spawn4u69 Posted July 28, 2010 Report Share Posted July 28, 2010 i have a 1999 cadillac seville sls that is over heating i changed the thermostat and still over heating can it be my water pump and could it be that the radiator also has brown water should i flush it? Link to comment Share on other sites More sharing options...
winterset Posted July 28, 2010 Report Share Posted July 28, 2010 What do you mean by overheating? - the radiator erupts violently, or is the temp gauge hitting 220? You need to check your crossover hoses to make sure they are not blocked. additionally if your 2 cooling fans are working, and make sure your waterpump belt is not slipping (there is a waterpump belt tensioner that can get hung up) How long have you owned the car? Do you know the history of the coolant? Brown coolant is normal for a '99 dexcool is orange, and the required supplements adds a murky brown discolor to the coolant. search this forum for crossover hoses Hopefully this will get you started Link to comment Share on other sites More sharing options...
BodybyFisher Posted July 28, 2010 Report Share Posted July 28, 2010 Pay no attention to the 'brown' coolant, that is from the cooling supplement, but test it as noted below. Unless that water pump is 1) leaking at the shaft seal, 2) leaking at the body seal its OK, don't worry about it. You need to check the following, if you can answer these questions please do Does cap hold pressure, if cap is old replace it, make sure it it stock Is coolant at least 50/50? Is the purge line clear? Ask if you do not understand what I mean Are the cooling fans working correctly? Has the thermostat been replaced? Does the cooling system leak pressure? Has it been pressure tested? Has the water pump belt been checked/replaced? Has the water pump belt tensioner been check for free movement and that it applies good tension to belt? Are you getting pinging? Are you losing coolant? Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
Ranger Posted July 29, 2010 Report Share Posted July 29, 2010 Then get a block test kit from Napa or rent one from an auto parts store that has a rental program and test the air in the surge tank for exhaust gases. Link to comment Share on other sites More sharing options...
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