Question about 1996 Pontiac Sunfire

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Overheating can't get fan to work replaced rely and tested fan also new thermostat and pump ????????

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Check the engine coolant temp sensor.... this controls the computer to turn on the fan

Posted on Oct 10, 2008

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1996 sunfire replaced waterpump,thermostat and heatercore. Relay is working to fan. Tried bleeding air out of resevoir but car still is getting hot. just not as fast as it was. Could the sensor be causing an issue still

Posted on Jul 13, 2010


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My honda cr-v 1999 is overheating how do I check the water pump is working?

the water pump will be working
what won't be working if fitted is
the viscous fan hub
radiator fans ,
coolant temperature sensor
fan relaypressure test the cooling system to check for cracked plastic tanks of the radiator
fan fuses
blocked radiator cores
head gasket
so if the fan is driven by a belt then replace the viscous fan hub
have a compression test done to check head gasket
have an auto electrician check the cooling system electronics and fans
have a specialist radiator shop do a flow test on the radiator and have an accredited service shop check the operation of the thermostat

Nov 19, 2016 | Honda Cars & Trucks

1 Answer

My 1996 3.0 2v taurus gl is overheating without the thermostat. my dad said it may haave a second one. does it?

Only 1 thermostat. You should be able to feel the pressure in the upper hose if the pump is working. Compression test to check for cracked head/blown headgaaket, are the cooling fans work I g...lots of possible causes.

Aug 29, 2016 | 1996 Ford Taurus

2 Answers


Water pump or thermostat .

Jun 11, 2016 | Cars & Trucks

1 Answer

I'm having problems with my 2000 honda. It keeps

A few questions first...are you sure its overheating and not just a bad temp sensor? is yes then how many miles on car? if over 90K than did you have the water pump replaced with your timing belt?Is your fan coming on at all? Is your radiator full?If your water pump has been changed and your radiator is full and your fan is working properly and you have a new thermostat then you should take your radiator off and have it flow tested to make sure its operating properly, and no you cant just pour water through it to tell if its working properly.

Oct 29, 2011 | 2000 Honda Civic

2 Answers

2000 mazda mpv overheating with new water pump and hoses?


If you car is still overheating with new water pump and new hoses, there is still a few other things that can cause your over heating problem. Now, by you replacing water pump is good that you took care of one of the main things, however here is some other things to look at.

Number One, is your thermostat. Sometimes the thermostat gets worn out, and will not open and close properly, it is designed to open under a certain temp, but it could be stuck or warn out.

Number two, is check out your radiator, can put under pressure test, but best thing to do is a radiator flush, and see if flows proper. Sometimes the radiator core/coils get clogged.

Number Three. Check to see if your fans are coming on and proper speeds, normally as car gets to a certain temperature, they will kick into high speed.

Last thing, is make sure you have no head gasket leaks, as this could cause over heating, best way to check that, if its not obvious is, pressure test.

My opinion what I would first check, is the water thermostat and then radiator flush, if fan is working.

Thanks Mike.

Sep 08, 2011 | 2000 Mazda MPV

1 Answer

New water pump' thermostat,purge line. not heads or gaskets and still running hot

You say "Water pump thermostat" do you mean Thermostat or water pump? If you replaced the thermostat and still have an overheating problem then look at the water pump itself as the problem if that is replaced and you still have the problem then you have another problem in the engine or a clogged radiator core. You may have a lubrication problem in the motor, if the oil pump went out or your low on oil then the engine may be overheating from lack of lubrication. Another thing that will cause overheating is if the Fan is Electric and not activating or if the radiator fan is mechanical the clutch is not allowing the fan to rotate free when you are driving.

Feb 18, 2011 | 1996 Cadillac DeVille

1 Answer


Here are a few things to try. Check your Radiator cap pressure as a weak cap will boil over more quickly. Replace your Temperature sending unit. There may be 2, one is for the dash gauge and the other is for engine control. Unless you have other signs of overheating you may not be overheating at all, just a bad sender.

Next, the cooling fan clutch is what the fan blade is mounted on. This is checked by using a Timing light with a RPM tach made into it. The fan clutch "locks" at a variable temperature. In cold weather it slips internally. In hot weather it engages or "locks". A mechanic measures the RPM of the blade to the RPM of the engine. This tells if the fan clutch is slipping too much internally.

Before considering a new water pump try a free scan at Autozone or Oreillys. If your Catalytic converters are plugged the engine will overheat. You should have a Code for this problem in the onboard computer. About all you can try after this is to remove the Thermostat completely and see if the engine still overheats.

You will have to replace the New Thermostat again because the other engine controls will not work right without it. But without the thermostat you can test for collapsed Radiator hoses at say 2500RPM or above. Thats about all I can think of, the water pump would cost the most. The cap, sensor-sender, fan clutch, and hoses are not that expensive.

Aug 12, 2010 | 2000 Ford Expedition

1 Answer

Overheating engine

Was the thermostat put in backwards? I know this is a silly question, but I've seen it happen. The water pump will fight it if it is. Another thing are the coolant passages, are they flushed out? Also, if that fan clutch is the original one, I would go ahead and replace that as insurance against the water pump breaking.

Dec 26, 2008 | 1985 Mitsubishi Mighty Max

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