I recently rebuilt the top half of my engine (failed head gasket) and it’s running great … except … I’m now having higher than normal engine temperatures, 2 or 3 bars above the 90 deg (normal) position. In the past the temperature NEVER indicated higher than 1 bar above normal and that was while I was sitting at idle for an extended period of time.
+1 bar = 95C … 203F
+2 bars = 100C … 212F
+3 bars = 105C … 221F
+4 bars = 110C … 230F
It tends to happen at low speeds or at idle so …
Fan shroud and rubber blow-thru flaps are all in excellent condition and working properly.
Recently flushed radiator and filled with fresh 50/50 coolant. Radiator and condenser are free of any external debris.
Replaced coolant temp sensor with new unit… no change. Digital temperature gauge seems to be reading accurately based on temp that thermostat opens.
So this leaves me with the fan clutch or the radiator. The radiator has never been out of the car so I’m thinking of removing it and having it opened up, cleaned and rodded.
Also I’m planning on replacing the fan clutch. When cold it spins around about 90 degs. When hot it spins through about 180 degs. Not sure but this doesn’t seem correct, is there any reliable why to test it? The price for the jaguar replacement fan clutch are ALL over the place, from $50 to $250. Any advice on a quality clutch?
So does anyone have any inputs based on these symptoms ? My fried thinks it could be a clogged catalytic converter ? I still have the originals on the car.