LT1 Cooling system woes
Thread Starter
Instructor
Joined: May 2002
Posts: 105
Likes: 18
From: Trabuco Canyon CA
LT1 Cooling system woes
I am having an issue with the car overheating.
Recently went through the cooling system and replaced the rad / hoses / thermostat. System was working perfectly after this upgrade.
Went to change the waterpump (working fine, just a preventative maintenance issue since I was into the cooling system) and since the second round of maintenance, have been having overheating issues. I also have noted that no matter what, the HVAC system will not heat the car and that when the system gets to overheating, there is something rattling in the black container until the system cools down.
Things that have changed since the initial replacement. While I was changing out the waterpump, I also cleaned out the 2 containers (black up top and clear below).
Barring the obvious (new thermostat sticking closed), might I have gotten the 2 larger hoses on the black container on backwards? Right now the top goes to the firewall and the bottom goes to the waterpump.
Thanks ahead. Scott
Recently went through the cooling system and replaced the rad / hoses / thermostat. System was working perfectly after this upgrade.
Went to change the waterpump (working fine, just a preventative maintenance issue since I was into the cooling system) and since the second round of maintenance, have been having overheating issues. I also have noted that no matter what, the HVAC system will not heat the car and that when the system gets to overheating, there is something rattling in the black container until the system cools down.
Things that have changed since the initial replacement. While I was changing out the waterpump, I also cleaned out the 2 containers (black up top and clear below).
Barring the obvious (new thermostat sticking closed), might I have gotten the 2 larger hoses on the black container on backwards? Right now the top goes to the firewall and the bottom goes to the waterpump.
Thanks ahead. Scott
Race Director
Joined: Apr 2000
Posts: 15,344
Likes: 4,009
From: Texas
Re: LT1 Cooling system woes (rxalot)
Are you absolutely certain you reinstalled the plastic coupler between the water pump and the water pump driveshaft that pokes thru the timing chain cover? Sounds like the water pump isn’t pumping.
Race Director
Joined: Feb 2003
Posts: 11,671
Likes: 20
From: Lake Wylie SC
Re: LT1 Cooling system woes (rxalot)
I wish we could have talked to you before replacing that OEM style pump. Electric water pumps are the way to go. BTW, I hope you didn't put a rebuilt pump in, they have a bad history with LT1s.
Thread Starter
Instructor
Joined: May 2002
Posts: 105
Likes: 18
From: Trabuco Canyon CA
Re: LT1 Cooling system woes (Strick)
I have burped the system. I will check the coupler. It was on the cam drive side when I installed the pump but...
I purchased a rebuilt but am sending it back because one of the inlets was the wrong configuration, so the original is currently back in.
I had toyed with electric but I am in a time crunch and the whole dropping the oil pan to remove the drive and plug the hole and the necessary electrical would be something I need more than a weekend to do. Maybe next year.
Will let you know. Scott
I purchased a rebuilt but am sending it back because one of the inlets was the wrong configuration, so the original is currently back in.
I had toyed with electric but I am in a time crunch and the whole dropping the oil pan to remove the drive and plug the hole and the necessary electrical would be something I need more than a weekend to do. Maybe next year.
Will let you know. Scott
Race Director
Joined: Feb 2003
Posts: 11,671
Likes: 20
From: Lake Wylie SC
Re: LT1 Cooling system woes (rxalot)
If you do get the urge to go electric, look under Tech Tips for "Meziere Coolant Pump install"
https://www.corvetteforum.com/techti...=231&TopicID=2
[Modified by Strick, 9:57 PM 3/2/2004]
https://www.corvetteforum.com/techti...=231&TopicID=2
[Modified by Strick, 9:57 PM 3/2/2004]
Le Mans Master
Joined: Jun 1999
Posts: 6,272
Likes: 2
From: Chino Valley AZ
Cruise-In I Veteran
Cruise-In II Veteran
Currently Corvette-less
Re: LT1 Cooling system woes (96GS#007)
Are you absolutely certain you reinstalled the plastic coupler between the water pump and the water pump driveshaft that pokes thru the timing chain cover? Sounds like the water pump isn’t pumping.
Those of you who have been around for a few years might remember that I forgot to install the coupler when I changed pumps. As you might expect, I took a lot of grief over that one......:yesnod:
~ Purp
[Modified by PurpleC4, 8:49 PM 3/2/2004]
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Thread Starter
Instructor
Joined: May 2002
Posts: 105
Likes: 18
From: Trabuco Canyon CA
Re: LT1 Cooling system woes (PurpleC4)
All right, you got me. Egg on my face.
Certain enough, I looked at the pump I was going to return and the coupler (although metal vice plastic) was still on it.
Got it back together and will check it out tomorrow.
Thanks all.
Certain enough, I looked at the pump I was going to return and the coupler (although metal vice plastic) was still on it.
Got it back together and will check it out tomorrow.
Thanks all.
