Re: 1998 Grand Marquis Overheating
I decided to try to bleed the cooling system. In the Ford technican service manual it tells to bleed the system by turning the heat on full, put the reservoir cap on and run the engine until the thermostat opens and the hot water fills the whole radiator. Then shut the car off, wait for it to cool down and then fill reservoir to proper level. I did that but mistakenly thought it said to keep the reservoir cap off. After about 7 minutes of the engine running coolant started to flow out the top of the reservoir before the thermostat had a chance to open up and I shut the car off. Should the coolant be coming out like that? I then put the cap on to do it the proper way. While the engine was running the fan came on and the thermostat(195 deg.) had not opened up yet. I thought I read somewhere that the fan doesnt come on until the engine temp reaches 195 degrees. The thermostat eventually opened but not until about 5 minutes after the fan went on. Also before the thermostat opened the heater hoses were warm not hot and the heater was blowing just barely warm air. As soon as the thermostat opened the heater started blow hot air, the heater hoses got hot, and the engine fan went off. So should there be more coolant flowing through the heater core than there is when the thermostat is closed? And should coolant be flowing out of the top of the reservoir when the cap is off and before the thermostat is open?