I am working on my daughters 1999 Grand Am with the 3.4 L V6. I was told by a shop that the heads gasket(s) were blown and needed to be replaced. So, because I’m her dad (a better than average backyard mechanic) and she’s a college student with more debt than money, I thought I would tackle this to save her some money. Well, the front head, cylinders 2,4,6 showed a “clean” cylinder2 while 4 & 6 looked ok. The rear head had no visible signs of leaking to a cylinder. After cleaning and reassembly, everything appears to be in order except for;
When starting from cold, the engine runs for about 15-30 sec. and the radiator fans come on. I thought that this was strange since this didn’t happen before and I was told by someone that the fans don’t come on until the coolant temp reaches 230 degrees.
After running the vehicle for about 20 minutes the heat to the interior is very good. In fact its downright HOT. However, the temp gauge on the dash reads “100”. Thinking I broke the sensor while I was working on it, I replaced the sensor. No change.
The “Low Coolant” light on the dash is on, yet the level in the surge tank is above the full cold mark. I’ve replaced this sensor twice. No chage.
I would appreciate any advise here. Thanks for your time.