the1andonlyGR81
Dedicated LVC Member
That was a sign that the water pump was takin a sh!t. You went & changed the thermostat... That was more of a remedy than anything else. It's just your water pump. Buy a '99 Cobra water pump. Makes your car run a bit cooler. I did that to my 93.
according to ford parts the 99 cobra pump and the 98 mark part #'s are the same.
954-644-5015