tgowen Posted August 15, 2011 Report Share Posted August 15, 2011 i have an 95 seville sts. I replaced the water pump, the thermostat, and the cooling fans, and im still overheating. not a head gasket oil looks fine, not blowing any smoke out of tail pipe. what and where is the air purge line located, and if there is air in the cooling system will it really overheat lie that Link to comment Share on other sites More sharing options...
BodybyFisher Posted August 15, 2011 Report Share Posted August 15, 2011 You say "not a head gasket, oil looks fine". Are you assuming that if you had a bad head gasket you would have coolant in your oil? If you are, that is an incorrect assumption. You can have a bad head gasket and NOT have coolant in your oil There are two hoses on the top of the coolant tank, an overflow and a second hose. Follow the second hose across to the engine to where it enters the engine, (should be near the throttle body), that is the purge line. To test the purge line, gently pull that hose off the top of the coolant tank and let it hang, with the engine COOL Go and start the engine dont race it, let it idle Go and look at the purge line that is hanging, coolant should flow.... that is where air comes out of the cooling system when you fill it. AND YES, if there is AIR in your cooling system the water pump will cavitate and not pump coolant and you WILL overheat Have you checked to see if your cooling system holds pressure and the cap is good? how is the water pump belt? do the cooling fans work? have you changed the thermostat? Tell us what you find 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 August 16, 2011 Report Share Posted August 16, 2011 if there is air in the cooling system will it really overheat lie that You bet. When you do the purge line check that BBF suggested, open the surge tank cap and stick the purge line inside. That way you'll recover the coolant and won't make a mess. Link to comment Share on other sites More sharing options...
tgowen Posted August 17, 2011 Author Report Share Posted August 17, 2011 hey thanks for the info. going to try it today after work, and i was assuming, lol. now when i let it run the temp climbs up to about 220, when i give it a little gas it comes down a few degrees. does it still sound like an air in the system problem? hopefully Link to comment Share on other sites More sharing options...
tgowen Posted August 17, 2011 Author Report Share Posted August 17, 2011 Ok so I am foreman at a scrap yard, and 1 year ago an older gentleman drove this gorgeous gold seville sts on the scale. Yes he ws scrapping it, all because he ws having overheating issues(wich are now solved thanks to you all) and the rear subframe connecting the rear wheels together was snapped. So i bought the car for scrap price, little under 500...lol...picked up a new rear end for 150...ive got a grand total of about 1,000 (including what i paid for the car) into the car. theres not one spec of rust or scratches on the car. the only thing i have left to do is replace the windshield, bleed the brakes, get an alignment, tune-up, oil change, and then take it to a detailer. Link to comment Share on other sites More sharing options...
BodybyFisher Posted August 17, 2011 Report Share Posted August 17, 2011 220 degrees does not sound like a problem, what is your outside temp. Does it get above 220 degrees? Normal is 195 to 205 at highway speeds but it will rise a bit from that in the summer In traffic depending upon the outside temp it will range from 217 to 228 With the AC off, you will see higher temps, as the fans don't run at full speed, and they will cycle on and off, off at 217 and on at 228. On very hot days in traffic, I have seen higher temps up to 245 in heavy traffic, which is ok, if you cooling system is good and you have at least a 50/50 coolant mix. Now, if your cooling system leaks pressure due to leaks even small leaks the temps will be higher, 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...
tgowen Posted August 17, 2011 Author Report Share Posted August 17, 2011 thank you all again for your tips and suggestions. blowing out the air purge line did the trick. at idling the temp stays at 207-208. almost done. Link to comment Share on other sites More sharing options...
Texas Jim Posted August 17, 2011 Report Share Posted August 17, 2011 thank you all again for your tips and suggestions. blowing out the air purge line did the trick. at idling the temp stays at 207-208. almost done. Glad that fixed your problem... I am assuming that you blew air thru the purge line into the engine... If you did, whatever was clogging the purge line may come back and clog it again. If this happens, follow the purge line to the engine... it connects to a HOLLOW BOLT... REMOVE the hollow bolt and remove the obstruction there... Blowing backwards thru the purge line is usually only a temporary fix. Whatever is blocking it needs to be removed from the system. Link to comment Share on other sites More sharing options...
BodybyFisher Posted August 17, 2011 Report Share Posted August 17, 2011 OH NO...... WHO TOLD YOU TO BLOW ANYTHING??????????? I said COME BACK with the results of your TEST, nothing else Explain exactly what you did 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 August 18, 2011 Report Share Posted August 18, 2011 If you did, whatever was clogging the purge line may come back and clog it again. Most likely it was sealant tab residue and will be chopped up by the water pump impeller. I wouldn't be overly concerned about it. Link to comment Share on other sites More sharing options...
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