Overheating Issues
Thread Starter
Cruising
Joined: Jun 2009
Posts: 10
Likes: 0
Overheating Issues
I have a 1998 C5 that is experiencing extreme overheating issues. I started by replacing radiator cap, then thermostat and housing, today the radiator (old radiator had small leak up on to by outlet). It still overheats. The hose attached to the thermostat never did get hot. There appears to be no leaks. Is the next route to replace the water pump? PLEASE HELP!!!!!!
Racer
Joined: Jul 2010
Posts: 328
Likes: 0
From: Noblesville Indiana
I have a 1998 C5 that is experiencing extreme overheating issues. I started by replacing radiator cap, then thermostat and housing, today the radiator (old radiator had small leak up on to by outlet). It still overheats. The hose attached to the thermostat never did get hot. There appears to be no leaks. Is the next route to replace the water pump? PLEASE HELP!!!!!!
Tech Contributor
Joined: Dec 2006
Posts: 10,962
Likes: 28
From: Van Buren Arkansas
Wounded Warrior Escort '11
I don't think you have a water pump issue. Yes, insure there is no trapped air by following the burp procedure already provided to you. Next, check to see if your fans are actually running. You can do this simply by turning on the hvac to recirc with a cold temperature selected. Make sure both fans are running. Lastly, check for debris blocking the condensor. You may need to wash it or blow it out.
Thread Starter
Cruising
Joined: Jun 2009
Posts: 10
Likes: 0
still overheating
I did the burp, it didn't work. There is no water leaking or the traditional sound of a water pump comming apart. The lower hose attached to the thermostat housing was still cold with the engine overheating. Any additional suggestions would be appreciated.
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Le Mans Master
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Tech Contributor
Joined: Jan 2007
Posts: 19,116
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From: Dyer, IN
Burning Brakes
Joined: Mar 2002
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From: Atlanta Ga
Well from my perspective the process outlined by 8Vette7 which may be spot on has 16 steps according to his write-up. I was only thinking that changing the angles might simplify greatly the number of steps in the process, I know with my C4 it goes lke this
1 park it up hill, cap off
2 run to temp
3 fill to level, check level in radiator
4 replace cap
Just wondering if it could be simplified.
I'm leaving all the other things I wanted to say about the tone/comments of the previous post to myself. Just trying to be constructive!
1 park it up hill, cap off
2 run to temp
3 fill to level, check level in radiator
4 replace cap
Just wondering if it could be simplified.
I'm leaving all the other things I wanted to say about the tone/comments of the previous post to myself. Just trying to be constructive!
Tech Contributor
Joined: Jan 2007
Posts: 19,116
Likes: 1,038
From: Dyer, IN
Well from my perspective the process outlined by 8Vette7 which may be spot on has 16 steps according to his write-up. I was only thinking that changing the angles might simplify greatly the number of steps in the process, I know with my C4 it goes lke this
1 park it up hill, cap off
2 run to temp
3 fill to level, check level in radiator
4 replace cap
1 park it up hill, cap off
2 run to temp
3 fill to level, check level in radiator
4 replace cap
Tech Contributor
Joined: Jan 2007
Posts: 19,116
Likes: 1,038
From: Dyer, IN
Le Mans Master
Joined: Nov 2005
Posts: 6,993
Likes: 25
I've heard this wives tale for years, and often wondered where it came from. When they first fill the coolant at the factory, they don't elevate the nose of the car. When they service the cooling system at the dealer...they don't elevate the nose of the car. Somehow, the only people that have to elevate the nose of a corvette, when filling the cooling system, are the corvette owners. Coincidence?
This "Burping" procedure seems silly-I changed my coolant by draining and refilling and running with the tank open till it warmed up. As long as the overflow tank is above the radiator it should be simple. Many GM's I have owned or have now have a bleeder screw(s) for bleeding air out of the system (3.1, 3.4 and 3.8 liter engines)-the C5 didn't come with one-funny huh??Many people think the temps the C5 runs it too hot when compared with other cars-it was designed to run hotter (many discussions on this)-if both fans come on and the temp still stays above 190-200 for long periods MAYBE there is an issue but I think the OP has some other issue but I don't recall him saying what temps it's running and if the fans are coming on at the correct temps.
Last edited by dougbfresh; Mar 8, 2011 at 07:13 AM.