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tadge , rick here I'm a new member here as of today and I'm having an over heating problem with my 85 it seems the faster I go the hotter it runs but as soon as I let off the gas and start slowing down it cools rite off the fans are working and I put a new thermos stat in a 190 degree . there are no leaks anywere and I'm not losing any fluid . here were I live I cant seem to find anyone interested in looking at it let alone work on it . so I was wondering if this may be something you might be able to trouble shoot for me so I have some direction on what to do or what to look for . I would be great full for any advice you might have
sincerely rick
What are the temps you see displayed? It's not unusual for coolant temps to be in the 200 degree range. C4's are designed to run at higher temps in order to help with emissions.
Definitely check for dirt and debris by loking up under the nose of the car. C4's are sometimes called "bottom breathers" in that air for cooling comes up from the bottom of the car. Also make sure that the 3 pieces of the air dam are in place and in good condition. They serve to direct air up into the radiator and A/C condenser.
What are the temps you see displayed? It's not unusual for coolant temps to be in the 200 degree range. C4's are designed to run at higher temps in order to help with emissions.
Definitely check for dirt and debris by loking up under the nose of the car. C4's are sometimes called "bottom breathers" in that air for cooling comes up from the bottom of the car. Also make sure that the 3 pieces of the air dam are in place and in good condition. They serve to direct air up into the radiator and A/C condenser.
I don't know if your year has the digital gage for the water temp. If it does always use the digital gage as the other gage is always off
Check for debris in front of the radiator. You have to remove the plastic shield that is over the top of the radiator.....not at all difficult. When was the last time the block was flushed? To do this you have to pull the knock sensor on the passenger side of the block and remove the plug on the driver's side and flush the block thoroughly.
The last time you filled the radiator did you jack up the front end to "burp" the system? A air bubble in the system will play havoc with temperatures. One thing that will help burp they system is to drill a 1/16" hole in the thermostat fixed housing. Then install the thermostat with the hole at the located to the front of the engine. This will allow air to bleed thru the hole when the front of the car is jacked up.
As noted above, these cars will run hot in the 220-230 range. To help keep this running cooler, change the thermostat to a 160 degree. Consider changing the waterpump to a high flow pump such as the FlowKooler will also help keep the temperature down.
As noted above, these cars will run hot in the 220-230 range. To help keep this running cooler, change the thermostat to a 160 degree. Consider changing the waterpump to a high flow pump such as the FlowKooler will also help keep the temperature down.
If your car is running at 220-230°, changing the thermostat will do nothing. The thermostat sets the MINIMUM temperature. The running temperature is determined by how well the cooling system is working and how much load is on the engine.
Note that 220-230° is NORMAL. If it gets over 250° you need to fix something.
From: Clifton Park, NY ............Clearwater, FL ... 85 Original Owner
Originally Posted by rocketrick
tadge , rick here I'm a new member here as of today and I'm having an over heating problem with my 85 it seems the faster I go the hotter it runs but as soon as I let off the gas and start slowing down it cools rite off the fans are working and I put a new thermos stat in a 190 degree . there are no leaks anywere and I'm not losing any fluid . here were I live I cant seem to find anyone interested in looking at it let alone work on it . so I was wondering if this may be something you might be able to trouble shoot for me so I have some direction on what to do or what to look for . I would be great full for any advice you might have
sincerely rick
As others have said, make sure your radiator is free of debris. The best way to clean it is to take it out. Here's what I'm sure yours looks like if it's never been cleaned.
thank you all so much for the quick reply ! and I will surely look at these ideas . what's going on is the faster I wanna go the hotter it wants to run . if I get near 75 or 80 its up over 250 but as soon as I let off the gas and slow down the temp drops rite off like nothin
St. Jude Donor '06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16
Check for debris in front of the radiator. You have to remove the plastic shield that is over the top of the radiator.....not at all difficult.
Here is the junk and debris that was between the AC condenser and my 87's radiator. After I cleaned it out I took a trip to Chicago from Michigan and was stuck in traffic around Gary, IN. I moved only 300' in an hour on a humid 80 something day with no overheating problems at all.
From: Freedom is never more than one generation away from extinction.
St. Jude '03 thru '24
Thinking back on some heating problems I've seen.
You need to service your system. Completely. Pull the block drains too.
Pull the radiator, clear debris from the radiator and condenser.
Flush the cooling and heater systems
Replace the t-stat with a new Stant.
Fill with the green stuff and burp until full.
Check for debris in front of the radiator. You have to remove the plastic shield that is over the top of the radiator.....not at all difficult. When was the last time the block was flushed? To do this you have to pull the knock sensor on the passenger side of the block and remove the plug on the driver's side and flush the block thoroughly.
