Help me if you can this ones got me lost.
My 2001 1KZ TE DIESEL Prado suffered a cracked head a couple of years ago, it wasn't overheating but the obvious coolant in oil led to a head replacement.
Since the head was replaced (by qualified mechanics not Toyota) the following has since taken place.
ONLY WHEN OUTSIDE AIR TEMP IS ABOVE 30 degrees, at 100 kph HWY driving on any rise or hill the engine temp will rise rapidly and overheat also causing aircon to blow hot air. Occasionally also on the flat it will rise to 3/4.
If I reduce speed to 80 KMH temp will come down aircon will return to normal.
When in peak hour traffic stop start stop start constant idle with no air flow there is NO ISSUE AT ALL.
Radiator has been tested with infrared temp gun and gauge is correct the following is what steps have already been taken to sort this issue out SINCE THE HEAD HAS BEEN REPLACED.
NEW RADIATOR, RADIATOR HOSES, THERMOSTAT(S) X3, VISCOUS FAN, WATER PUMP, COOLING SYSTEM FLUSHES, LARGER THAN LATER MODEL CUT OUTS HAVE BEEN MADE TO BULLBAR TO INCREASE AIR FLOW, AIR OIL AND FUEL FILTERS REPLACED WITH REGULAR SERVICING.
I'm at a loss to understand what if anything has been missed or if there's an issue with the head or the reassembling on the head replacement or another factor.
It doesn't use or loose oil or coolant no leaks no drips no contamination no blocked condenser NO F@&$!NG IDEA.
HELP DESPRATELY NEEDED my summer dilemer is doing my head in again.
Any helpful advise appreciated THANK YOU, WOODSY..