No "Low Coolant" Light ???!!!
Thread Starter
Le Mans Master
Joined: Oct 2003
Posts: 7,625
Likes: 4
From: Director of Bands
St. Jude Donor '08
No "Low Coolant" Light ???!!!
And here I thought I refilled the cooling system perfrctly. Turns out that my "Low Coolant" light doesn't even turn one at the ignition check up!!! I am trying to look it up in my Helms, but it's a little like finding a needle in a haystack for me. Any ideas????
TIA,
Ed
TIA,
Ed
Thread Starter
Le Mans Master
Joined: Oct 2003
Posts: 7,625
Likes: 4
From: Director of Bands
St. Jude Donor '08
Is this a big deal?
I have a driving event on Friday... my temps are at 201 at cruise. If I burp the system, should I even worry about not having a "low coolant" light?
I'm really kinda worried about this, as I gotta have the car ready to go by tomorrow night
Any ideas?
TIA!
Ed
I'm really kinda worried about this, as I gotta have the car ready to go by tomorrow night
Any ideas?
TIA!
Ed
Team Owner
Joined: Dec 1999
Posts: 34,873
Likes: 487
From: Lacey WA RVN 68-69
NCM Sinkhole Donor
If the Low Coolant light doesn't come on when you turn the ignition key to run, it's going to be either the bulb in the DIC or the sensor in the expansion tank.
As long as the coolant level in the tank is just below the lip where the gasket on the cap sits and there are no leaks in the cooling system, you should be OK in terms of the system operating properly. 201 degrees is OK at cruise but keep the temp display up and watch for wide swings. Check the radiator and A/C condensor for dirt and debris and flush them out with a stream of water going from the engine side of the radiator through the fan shroud.
The sensor is part of the expansion tank and is not servicable by itself; you have to replace the whole tank. When you have time, you should check the bulb in the DIC.
As long as the coolant level in the tank is just below the lip where the gasket on the cap sits and there are no leaks in the cooling system, you should be OK in terms of the system operating properly. 201 degrees is OK at cruise but keep the temp display up and watch for wide swings. Check the radiator and A/C condensor for dirt and debris and flush them out with a stream of water going from the engine side of the radiator through the fan shroud.
The sensor is part of the expansion tank and is not servicable by itself; you have to replace the whole tank. When you have time, you should check the bulb in the DIC.
Drifting
Joined: Oct 2003
Posts: 1,594
Likes: 0
From: CALGARY ab
Originally Posted by c4cruiser
If the Low Coolant light doesn't come on when you turn the ignition key to run, it's going to be either the bulb in the DIC or the sensor in the expansion tank.
As long as the coolant level in the tank is just below the lip where the gasket on the cap sits and there are no leaks in the cooling system, you should be OK in terms of the system operating properly. 201 degrees is OK at cruise but keep the temp display up and watch for wide swings. Check the radiator and A/C condensor for dirt and debris and flush them out with a stream of water going from the engine side of the radiator through the fan shroud.
The sensor is part of the expansion tank and is not servicable by itself; you have to replace the whole tank. When you have time, you should check the bulb in the DIC.
As long as the coolant level in the tank is just below the lip where the gasket on the cap sits and there are no leaks in the cooling system, you should be OK in terms of the system operating properly. 201 degrees is OK at cruise but keep the temp display up and watch for wide swings. Check the radiator and A/C condensor for dirt and debris and flush them out with a stream of water going from the engine side of the radiator through the fan shroud.
The sensor is part of the expansion tank and is not servicable by itself; you have to replace the whole tank. When you have time, you should check the bulb in the DIC.
Thread Starter
Le Mans Master
Joined: Oct 2003
Posts: 7,625
Likes: 4
From: Director of Bands
St. Jude Donor '08
Yeah, but I have an LT1
I was doing some research on the CAC site, and there was a thread regarding the "low coolant" indicator on start up. Some say that it shouldn't light up at start up, that it should only light up if there is a problem. What's the consensus of the LT1 folks here?
http://corvetteactioncenter.com/foru...ht=low+coolant
http://corvetteactioncenter.com/foru...ht=low+coolant
????????
http://corvetteactioncenter.com/foru...ht=low+coolant
http://corvetteactioncenter.com/foru...ht=low+coolant
????????
Melting Slicks
Joined: Aug 1999
Posts: 2,240
Likes: 42
From: Baltimore, MD USA
For 90-96 Vettes, they used a Low Coolant Switch mounted in/under the black plastic fill tank.
No bulb test is done when you turn the ignition on.
One side of the (Low Coolant light bulb) goes to 12 volts. The other side of the light bulb get's grounded when the Low Coolant Switch shorts out. (When coolant doesn't cover it) so the Low Coolant light turns on.
If you want to test the light bulb in the DIC, unplug the connector and take a paper clip and short the two wires on the plug. Turn the ignition to Run and the light should be on.
There was a bulb test (Low Coolant) for 89 and older C4's.
They used a 1 wire sensor mounted in the radiator on the passenger side. The sensor then went to a Low Coolant Module which controlled the Low Coolant light.
No bulb test is done when you turn the ignition on.
One side of the (Low Coolant light bulb) goes to 12 volts. The other side of the light bulb get's grounded when the Low Coolant Switch shorts out. (When coolant doesn't cover it) so the Low Coolant light turns on.
