Question about 1999 Pontiac Grand Prix

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Overheats, engine rattles when idle and when accelerating, radiator fan doesnt seem to spin

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  • Pontiac Master
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If your engine is rattling,it's TOO hot. Get it checked out immediately, and don't drive it ant farther than the repair shop. You may have already done damage to the engine.

Posted on Jul 03, 2009

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2 Answers

I have removed the thermostart of my grand cherokee jeep 1996,i still experience temperature rising while i am in hold up or traffic but reduces as soon as i accelerate.


the thermostat was not the problem but the viscous fan hub ( fan clutch) is
while it is spinning , there is no drive action when idling ( as at lights , slow traffic , hills in low gear etc) and so it is not pulling air through the radiator when needed
your statement that the temp reduces as soon as you start moving means that with forward movement the air is flowing through the radiator and cooling the coolant

Jun 20, 2016 | Jeep Cars & Trucks

1 Answer

01 Audi tt quattro starts to overheat while idling but coils down after driving at higher speed, is it a thermostat or the fast relay switch


overheats at idle only are typically the fan system. Cars use the fan to pull air across the radiator for cooling. Any speed over 10 mph there is more than enough natural wind to do this without a fan. If the problem immediately goes away when you start moving, it is probably a malfunction or issue with the fan. I have on more than 1 occaision had a customer tell me they had the fan replaced and car was still overheating, and it ended up thje fan was spinning backwards or not turning on because of a fuse or relay issue.

If it doesnt cool down fully once speed is above 20mph for more than 30 seconds, there may be other issues like plugged radiator or weak water pump impellars. water pump is a fan that moves water instead of the air. if the blades wear, they still kinda work, but at idle they work poorly because the broken blades only move a little air at low speed, rev the engine up, they spin faster and work better. If the fan is functioning OK (Turns on and off by itself) and car still runs warmer at idle than at rev, water pump may be worth investigation.

May 08, 2015 | Audi Cars & Trucks

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Cant accelerate


disconnect the neg. battery and clean the connectors ECM

Sep 27, 2013 | Hyundai Accent Cars & Trucks

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Will the bad waterpump on a 2003 pontiac aztek cause the temperature to overheat sometimes but run good others?


the water pump is working
the problem indicates blocked radiator cores preventing full flow at high rpm
have it flow tested by an accredited radiator shop or just fit a new radiator

Jul 13, 2017 | 2001 Pontiac Aztek

1 Answer

My jeep overheats if i idle for too long. as long as i am going down the road it doesnt overheat.


Sounds like your cooling fan is not doing it's job while you're stopped. While you're driving, the air rushing past the radiator is cooling the engine. The fan is supposed to pull air through the radiator while you're stopped so it has to be defective. Have it looked at.

Aug 29, 2011 | 1999 Jeep Grand Cherokee

1 Answer

My scerity sys went off and I my car over heats I think it needs a new thermastat


maybe your security system monitors engine temp ... it doesnt have to be the thermastat thats bad .. it could be the radiator fan switch or relay bad .. you can tell which by the following.
1. if it overheats only when idling or in heavy traffic but does not overheat while on the road (moving) then your problem is more likely the radiator fan switch, relay or fan motor ..
2. if your car overheats all the time even while driving then it could be the thermostat ..

check belts, coolent level and radiator clogging ..

Feb 19, 2010 | 2001 Pontiac Aztek

1 Answer

What would cause my 2002 zx2 to overheat ?


Faulty thermostat, failed water pump, inoperable radiator fan, low coolant due to leak, faulty radiator cap, leaking head gasket, low oil, major exhaust leak near front, exhaust blockage, or incorrect ignition timing. If there is crust around radiator cap, cap is leaking. How long does it take to overheat? If it runs smoothly when cool, and all fluids are at correct levels, you can rule our head gasket, radiator cap, and ignition timing. If it overheats very quickly and fluids are correct, it is probably thermostat or water pump. If it seems to do better at higher speeds, it is probably radiator fan. You can check this by allowing vehicle to run in Park with hood open. Monitor engine temp on dash. When it is at or slightly above normal running temp, radiator fan should come on. Also note exhaust sound. If it seems loud and overheats gradually, you may have a leak before the converter. If the exhaust sounds quiet, but exhaust manifold is getting extremely hot (may glow red), there is probably a blockage. There will also be OK starting and idle but poor acceleration if exhaust is partly blocked.

Nov 25, 2009 | 2002 Ford ZX2

1 Answer

Overheating at idle


sounds like a partially plugged radiator. Colder temps will be OK but when weather warms up the problem shows up too...check for leaves etc between the radiator and ac condenser before doing anything else. Stuff on the outside will act the same way as an internal obstruction.

May 06, 2009 | 1995 BMW 5 Series

2 Answers

Occasional overheating


It is easy to check your fan clutch.With engine off and cool reach in and spin the fan blades.They should move real easy.Also make sure your radiator fins are not super dirty.

TK46

Jul 09, 2008 | 1999 Jeep Cherokee

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