the motor simply over heats way too quick. Where's fuse for that fan, please

3,765

Asked by Randy May 30, 2023 at 06:45 PM about the 2004 Buick Park Avenue FWD

Question type: Maintenance & Repair

I bought the car used and it had a good test drive. I bought the car mainly for
the 3.8 v6 that it has. However, I need to solve the over heat issue. is there a
fuse that I am missing for the radiator fans to come on? I went to a GM Buck
dealer in the area and they gave me a spread sheet of parts that are
EVERYwhere and I'm thinking they do this on purpose to get you to give up
the mission or just pay them to fix it. Well.. why? And secondly, why did GM
put round rubber for gaskets?? I took of a valve cover because of an oil leak
and didn't see an old fiber gasket. awkward. I appreciate any help I can get. I
don't see any Buick books available for sale in local parts stores.

2 Answers

157,475

With the engine cold unplug the coolant temperature sensor and start the engine. Both radiator cooling fans should come on immediately at high speed. If they do, the coolant temperature sensor is the most likely suspect. If they don't, check the three relays in the underwood fuse box. The two that have four pins are for each fan, low speed. The one with five pins is for both fans, high speed. The fans should also come on when you select recirculation on the air conditioning control panel with the air conditioning on. These engines are also prone to intake manifold gasket failure. Both upper and lower. If you need to replace these, replace the upper intake manifold, don't reuse it! These engines rarely blow head gaskets. So if the oil and coolant are mixing, it's not the head gasket, it's the intake manifold gaskets. You could also have air trapped in the cooling system. These engines are great for that too! There's a bleeder screw near the thermostat housing that must be open when refilling the cooling system. If your heater is blowing cold air I'd suspect air in the cooling system. If it's overheating while driving it's a coolant circulation problem, such as air in the cooling system, a bad water pump, clogged cooling system passages, or a stuck closed thermostat. On my 2000 Grand Prix the impeller in the water pump was rusted away to the point I had poor coolant circulation. No other symptoms. No noise, leaking, or anything. If you're overheating at idle then it's an airflow problem. Such as the fans not coming on, a radiator or air conditioning condenser, that's in front of the radiator, plugged with leaves, dirt, etc., or missing air deflectors under the vehicle, or a broken or missing fan shroud, if originally equipped. The Buick Dealer, unfortunately has no interest in working on a 19 year old vehicle. If you want to take it to the Dealer, try your local Chevrolet Dealer. They're less snooty. Hope that helps! Jim

310,035

WOW James you pretty much covered the whole question, I have nothing to add.

1 people found this helpful.

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