Leaking coolant - 2002 Chevrolet Avalanche

Coolant have colour just for this same thing so that you can see where it is leaking. I use green colour coolant which is most common and when I need to find a very minor leak (major ones are visible as green crystalline deposits) normally I use UV light. Under UV light the coolant shows florescence.


Other things to check in such cases are:
Radiator cap and Coolant valve which often get choked and do not open resulting in over heating of engine.

Get the coolant pressure tested, its definitely leaking coolant. You will need to get the coolant running line.

Pressure test will help you to know from where exactly coolant/refrigerant is getting leaked.

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For complete step by step troubleshooting i suggest you to go through the help link mentioned below :----
Click the link below: -----

COOLANT LEAK ISSUES, COOLANT LEAK PROBLEMS, COOLANT SENSOR, LOW COOLANT,
http://alltypesofpartsreplacing.blogspot.com/2012/12/coolant-leak-issues-coolant-leak.html

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These will help.
Thanks.

Is it water or engine coolant leaking? Check the coolant level and see if its low. If the coolant level is low...the coolant system will need to be pressure tested and leak pinpointed. If you sure its water...I would look at the black windshield cowl. This cowl channel's away water and could be leaking on the motor. There is windshield washer hoses in the cowl that could be leaking. Good Luck

Vehicles: Any with the above symptoms

A cracked cylinder block will cause either:
(a) motor oil contamination of engine coolant
(b) coolant contamination of motor oil
(c) white exhaust smoke, due to coolant seeping into one or more cylinders.
(d) more than one of the above
(e) all of the above

Oil infiltrating into coolant is easy to see - drain some coolant out through the pepcock at the bottom of the radiator, and place it into a styrofoam coffee cup. Oil droplets floating on top of the green (or orange) coolant are easily seen. Or visualize oil by looking into the top of the radiator through the radiator cap.
Coolant infiltrating into and mixing with motor oil will permanently damage the engine (seizing it up through loss of lubrication), and must be prevented.
A leak from above the front suspension is, as physicians like to put it, "nonspecific", with the most likely cause a water pump seal or hose/hose connection.
A leak from near the fire wall will usually be a heater core hose, or hose connection.
A coolant leak on the same side of the engine as the water pump is a leaking water pump or water pump seal until proven otherwise.

To rule out everythng else, here's the 1999 Honda CR-V Troubleshooting Guide for Coolant Loss/Coolant Leaking:

Priority Action Part Type Cause
1 Inspect Water Pump - Worn, Cracked or Leaking Water Pump, or Water Pump gasket.
2 Inspect Head Gasket - Leaking Head Gasket.
3 Inspect Radiator - Leaking Radiator Hose(s).
4 Inspect Radiator Cap - Worn or Damaged Radiator Cap.
5 Inspect Radiator Hose - Ruptured, Cracked or Leaking Radiator Hose.
6 Inspect Freeze Plug - Leaking Freeze Plug(s).
7 Inspect Intake Manifold Gasket - Leaking, Worn, or Damaged Intake Manifold Gasket.
8 Inspect Water Outlet - Cracked, Leaking or Damaged Water Outlet.
9 Inspect Heater Control Valve - Leaking or Faulty Heater Control Valve.
10 Inspect Radiator Drain Pepcock - Loose, Damaged, or Faulty Radiator Drain Pepcock, or Pepcock O-ring.
11 Inspect Engine (DOMESTIC ONLY) - Cracked Cylinder Block Leaking Coolant into at least one Cylinder, causing white exhaust smoke.

Maybe the coolant is leaking into a cylinder, slowly and also leaking out of the head gasket to the atmosphere when running under the increased load of the a/c.

If having to add coolant regularly, you're right, it must be leaking somewhere. It could be leaking out onto a hot part of the exhaust so look around there.

Hi:
If all of your coolant is leaking out in 5 minutes, you should get that fixed before you drive it much, as you are risking severe damage to the engine if it overheats. Since you see coolant leaking onto the ground, the first step is to narrow down the source of the leak. Basically all you have is the radiator, the hoses, and the engine. If the radiator or hoses are the source of the leak, all that needs to be done is to replace the leaking part. if it is leaking from the engine, the most likely part is the waterpump, which is a bit more compicated to change.

Hopefully you can get some eyes on the car after it is filled up with coolant, and narrow down the cause of your leak!

if there are no visible leaks ending up on the ground, check the engine oil level and see if it is overfilled or looks like there is coolant on the dipstick, could either be a head or intake gasket leaking coolant into the engine. Also check for white smoke coming from the exhaust which shows that the engine is burning coolant. If the engine has overheated recently there is a good chance that you have a cracked head and coolant is leaking internally in the engine

Where is the coolant coming from? It could just be a bad hose, or radiator, or heater core, of even water pump. need more info.

Highly unlikely that is the case more likely it is the radiator leaking onto the fan. Also check the upper hose to make sure that it doesnt have a pin hole in it. Good luck and dont forget to rate.

1 Inspect Oil Pan Gasket - Performance Ruptured, cracked or leaking radiator hose. 2 Inspect Hose (Bypass) Ruptured, cracked or leaking bypass hose. 3 Inspect Hose (Heater) Ruptured, cracked or leaking heater hose. 4 Inspect Radiator Cap Worn or damaged radiator cap 5 Inspect Heater Core Heater core may be leaking antifreeze/coolant into the vehicle`s floor area. 6 Inspect Heater Control Valve Leaking or defective heater control valve. 7 Inspect Radiator Drain Plug Loose, damaged, or faulty radiator drain plug. 8 Inspect Radiator Rusted, corroded, or damaged radiator may be leaking antifreeze/coolant 9 Inspect Water Pump Damaged, worn or leaking water pump. 10 Inspect Cooling System Mix Coolant level low or flow is restricted. 11 Inspect Head Gasket - Performance Blown head gasket 12 Inspect Hood Brace Leaking, worn, or damaged intake manifold gasket 13 Inspect Freeze Plug Freeze plugs are cracked or leaking.