I should probably check to see if the condenser is clogged. Since im no good when it comes to ac components, the guy who checked my system told me it was ok, but i cant really trust him.
Since i have a small oil leak, my best bet would be a blown head gasket. I just didnt know this would cause a cars temp to rise.
Thanks for the help though.
And when I say clogged a/c condensor.....I mean the outside of the condensor.
This is the cause of so many peoples overheating in the summer...a/c on or off....in city driving.
https://ls1tech.com/forums/general-m...irty+condensor
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ls6427, hey thanks for the link. Ill definately do that by the weekend. Im guessing this should also help my ac blow a little stronger right? Right now if its set on high, you can barely feel it. Hopefully i can kill 2 birds with one stone 
Yes, as soon as I cleaned mine the a/c blew WAY colder, like ice cold. Your engine will run ALOT cooler in the summer with the a/c on too.
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Last edited by LS6427; Jul 29, 2010 at 02:12 AM.
My 99 pre turbo and pre 408 swap overheated all of sudden on me. It turned out to be a plastic bag that was sucked up and between rad and condenser. Took out the bag and all was well again.