1985 Corvette coolant issue
Thread Starter
Heel & Toe
Joined: Jul 2017
Posts: 15
Likes: 0
1985 Corvette coolant issue
Hello, I have a 85 vette and I replaced a coolant line and the thermostat and have been trying to bleed the system of air. we have lifted the front end up to help and still wont regulate temp or blow hot air thru the vents. Im thinking water pump next but if anyone has any suggestions I would appreciate it! Thank you
Melting Slicks
Joined: Oct 2016
Posts: 2,024
Likes: 363
From: Central Alabama
When I did mine I started the fill with the bleed valve open and filled till coolant came out. Then I filled the system and ran it adding coolant as it burped out air.
I also use a Lisle-Spiil free funnel while burping.
Went through 3 cycles of bringing the engine to temp and cooling.
After it cooled, I topped up the tank and filled the overflow.
No problems since.
I also use a Lisle-Spiil free funnel while burping.
Went through 3 cycles of bringing the engine to temp and cooling.
After it cooled, I topped up the tank and filled the overflow.
No problems since.
Thread Starter
Heel & Toe
Joined: Jul 2017
Posts: 15
Likes: 0
When I did mine I started the fill with the bleed valve open and filled till coolant came out. Then I filled the system and ran it adding coolant as it burped out air.
I also use a Lisle-Spiil free funnel while burping.
Went through 3 cycles of bringing the engine to temp and cooling.
After it cooled, I topped up the tank and filled the overflow.
No problems since.
I also use a Lisle-Spiil free funnel while burping.
Went through 3 cycles of bringing the engine to temp and cooling.
After it cooled, I topped up the tank and filled the overflow.
No problems since.
Melting Slicks
Joined: May 2014
Posts: 2,890
Likes: 591
From: New Port Richey FL
Hello, I have a 85 vette and I replaced a coolant line and the thermostat and have been trying to bleed the system of air. we have lifted the front end up to help and still wont regulate temp or blow hot air thru the vents. Im thinking water pump next but if anyone has any suggestions I would appreciate it! Thank you
Melting Slicks
Joined: Oct 2016
Posts: 2,024
Likes: 363
From: Central Alabama
No it was sitting level in the driveway
S carter makes a good point about the heater valve it should be set to full hot during purging.
The funnel I mentioned allows the coolant to expand without boiling over. Once the engine cools you put the stopper in, remove the funnel and put it in the overflow tank. Pull the stopper and the extra is in the overflow.
S carter makes a good point about the heater valve it should be set to full hot during purging.
The funnel I mentioned allows the coolant to expand without boiling over. Once the engine cools you put the stopper in, remove the funnel and put it in the overflow tank. Pull the stopper and the extra is in the overflow.
Le Mans Master
Joined: Mar 2004
Posts: 5,107
Likes: 171
From: Dublin CA
As a note, the 85 coolant system doesn't have bleeder screws like some of the newer C4's. It helps if you drill a 1/16" hole in the frame of the thermostat and align this hole to the front of the car. You will bleed the system better if you elevate the front end 12-18" off the ground. It may take a couple of heat cycles to accomplish this.
