![]() I gotta 1999 pontiac grand am se 3.4 it ran ok when I first got it then seripeteen belt broke overheated a lil had problems since.got belt fixed then had problems with the fans not wrking also so hooked them up direct an found out outta 2 fans one wrked. Be SAFETY AWARE if you do this as the engine is running! Switch off the engine as soon as you see the coolant flow in the neck of the radiator. You only need to see the movement to prove that it is flowing. If you don't see this the water pump may be faulty, a broken impeller perhaps.īE CAREFUL because as the coolant heats it will expand and flow out of the neck of the radiator. After a while when the engine warms the thermostat will open and you should see the coolant start to "flow" (or swirl) in the neck of the radiator indicating that it is being pumped through the system. Observe the coolant in the neck of the radiator. Not blowing hot air in cab could indicate faulty valve that opens to allow coolant to flow through heater radiator in cabin.Ī check that you could do is with a cold engine, remove the radiator cap and then start the engine and allow it to warm up. other indicators of a blown head gasket are white smoke from exhaust, oil has a whitish colour, coolant leak below the exhaust manifold etc. If not then you most probably haven't got a blown head gasket. Hi know your vehicle but are you losing coolant? Is it only the temperature gauge telling you it is over heating or are there other signs of it over heating, if so what are they? Does the car lack power? What kind of mileage is on the car? When you replaced the water pump did you replace the timing belt either time? Have you tried running it with out a thermostat? What is the temperature rating of thermostat? Was the thermostat professionally installed? There should be more than one temperature sensor on the car 1 for the gauge the other to control the electric radiator cooling fan, you mentioned only replacing 1, which one was it? I have given you some things to investigate but to really help you with an answer I must ask for a little more information with all the parts you say you have replaced in a 6 month period of time. After that is timing, again a diagnostic scan would confirm this _ free at autozone. ![]() Autozone should be able to test for this for free with their diagnostic scanner. ![]() If those check out good the next thing to consider would be a clogged catalytic converter. More than likely it is the fan(s) or hoses. Have you checked it? Are you certain your fan(s) is working? The next thing is collapsed hoses if your hoses aren't firm, hard to compress they need replaced. Usually those fans always have electric and the sensor acts as a ground when they engage. Either the fan(s) are bad or the sensor that controls them is. The first thing that jumps out at me is the electric cooling fan(s). You have replaced a number of parts, most of the cooling system, some of them twice. ![]()
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