ajskyman
Member
- Joined
- December 26, 2012
- Messages
- 29
- Reaction score
- 0
- City, State
- Colorado
- Year, Model & Trim Level
- 2002 Ford Explorer 4.6L
We have a 1991 Ford Ranger with the 4.0L v6. It never warmed up and I finally pulled the thermostat to find it stuck open. After replacement, the engine warms up great and the heater puts out heat for the first time in years. The dash gauge for coolant temp gets into the normal and then fluctuates all over the place....but since it was always cold, I feel the sensor is probably just bad and never noticed because it had always been on C. The radiator is full and the reservoir fills and drains properly. The coolant is quite dirty even after first flush but that will be taken care of completely once I have a bit more time. Where the concern comes in is that occasionally there will be a thump that can be felt/heard in the vehicle. This occurs when the engine is at idle, and when driving, the problem stops. Also, after the engine is shut off, this condition will continue for around a minute or so after shutdown. This never happened before the thermostat was replaced, so is it just the shifting of mounts that have been cold for years? Or perhaps slight boiling of the coolant? I am not sure that the coolant is boiling because the reservoir does not overflow...but perhaps the cap is slightly under pressure allowing for the boiling point to be a bit lower and the condition never showed due to constantly low engine temp.
Any thoughts are welcomed and I appreciate all member's time!
Any thoughts are welcomed and I appreciate all member's time!