MY 1999 Pontiac Sunfire is overheating. I changed the thermostat and put coolant in it.The engine gets hot but the radiator stays cold.

10

Asked by May 24, 2012 at 04:45 PM about the 1999 Pontiac Sunfire 4 Dr SE Sedan

Question type: Maintenance & Repair

6 Answers

1,515

u should have used a radiator flush before pouring the coolant your water jackets must be choked with rust they r small hole which r blocked up by rust or corrosion

1 out of 1 people think this is helpful.
10

Could it also be the water pump is not working

1 out of 1 people think this is helpful.
1,515

if u used water as coolant more then proper coolant it could be the water pump as well

1,515

and check for mud or dust also , it should be seen after removing the radiator cap floating above the water surface if your water is brown coloured its rust on water pump and in the lines

1,515

also check your sparkplugs and ignition timing if distributor is present

2,705

is thermostat in backwards? if corrosion is apparent, replace all hoses, radiator could be clogged, and replace water pump , sounds like everything needs to be replaced, cheaper to do it all at once instead of one thing at a time replace radiator as well

1 out of 1 people think this is helpful.

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