The last time you filled the radiator did you jack up the front end to "burp" the system? A air bubble in the system will play havoc with temperatures. One thing that will help burp they system is to drill a 1/16" hole in the thermostat fixed housing. Then install the thermostat with the hole at the located to the front of the engine. This will allow air to bleed thru the hole when the front of the car is jacked up.
As noted above, these cars will run hot in the 220-230 range. To help keep this running cooler, change the thermostat to a 160 degree. Consider changing the waterpump to a high flow pump such as the FlowKooler will also help keep the temperature down.
Ok I'm having a over heating problem.
One day don't really have problem
next day it will go 220 and keep climbing I have think 195 thermostat
I'm getting to end of my rope days it runs perfect 205 and less
any ideas
o we did before put thermostat in run water through heater core radiator and block
need help
Ok I'm having a over heating problem.
One day don't really have problem
next day it will go 220 and keep climbing I have think 195 thermostat
I'm getting to end of my rope days it runs perfect 205 and less
any ideas
o we did before put thermostat in run water through heater core radiator and block
need help
First what year Vette do you have? As mentioned by many in the above posts check for debris in front of your radiator - one of the biggest problems. If you have a LT1 engine, it takes a 180 stat .L98 I believe takes a 195 stat . Make sure it is the correct thermostat for your car made for corvettes.( LT1 has a reverse flow system) Complete flush of system including the knock sensors. If the radiator is original you may want to invest in a new one. Try turning on the A/C and see if it cools down. If you are in traffic then 220 is normal. If you are on the highway it is not normal. Check to see if the fans are running when the a/c is on. Depending on the year the fans turn on around 228. Don't forget to get rid of any air pockets in the radiator
Let us know your findings
Opps
it's a 84corvette when first got the car we pulled thermostat
ran water through top of motor out through bottom hose.
also ran water through radiator and heater core.
I just replace cooling fan sensor on passenger side of motor.
Water flowed good out hole.
I'm trying to figure out how to put antifreeze and water in and thermostat.
tomorrow.
My vette does not here any of the piping on passenger side
has a heater hose goes from water pump to heater core then from heater
core to motor.
Opps
it's a 84corvette when first got the car we pulled thermostat
ran water through top of motor out through bottom hose.
also ran water through radiator and heater core.
I just replace cooling fan sensor on passenger side of motor.
Water flowed good out hole.
I'm trying to figure out how to put antifreeze and water in and thermostat.
tomorrow.
My vette does not here any of the piping on passenger side
has a heater hose goes from water pump to heater core then from heater
core to motor.
No debris in radiator
Don't forget to "burp" the system as air pockets will have an affect on the temps. This is very important. I am not familiar with the 84. In my 95 I have to use a thermostat specifically made for my year corvette because of the reverse flow. I do not know if that applies on your 84. Some others should chime in that will be more familiar with the 84.
Good luck
ok I just cleaned out some debris between my radiator n condenser there was some leaves and even a couple pieces of plastic and some debris stuck to the radiator as well I removed everything and brushed of the front put it all back together and felt pretty good about it . then took it for a test drive and there was no change in fact it almost seemed to get hoter quicker . surely don't understand what's going on . when I pulled in I popped the hood and felt the radiator cap and it was only warm to the touch there were no leaks the hoses were only warm to the touch , no leaks around the valve covers the fan was working fine and it was just sitting there idling at 139 140 . last fall I put a new thermostat in that was a 194 degree . if it is possible that it needs burped how is that done ? so frustrating
From: Clifton Park, NY ............Clearwater, FL ... 85 Original Owner
Originally Posted by rocketrick
ok I just cleaned out some debris between my radiator n condenser there was some leaves and even a couple pieces of plastic and some debris stuck to the radiator as well I removed everything and brushed of the front put it all back together and felt pretty good about it . then took it for a test drive and there was no change in fact it almost seemed to get hoter quicker . surely don't understand what's going on . when I pulled in I popped the hood and felt the radiator cap and it was only warm to the touch there were no leaks the hoses were only warm to the touch , no leaks around the valve covers the fan was working fine and it was just sitting there idling at 139 140 . last fall I put a new thermostat in that was a 194 degree . if it is possible that it needs burped how is that done ? so frustrating
If you didn't take the radiator out and spray through the fins, it's likely still full of crud
overheating
I'm sure many others will chime in with more suggestions that's just how it works here 
Check for debris in front of the radiator. You have to remove the plastic shield that is over the top of the radiator.....not at all difficult. When was the last time the block was flushed? To do this you have to pull the knock sensor on the passenger side of the block and remove the plug on the driver's side and flush the block thoroughly.
