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98' Overheating Issue...

sigepsmup

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sigepsmup New Member

sigepsmup

Posted
Posted

Hi, First post ever.

 

I have a 1998 Silverado 1500 that has been experiencing some overheating problems. For the past five or so months I've been tinkering with the truck..and still have yet to find a solution.

 

I replaced the radiator, thermostat, and can't find a leak..but the coolant is disapearing. I ve also checked the sparkpulgs and everything seem to be fine. After a 20 min night drive I lose about 1/2 a gallon of coolant. Other than this the truck runs fine...good idle.

 

Any sugestions...

Daryl LBZ Senior Enthusiast

Daryl LBZ

Posted
Posted
Hi, First post ever.

 

I have a 1998 Silverado 1500 that has been experiencing some overheating problems. For the past five or so months I've been tinkering with the truck..and still have yet to find a solution.

 

I replaced the radiator, thermostat, and can't find a leak..but the coolant is disapearing. I ve also checked the sparkpulgs and everything seem to be fine. After a 20 min night drive I lose about 1/2 a gallon of coolant. Other than this the truck runs fine...good idle.

 

Any sugestions...

 

 

 

 

Have you checked the waterpump and hoses?

rodram Enthusiast

rodram

Posted
Posted

yup.... when a head gasket is leaking your coolant can leak into the exhaust ... OR it can leak into your cylinders and contaminate your oil.

 

likely you have an exhaust to coolant head gasket leak ... after a few minutes of driving your exhaust will begin to leak into your coolant and quickly overheat the cooling system ...

 

the BIG RISK of course is that you might leak coolant into your oil ... is your oil brown and white streaked like a milkshake ? ... if any indication of this then DO NOT start the engine .. driving with contaminated oil like this will toast your bearings and crankshaft VERY quickly .....

 

.. or if your head gasket is OK then you might be losing coolant through a leaky intake manifold gasket ... if this is the case then the coolant will end up sitting/collecting on the top of your engine and will evaporate as your drive ... you will also likely be able to smell coolant when your engine is warm and you are standing beside the truck.

sigepsmup New Member

sigepsmup

Posted
  • Author
Posted

I dont think a blown head gasket is my problem. My oil is fine and i have absolutly no smell or smoke from the exhaust...I dont know what else to look at...

txab Senior Enthusiast

txab

Posted
Posted

Pressurize your system to look for leaks. you can add an appropriate dye to the coolant to aid in finding leaks with a black light.

 

You've basically told us everything that could cause a leak is "fine". This can't be the case if you lose 1/2 gallon in 20 minutes. You're either spewing it out or your burning it. Everything is in play until you find the actual leak.

 

You can test coolant for traces of combustion matter.

98trck Enthusiast

98trck

Posted
Posted

this is how i have diagnosed more then one blown head gasket

when engine is cold, remove radiator cap, start engine, watch coolant for bubbles

green 788 Enthusiast

green 788

Posted
Posted

pull your spark plug and smell it... if it smells like coolant, that's a head gasket. or have someone drive behind you and see if there's an anti-freeze smell.

 

if you're using anti-freeze, and it's not leaking on the ground, the only place it could be going is into the crank case or out the tail pipe. still sounds like a head gasket.

dsr611 Senior Enthusiast

dsr611

Posted
Posted

When I had my 98 Sierra, I had an issue with a coolant leak not too long after I got it. Took it to the dealer and they checked it over and found a "heater hose quick-connect" that was corroded and leaking. If I remember correctly, the leak was caused by a galvanic reaction between the 2 different metal components. Check the following 2 links for more information on it

 

 

 

 

1998 Tahoe 6.5TD Heater Hose Quick-Connect Leak

Heater Hose Quick Disconnect Replacement Tutorial

Graya25 Enthusiast

Graya25

Posted
Posted

I know I'm late to this discussion, but have you checked the quick connect on the heater hose connecting to the intake manifold? That is NOTORIOUS for leaking and also snapping off in the intake manifold if you try to remove it. Mine was leaking and, as bad as it sounds, is glued to prevent any further leakage, which has worked well so far. I have the new part, I just really don't want to spend a week trying to extract a broken quick connect from the intake manifold and bore a new hole.

  • 2 weeks later...
atsbob Enthusiast

atsbob

Posted
Posted

Mine never overheated but went through lots of coolant and it was the intake gaskets. My oil allways looked good but would lose about a gallon every two months. Lots of these Vortex 96-98 had this issue.

  • 2 weeks later...
JBarnhouse New Member

JBarnhouse

Posted
Posted

Luis, I'm having the exact same problem with my 98 Silverado...losing coolant somewhere but the truck starts fine and runs as well as it ever has. Definitely no direct evidence of a leak anywhere but the coolant has to be going somewhere. I am going to try some of the recommendations that people have mentioned in this forum. Will keep you posted if I find it.

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