Hi, not a new problem I believe, but I would need some help in taking a decision here!

1994 TB42 with about 90'000k that has been driven most of its life here in Dhaka city, in a hot, dusty environment with heavy traffic (start and stop all the time).

I suspect the engine is overheating a bit, bcs after 15 minutes or so after starting the engine the temperature gauge is already up to the middle, and after some more time (with a/c on) the temp goes up to 2/3 (no towing or anything).

Went to 2 different workshops and both basically laughed when I suggested to put in an aftermarket temp. gauge... The first one suggested changing the fan engine (?) after a rapid checking; the second workshop suggested to open up the engine block (head), replace the whole head-gasket and replace (?) service the head valves (plus cleaning, flushing etc.); everything for some 700$.... (head valve? 200$, head-gasket kit 50$, valve cover gasket 100$, radiator servicing and cap 30$, spar plug 40$ etc.)

By the way, I get horrible figures, with 2.5Km per liter... (both a/c on, mainly first and second gear...).

Suggestions on how to proceed? Note that Radiator and fan are 3 years old, front a/c has been replaced 6 months ago, engine oil and servicing ever 6 months, new spark-plugs ...

I am totally ignorant about engines, but I love that big truck! HEEEEELP. Are they cheating me or shall I trust them?

Tom