![]() There is only 300 KM's on the oil and filter. I of course used what the owners manual called for - 5w30. I hope this helps as i've had my Corsica for about 8 years now and it's probably one of the better cars i've ever owned.Well, since I bought the car used, the first item I changed was the oil and filter. One other thing to check is if it might be air locked this would also cause it to overheat. That was about five years ago and never had another cooling problem since so i'm assuming this worked. Now, what i did was changed to 10w30 for summer time. Did the collant pressure check and all that and came up fine. I had the same problem with my '93 Corsica. What other ways can I check that the water pump is flowing the coolant properly? Unless the water pump is bad, but I do not hear any bearing noise and as mentioned there are no signs of coolant leaking. The intake gasket looks fine (not dripping coolant). It cant be a cracked head gasket or block. The service manual is indicating if you have a Corsica with a temp gauge (if you have a temp gauge then you do not have an overheating dash light) and the gauge is pass the 1/2 way mark, the car is overheating. Once the fan engages and is on between 40 - 90 seconds before switching off, the temp on the t-stat housing is 85 and the temp gauge in the car is slightly below 3/4. I don?t think the gauge is bad, I used an infrared temp gauge and pointed it at the t-stat housing, the temp was 95c which is 205f, the gauge at this time is reading 3/4 (which is about correct). ![]() Anyhow, the sensor located at the t-stat housing sends signal to the ECU, the sensor (which I did not change) located on the head (lower rear of engine) sends signal to the gauge. I guess I can take the car to a local mechanic the charge for a pressure check can?t be that much. The problem could be no problem at all though.AutoZone, we don?t have them in Canada. I never remember which sensor goes to the gauge, and which goes the ECM. You can then check for external leaks visually or watch to see if the pressure either doesn't build or drops slowly. It replaces the radiator cap, and you pump it up to 15 psi. It scares me to drive the thing and have the engine overheat, which is bad news. The plugs would be fouled my old ones were in good condition.Ĭan anyone offer any help. ![]() I do not think the head gasket is cracked since I do not see bubbles forming in the coolant tank. I am concerned since, if the head gasket is cracked (which from what I have read is common on this engine) the temp would run hot. I called a GM stealership the service rep is telling me the gauge should be sitting 1/2 or a tad higher but not 3/4. Anyhow, the stupid thing still runs hot! I don't under stand it, at idle it climbs to 3/4 and the fan fires up, stays on for 40 - 90 seconds, then its off. I decided to give the car a tune up, (new wires, new plugs, new fuel filter, new PVC valve, new air filter, new rear shocks and mounts (old ones were leaking), new rad, new t-stat, new coolant sensor, new upper and lower rad hoses. ![]() Anyhow, the thing runs at 3/4, which concerns me. Rust checked every year with only 69,850 KM's (I am from Toronto, Canada) and only 2,900 dollars. I just purchased a used 1990 LTZ (3.1L V6), I needed a daily driver / winter beater and this car was in great condition.
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