2001 Cadillac El Dorado, ETC,
V8 4.6 L, 279 C.I; 300 HP, VIN: 1G6ET129881B105733 Engine
May 2009. Coolant leaking from reservoir tank, deteriorated plastic at outlet: Replaced reservoir tank with new OEM tank and new Dexcool 50/50 mixture.
July 2009. Radiator
tank gasket leakage: Replaced radiator OEM replacement type and coolant Dexcool 50/50 mixture.
Sept. 2009. Noticed cooling system level down approximately 2 qts. every 4 weeks, temperature needle would deflect ¼ “ to the right of normal on a 5 miles long grade approx. 500 feet in elevation, ambient air temp 58 degrees. Also smell anti-freeze when pulled vehicle into garage. Normal temp past 8 years: 1 needle width to the right of center. Cooled engine to ambient temp 8 to 10 hours in garage to 65 – 75 degrees, service coolant Dexcool 50/50 mixture.
Jan. 2010. On going re-servicing intervals narrowed to every few days. Loosing coolant out of reservoir overflow hose.
Jan. 2010. Purchased Stant Pressure Checker: Found pressure cap, 18 psi. rated, leaking pressure not holding but 5 – 8 psi. Purchased new OEM pressure cap. Pressure tested to 18 psi held at 16 psi. Pressure tested system and cap, no leaks.
Feb. 2010. Thermostat reflected opening at 195 degrees, normal on OBDII scan tool. Replaced thermostat with OEM unit serviced coolant Dexcool 50/50 mixture. Checked water pump
drive belt and tension good. On going re-servicing for the next two months, narrowed to every day 1½ quarts coming out of over flow at reservoir tank. After driving approx. 70 miles mostly level or down grade ok, temp approx. 197 to 204 degrees per OBDII scan tool until the last part of trip. A 5 miles long grade approx. 500 feet in elevation last leg of trip 58 degrees ambient air temperature. Then system reflects a temperature approx. ½ “ to the right of normal but not into red approx. 234 degrees per OBDII scan tool topping the grade at 75 mph daily.
Mar. 2010. Replaced both right and left cooling fan relays and series parallel cooling fan relay, total 3 relays.
April 2010. Took car to Cadillac dealer, Dealer checked cooling fans with A/C on, both fans run, with A/C off cooling fan comes on at spec. 221 degrees. High speed fan comes on at spec. 234 degrees. Pressure checked system no leaks. Checked cooling sym for engine gasses passed chemical test no combustion chamber leaks into cooling system. Found pressure cap bad, warrantee cap topped off sym.
May 2010. Re-checked pressure cap found OEM leaking down to 10 psi. Replaced pressure cap with Stant brand cap pressure holds at 16 psi. pressurized to 18 psi.
May 2010. Replaced radiator with warrantee OEM style radiator service coolant Dexcool 50/50 mixture. Cooling sym runs normal until going up grade then depending on grade it can pull temp up to 244 high speed fan comes on with air on.
May 2010. Extended hose from coolant reservoir to 2 qt. plastic container to catch over flow when going up grade.
May 2010. Checked for discoloration of exhaust
pipe forward of Catalytic converter also aft. found normal. No swooshing noise from exhaust when accelerating, engine revs up fast normal. Transmission serviced normal fluid bright red no burnt smell no slippage noted. Gas mileage normal 20.2 to 21.6 daily highway. Climate control operates normal cycles on and off as needed maintaining desired temp. Engine oil and filter is changed between 3 and 5 K miles 5 – 30 W. Gasoline used 91 octane.
Items not verified or replaced: visual of water pump and rpm of cooling fans.