QuestionHi Kevin!
past weekend i note that my 1999 lhs run in half of the temperature gauge on road at 70 mph,for 2 hours the outside temp was 37`f and the radiator fans are running in high speed, but the temperature dont drop, always are in the half of the gauge and the fans running.
i change the termostat,install a new waterpump, new pressure cap, cleaned the radiator and bleed the sistem, refill with prestone 50%. is not overheating, but i dont like this because the fans are always running and the temperature dont drop from the half.
the fans start running at 220 F and still running we see this on a obdii reader, but the temperature dont drop... I'm in Mexico and dont speak english please sorry for the spelling and gramatical errors!"
AnswerHi Luis Eduardo,
The gauge at half is fine, no problem, that is due to the thermostat keeping it there which makes for a more efficient engine. It may be that you have some air trapped in the cooling system if you didn't refill it properly after it was drained. There is a coolant bleed nipple on the top front of the engine, just in front of the intake manifold (and adjacent to the MAP sensor). Attach a 4 foot length of 1/4" hose to the nipple and then open it valve. Then route the hose over the front of the car into a can to collect the coolant (you don't want coolant to get on the drive belts). Pinch the coolant overflow hose on the neck of the filler bottle closed with a clamp. Then add coolant to the overflow bottle on the side of it that is directly under the pressure cap until the coolant starts to flow out the end of the 4 hose, then shut off the coolant bleed valve, and use the collected fluid to fill the pressure side of the overflow bottle and save the rest for later. Remove the clamp on the overflow hose. Put the cap on the bottle.
That may make the engine run at a lower temperature once you have gotten rid of the trapped air.
Your english is is terrific!
Roland
PS Sorry for the delay, I just saw your question in the "question pool" where Kevin had sent it.
