roadtrippin Posted September 28, 2008 Share Posted September 28, 2008 Simple: Run A/c or Defrost coolant disappears from overflow tank (no more than a 1/4 cup). Doesnt happen any other time. No symptoms of leaks, just loss from tank. Causes? History:New water pump, thermostat, rad, rad cap, hoses all done at subbie shop within last 10k. I almost want to think air in the system but Im not sure, because afaik when there is air in the system it usually runs hotter than normal, which in my case it isnt doing. The needle stays pegged right in the mid. Again there is NO visible leaks, no oil in coolant or coolant in oil....just a small loss from the overflow tank. Ideas....where to start? Quote Link to comment Share on other sites More sharing options...
lostinthe202 Posted September 28, 2008 Share Posted September 28, 2008 Ideas....where to start? Lets start with: Car type Engine type Odometer reading Quote Link to comment Share on other sites More sharing options...
forester2002s Posted September 28, 2008 Share Posted September 28, 2008 Question: Are you saying that you lose 1/4 cup of coolant from the overflow tank EACH TIME that you use the AC? And that it doesn't return to the tank later? If that is the case, then you are actually losing coolant somewhere. However, if the level of coolant returns to normal later, then this is nothing to be concerned about. Please clarify. Quote Link to comment Share on other sites More sharing options...
Buick350X Posted September 29, 2008 Share Posted September 29, 2008 Our Forest did something similar for a bit, coolent just went MIA. Put some stop leak in it a few times and it went away. Quote Link to comment Share on other sites More sharing options...
mdjdc Posted September 29, 2008 Share Posted September 29, 2008 DO NOT, DO NOT just put in some stop leak. It cause more problems than it ever fixed. Find the cause of the loss of coolant and fix it. There has to be a loss somewhere and it can be found. Smell the coolant and see if it smells like exhaust, if it does you have a bad headgasket and it only effecting things when the A/C is on, It will get worse as time goes by if it is a HG. Fixing it now will prevent heat from destroying a bearing and resulting in engine replacement. You can also have the coolant tested for hydrocarbons and that will give a definitive answer as to the HG. Good luck Quote Link to comment Share on other sites More sharing options...
Buick350X Posted September 29, 2008 Share Posted September 29, 2008 been working fine for over a year......... Was no sign of a leak anywhere, coolent just went MIA at random times. Doesn't anymore. Quote Link to comment Share on other sites More sharing options...
roadtrippin Posted October 2, 2008 Author Share Posted October 2, 2008 Type= 02 Impreza RS 2.5 (obvious) Problem was that I would lose 1/4 from overflow after each A/c use and it wouldnt return. Changed out radiator cap and I dont seem to be having the problem now. Hopefully that was it. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.