Question about 1998 Buick Century

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98 Buick is heating up, and when it does it blows cold air. Is that the thermostat going bad or is that the water pump?

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Most likely it's not the water pump.. it could be therostat or clogged radiator, in some rear cases i've seen the radiator hoses collapse when they heat up....also check the fan or fan clutch witch ever you have...hope this helps you??

Posted on May 23, 2011

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Both the thermostat are the water pump would cause the car to over heat, If your heater is blow cold then you should check your coolant level if that is good then you could have a clogged heater core! One good way to blow your heater core is to disconnect both heater hoses from the fire wall and take a garden hose and blow out the heater core in one direction and then switch and blow it out in the opposites dierectionthen reattached your coolant hoses back to the heater core and you well have heat!

Posted on May 23, 2011

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1. if your thermostat is going out...you will generally over heat if its stuck in the closed position....initially you might not even notice.but watch your temp gage.

2. If sticking in the open position..rare... your car will require a longer warm up period...operating temp.....heater takes longer to heat up...tough to check in the summer time...if you think its going out then just replace it and be sure to install the new gasket that should come with it....they are cheap and one of the easiest things to fix on a motor...failure to fix it can result in an overheated engine, oil breakdown and seized engine parts

3. Water Pump.
Listen for a faint ( initially ) metal on metal sound from the front of your motor.... easiest thing is to take a cut off broom handle...solid wood....place it on a section of the pump where you won't get hit by the belt or fan blade...then place the stick against your ear and listen...you will hear a faint smooth grinding sound...thats the bearings...if its chattering or very loud, then you have a pump going bad...also just before they go out you should see water dripping from the bottom of the pump or engine, near the pumps location.
You can buy stethoscopes and use water hose etc to check it but the wooden handle is the cheapest.

Posted on May 23, 2011

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I have a 98' Pontiac Grand Am GT. Car over heats in less than 2 miles and ?the heater blows out cold air, how can I fix this


Hi Josh-
I assume that you have the proper mixture and levels of coolant in your radiator and plastic overflow tank. Open your radiator cap (when the engine is cold) to make sure this is the case. If not, fill as directed by your owners manual.
If the cooling system's thermostat is bad, the hot coolant coming from your engine can not circulate to the radiator in front of the car to dissipate this heat and return to the engine colder.
The odd part you describe is that cold air blows out of the heater. If your car is overheating, you should have above average heat, since your car is running hot.
A bad water pump may also prevent coolant from circulating correctly. Usually, a bad pump will show up as a puddle of coolant underneath your car-since the bearing or seals usually wear out on the pump. However, I've seen where the internal blades or impellers of the pump have worn out due to deposits in the coolant due to infrequent replacement.
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sounds like engine pressure is entering the cooling jacket from either a bad gasket or a cracked casting..unless the water pump is bad..

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Maybe a thermostat..or the heatercore clogged up..If the vehicle runs hot pretty quick then its the thermostat stuck closed..If the vehicle is not running hot,but you have no heat then the thermostat will be stuck open or the heater core not circulating

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check your water pump if it go's out it will cause you car to over heat and blow out cool air. if not water pump check your thermostat ez way is your hose on the left side (driver side) hot or cold if hot thermostat probably fine. if cold replace it. and it never hearts to do an coolant flush. last but not lease those motors are notorious for bad intake gaskets.
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