Leaking radiator? Leaking or loose radiator hose?
Your best bet is to visit a good auto shop (seller of antifreeze), and say "I want to buy enough antifreeze for a 1990 Chevy 5.7 truck".
The green color antifreeze will be just fine.
you sell it and buy a Chevy truck
"http://wiki.answers.com/Q/What_type_of_antifreeze_do_you_use_in_a_95_chevy_truck_with_diesel_engine"
correct antifreeze for 2006 dodge ram diesel truck
bad sending unit
you got an antifreeze leak
Maybe your cooling system needs to be flushed out.
Remove the dash, its located under the glove box. Becarefull it will puke out antifreeze!
My truck recently did this and it turned out to be the park lever in the tranny. it is easly fixed and the part can be gotten from a tranny shop for around $10.00
On my Chevy truck it idles high when its low on antifreeze but if its not that more than likely its usually a vacuum line loose or cracked. good luck.
I have the same question but I'm 14 I'm a mechanic at our house. My truck is 1990 Chevy