If you want to test the light bulb in the DIC, unplug the connector and take a paper clip and short the two wires on the plug. Turn the ignition to Run and the light should be on.
There was a bulb test (Low Coolant) for 89 and older C4's.
They used a 1 wire sensor mounted in the radiator on the passenger side. The sensor then went to a Low Coolant Module which controlled the Low Coolant light.
Thread Starter
Le Mans Master
Joined: Oct 2003
Posts: 7,625
Likes: 4
From: Director of Bands
St. Jude Donor '08
Originally Posted by Hooked on Vettes
For 90-96 Vettes, they used a Low Coolant Switch mounted in/under the black plastic fill tank.
No bulb test is done when you turn the ignition on.
One side of the (Low Coolant light bulb) goes to 12 volts. The other side of the light bulb get's grounded when the Low Coolant Switch shorts out. (When coolant doesn't cover it) so the Low Coolant light turns on.
If you want to test the light bulb in the DIC, unplug the connector and take a paper clip and short the two wires on the plug. Turn the ignition to Run and the light should be on.
There was a bulb test (Low Coolant) for 89 and older C4's.
They used a 1 wire sensor mounted in the radiator on the passenger side. The sensor then went to a Low Coolant Module which controlled the Low Coolant light.
No bulb test is done when you turn the ignition on.
One side of the (Low Coolant light bulb) goes to 12 volts. The other side of the light bulb get's grounded when the Low Coolant Switch shorts out. (When coolant doesn't cover it) so the Low Coolant light turns on.
If you want to test the light bulb in the DIC, unplug the connector and take a paper clip and short the two wires on the plug. Turn the ignition to Run and the light should be on.
There was a bulb test (Low Coolant) for 89 and older C4's.
They used a 1 wire sensor mounted in the radiator on the passenger side. The sensor then went to a Low Coolant Module which controlled the Low Coolant light.
Melting Slicks
Joined: Aug 1999
Posts: 2,240
Likes: 42
From: Baltimore, MD USA
The bulbs for the DIC are mounted on a socket holders.
The bulb is a type 74
To replace a bulb note its position on the silk screen.
Disconnect the negative battery cable.
1) Open center console lid and lift up the felt at the front of each corner. There will be two hidden bolts you need to remove.
2) Close the lid and open the ash tray lid. Remove the ash tray cups. Under one of them will be a bolt you need to remove.
3) Place a towel on the center console lid so you don't scratch it up and lift up on the shifter bezel and pull back so you gain access to remove the bolts holding the radio trim bezel.
4) Remove the bolts holding the radio trim bezel and pull it straight back.
5) Remove the bolts holding the DIC to the dash.
Unplug the connectors. Look at the back of the DIC and you'll see the socket holders for the bulbs. Give the holder a slight twist and the socket will come out.
Replace the bad bulb and reassemble everything.
The bulb is a type 74
To replace a bulb note its position on the silk screen.
Disconnect the negative battery cable.
1) Open center console lid and lift up the felt at the front of each corner. There will be two hidden bolts you need to remove.
2) Close the lid and open the ash tray lid. Remove the ash tray cups. Under one of them will be a bolt you need to remove.
3) Place a towel on the center console lid so you don't scratch it up and lift up on the shifter bezel and pull back so you gain access to remove the bolts holding the radio trim bezel.
4) Remove the bolts holding the radio trim bezel and pull it straight back.
5) Remove the bolts holding the DIC to the dash.
Unplug the connectors. Look at the back of the DIC and you'll see the socket holders for the bulbs. Give the holder a slight twist and the socket will come out.
Replace the bad bulb and reassemble everything.
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Thread Starter
Le Mans Master
Joined: Oct 2003
Posts: 7,625
Likes: 4
From: Director of Bands
St. Jude Donor '08
Originally Posted by Hooked on Vettes
The bulbs for the DIC are mounted on a socket holders.
The bulb is a type 74
To replace a bulb note its position on the silk screen.
Disconnect the negative battery cable.
1) Open center console lid and lift up the felt at the front of each corner. There will be two hidden bolts you need to remove.
2) Close the lid and open the ash tray lid. Remove the ash tray cups. Under one of them will be a bolt you need to remove.
3) Place a towel on the center console lid so you don't scratch it up and lift up on the shifter bezel and pull back so you gain access to remove the bolts holding the radio trim bezel.
4) Remove the bolts holding the radio trim bezel and pull it straight back.
5) Remove the bolts holding the DIC to the dash.
Unplug the connectors. Look at the back of the DIC and you'll see the socket holders for the bulbs. Give the holder a slight twist and the socket will come out.
Replace the bad bulb and reassemble everything.
The bulb is a type 74
To replace a bulb note its position on the silk screen.
Disconnect the negative battery cable.
1) Open center console lid and lift up the felt at the front of each corner. There will be two hidden bolts you need to remove.
2) Close the lid and open the ash tray lid. Remove the ash tray cups. Under one of them will be a bolt you need to remove.
3) Place a towel on the center console lid so you don't scratch it up and lift up on the shifter bezel and pull back so you gain access to remove the bolts holding the radio trim bezel.
4) Remove the bolts holding the radio trim bezel and pull it straight back.
5) Remove the bolts holding the DIC to the dash.
Unplug the connectors. Look at the back of the DIC and you'll see the socket holders for the bulbs. Give the holder a slight twist and the socket will come out.
Replace the bad bulb and reassemble everything.
