Question about 2000 Pontiac Sunfire

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Coolant resevior, over flow hose at top near cap, where does it go back into?

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There will be one hose that goes from the radiator to the resivor, then one that goes from the resivor, which is an overflow tube, it does not connect to anything.

Posted on Mar 21, 2011

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I'm only getting heat when the engine is at 3000 rpms. The coolant reserve is full but I'm not sure if I need coolant in the radiator. I can't find the radiator cap to top it off. When the heat does work...


It sounds like your heater hoses have a blockage. Replace them and it should clear up the problem.
Some models eliminated the radiator cap and can only be filled through the overflow resevior.

Dec 09, 2010 | Chevrolet Silverado 1500HD Cars & Trucks

3 Answers

Can a worn out coolant cap cause overheating


There is no radiator cap on the Northstar engine.
The only cap is on the surge tank (or expansion tank) and is pressurized.

So the answer is Yes, a faulty surge tank cap will result in the loss of coolant and therefore lead to overheating.

The most common overheating problem with the Northstar engine is a blocked purge line(small hose).The purge line is designed to purge air out of the cooling system.
There is a small diameter hose coming from near the top of the coolant tank (not the cap) ,this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.
If the hose is clear, check for blockage at the nipple on the tank.Or trace the hose back until you find the blockage.
The hose goes in to the engine to a crossover and comes out the other side close to the thermostat housing,the blockage may be there.

Jul 05, 2010 | 1998 Cadillac DeVille

2 Answers

How to remove Coolant Reservoir cap to check levels? I can only turn it a quarter (or less) turn counterclockwise.


Yeah don't open the rad cap when it is hot. To cheack the fluid level you dont have to open the steel cap. Check the over flow bottle. There is a level indicator for when the rad is hot or cold.

May 24, 2010 | 1999 Cadillac DeVille

1 Answer

Where do i put water in a Nissan Micra 1997 reg 1000cc


hello, first you should not be putting just plain water in anything. if you are filling the radiator you should use a 50/50 mixture of coolant and water. you can purchase it at any auto parts store or even at wal mart. you can get it allready mixed for your convinience. you will add the coolant to either the radiator or the coolant resevior, depending on how empty the system is. you can look in your owners manual to find a picture of the coolant resevior. if you do no have one the radiator is in the front of the car with a small oval cap at the passenger side, do not open this cap when the car is hot! There should be a small hose going to a little clear tank on the passenger side, this is the resevior, fill it till the cold mark. good luck

May 18, 2010 | 1997 Nissan 240SX

2 Answers

Overheating after driving 10-15 minutes


The most common overheating problem with the Northstar engine is a blocked purge line. It's job is to purge air out of the cooling system.
There is a small diameter hose coming from near the top of the coolant tank (not the cap) ,this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.If the hose is clear, check for blockage at the nipple on the tank.Or trace the hose back until you find the blockage.The hose goes in to the engine to a crossover and comes out the other side to near the thermostat housing,the blockage may be there.

Apr 17, 2010 | 1996 Cadillac DeVille

2 Answers

Engine hot


First of all you need to check your coolant return bottle level, it's probably low, and needs coolant added. Heater will be starved for coolant, if level is low, thus, cool/cold air comes out. Try to add when engine is cool, to avoid getting sprayed with hot coolant. Leave cap off for a while, turn your heater on (not defrost) and let engine run up to temperature, and add more as needed while you watch level. Rev engine slightly and hold it for 5 seconds or so, every once in a while to help circulate coolant, and remove any air in system. If you have an actual rad cap, that you can remove and watch flow in radiator, that's even better, for adding and bleeding air out same way. Make sure your rad fan is working as well, and once you get it topped up, and heat back working, I'd seriously consider having a system pressure test done, as you obviously have a leak somewhere if the level went down to the point of overheating, and heater was starved for coolant. Keep an eye on that return bottle level until such time you have it checked, to avoid more damage to engine.

Dec 12, 2009 | 2002 Cadillac Sts

1 Answer

2001 Kia Rio Cooling is leaking from hose near to the radiator cap.


The small[pencil size] hose connected just below the radiator cap & to the plastic coolant reservior is the coolant over-flow hose,allowing the coolant to flow into the tank as it expands from being heated,and return to the system as it cools.If the leak is near the radiator fitting,possibly damaged portion can be cut off while engine is cool,and hose re-fitted.Replacement tubing is available at auto parts supply stores,identifiyed by it's inside diameter measurement.

Oct 21, 2009 | 2001 Kia Rio

1 Answer

Overheating


You have an air lock in the cooling system.
Do this: pull upper radiator hose off the radiator leaving it connected to the block, pour coolant into hose until filled ( you might have to do it to the radiator also). Once filled reconnected hose back to the radiator, then fill resevior to proper level. Start car turn heater on full. Let car run with cap off resevior until it starts pulling coolant in. Once warmed up shut car off let cool. Check fluid level again.

Jun 18, 2009 | 1998 Ford Taurus

4 Answers

Engine coolant


you need maybe 1+1/2 gallon of distilled water;NOT TAP WATER and 1 gallon of Mazda Coolant; NOT 50/50 mix..

((WHEN THE ENGINE/COOLANT IS COOL>>VERY IMPORTANT!!!))

1.from the radiator, remove the drain plug, let it drain. for faster drain, also remove the resevoir cap.

2.when empty, put drain plug back on refill the resevior with the distilled water until full.

3.with the resevior cap off start engine with heat settings on Hi, until the coolant temp guage begin to rise or when thermostat opens. turn off engine.

4. repeat steps 1-3 until only clear water drains.

5.make sure drain plug is in, refill resevior with Mazda coolant til about half way (in case there's any expansion), do not put cap on yet, let the air bleed. start engine, let it run for 5 min.

6. accelerate in park/neutral to 2500RPM's (DO NOT drive yet) to help bleed the air keep an eye on coolant level because you will have to top it off.

7.check level as temp reaches normal; half point as usual. put resevior cap on drive around the block and check level again. make sure coolant is on the proper level; "F" or "MAX"...of course when the engine cools it will be below, but while the temp is normal it should be on the proper level.

Oct 18, 2008 | 2003 Mazda Mazda6

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