coolant system and thermostat

Asked by Aug 23, 2014 at 11:44 AM about the 1999 Pontiac Grand Am 4 Dr GT Sedan

Question type: Maintenance & Repair

i have a 1999 pontiac grand am gt i notice rust in the coolant revoir so i attempt to flush system well i remove pin from the bottom of radiator but nothing would drain so i figureed to much build up from guck so i flush it removing hose liquid was cmpletely brown so i boght flush soluation to help break up guck in lines so for two day i would start car and let cycle the liquid and then i went to remove radiator pin and still nothing come out i fill coolant resevior but car say coolant low could the termostat not be opening? help!!!!!!!!!!1

3 Answers

4,965

detach the lower radiator hose and see what comes out. Not sure what "pin" you speak of butthere should be a few quarts of coolant in the reservoir, radiator, and engine. Taking the hose off will clear the engins (mostly) and the radiator but will not empty the reservoir. After draining, get more radiator flush and folow the instructions. If it has been a whlie since this was done you may want to replace the upper and lower hoses as well as install a new thermostat.

10

YEAH I FLUSH THE SYSTEM AND HAD ALOT OF GUCK IN IT BUT RAN IT TIL IT WAS CLEAR SO I DECIDED TO GO AHEAD AND REPLACE THERMOSTAT BUT THE CAR DIDNT HAVE ONE SO I PUT ONE ON IT PUT EVERYTHING BACK AND PUT COOLANT IN RAN CAR SUCKED IN 1 GALLON OF 50/50 COOLANT THAN I PUT 1/2 GALLON OF 50/50 COOLANT AND CAR STILL RUN HOT 250 FAN KICKS IN BUT IT SAYING LOW COOLANT AND REVOIR IS FULL SO I DONT KNOW WHY CAR IS STILL RUNNING HOT!!!!!!!!!!!!

1 of 1 people found this helpful.

If it still running hot after flushing and putting a new thermostat. It could just be a simple things as air pockets in the coolant system. If it still runs hot start touching and feeling hoses if top hose is hot and bottom cold then might have to change radiator, because of restriction in it if it was as bad as you describe is a possibility your radiator took a crap.

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