need help car over heating - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

iansproj240 · 09-06-2005, 01:05 AM

im not sure if its my radiator or my water pump. i just replaced my thermostat so its not that im confused on whats wrong with it. the top hose that goes from the radiator to the engine it gets really hot but the hose underneath does not get hot at all. please i need help thanks 1995 240 sx

The Hamsterball · 09-06-2005, 01:33 AM

It's normal for the top hose that leads from the top of the radiator to the engine to get hotter because the water from the radiator is leading away from it and that is where the water from the engine is going through.

The lower hose should be cooler since it is leading water from the radiator to the engine.

When you replaced your thermostat,
did you just fill up the coolant and start her up?

If so, you probably have air in the system.

Any time you drain coolant and then refill it you have to bleed the air out of the system, since our cars like to trap air so easily (as well as most other cars out their that have a bleeder valve).

To bleed your cooling system, let the car sit till the engine is cold.

1. Take off radiator cap.

2. Look at your upper radiator hose. Find the connection to the block.
Right in front of the connection to the block, there should be a screw with a sticker on your intake manifold behind the screw saying "HOT" or "Don't touch" or something with japanese writing.

3. Unscrew that screw out of your intake manifold. That screw is your "bleeder screw"

4. Top radiator off.

5. Start engine.

6. Keep radiator cap off until the coolant starts to over flow out of the radiator hole.
After coolant starts coming out, fully top off the radiator and put the cap on immediately.

7. Stay in front of your car and watch the bleeder screw hole.
Keep the screw off until you see coolant start flowing out of the hole.

8. After coolant starts flowing out of the hole, screw the bleeder screw back in.

9. Turn car off.

10. Wait till car cools down, open radiator cap, top off radiator.

You're bled. And it shouldn't over heat, unless if you have a different overheating problem.

sw20>>s14 · 09-06-2005, 02:21 AM

wut he said...either you didnt properly bleed the system or you installed the thermostat wrong...jiggle valve up

iansproj240 · 09-06-2005, 08:29 AM

thanks for the quick help. if its the water pump the bottom one would be hot too right. what about if the radiator is clogged how woud you know.

aznpoopy · 09-06-2005, 09:27 AM

yay

hamsterball is my hero. i was going to do it the FSM way but this seems easier...

The Hamsterball · 09-06-2005, 02:09 PM

what it tells you to do in the FSM is a FLUSH.

That's when you flush out the entiiire system.

I'm just giving a procedure to bleed air out.

I forget how to check if your water pump is working or not.

Don't worry about the water pump for now unless it overheats after bleeding.

aznpoopy · 09-06-2005, 05:51 PM

coming off a bone dry motor (fully drained)

i've already topped off the rad, filled it with the heater set to hottest position, with the air bleeder open

i know it still has air in it. should i continue using the FSM procedure, or can i do it with your method?

The Hamsterball · 09-08-2005, 03:43 PM

dude..

it aint rocket science.

If you fully drained it, then there's no need to do the FSM flush procedure.

Just bleed the air out and top off the radiator after bleeding.

kazuo · 09-08-2005, 04:01 PM

You have air in the system (most likely), or you installed the thermo wrong (highly unlikely).

Bleed the system and go from there.

If the pump was bad, it would be leaking coolant.

Good luck

The Hamsterball · 09-08-2005, 10:45 PM

Quote:

Originally Posted by kazuo

You have air in the system (most likely), or you installed the thermo wrong (highly unlikely).

Bleed the system and go from there.

If the pump was bad, it would be leaking coolant.

Good luck

Thank you for helping me drill the same information that was already posted in his head.

but at least you added the water pump information. I didn't know that the only problem they can have is leaks.

kazuo · 09-10-2005, 01:32 AM

Quote:

Originally Posted by The Hamsterball

Thank you for helping me drill the same information that was already posted in his head.

but at least you added the water pump information. I didn't know that the only problem they can have is leaks.

I was offering my take on the issue.

As far as the pump goes, obviously it can have issues other than water gushing out of the hole on the bottom, but really now, given what he said he just did to the cooling system, its most likely that he hasn't bled the air out.

Next time keep your smartass reply to yourself.

Lucient · 09-11-2005, 11:18 AM

One thing that is very important to bleeding the air out that wasnt mentioned is raising the front of the car. Before yiou begin filling the radiator jack up the front of the car and then when you begin filling it do it slowly so that the air can come out. This will work 100% for sure

iansproj240 · 09-12-2005, 01:21 AM

thanks guys everything worked out thanks for the quick replies

09-06-2005, 01:05 AM	#1
iansproj240 Leaky Injector Join Date: Jun 2005 Location: CALIFORNIA Age: 44 Posts: 84 Trader Rating: (0) Feedback Score: 0 reviews	need help car over heating im not sure if its my radiator or my water pump. i just replaced my thermostat so its not that im confused on whats wrong with it. the top hose that goes from the radiator to the engine it gets really hot but the hose underneath does not get hot at all. please i need help thanks 1995 240 sx

09-06-2005, 01:33 AM	#2
The Hamsterball Zilvia Member Join Date: Jul 2004 Location: CA Age: 39 Posts: 290 Trader Rating: (0) Feedback Score: 0 reviews	It's normal for the top hose that leads from the top of the radiator to the engine to get hotter because the water from the radiator is leading away from it and that is where the water from the engine is going through. The lower hose should be cooler since it is leading water from the radiator to the engine. When you replaced your thermostat, did you just fill up the coolant and start her up? If so, you probably have air in the system. Any time you drain coolant and then refill it you have to bleed the air out of the system, since our cars like to trap air so easily (as well as most other cars out their that have a bleeder valve). To bleed your cooling system, let the car sit till the engine is cold. 1. Take off radiator cap. 2. Look at your upper radiator hose. Find the connection to the block. Right in front of the connection to the block, there should be a screw with a sticker on your intake manifold behind the screw saying "HOT" or "Don't touch" or something with japanese writing. 3. Unscrew that screw out of your intake manifold. That screw is your "bleeder screw" 4. Top radiator off. 5. Start engine. 6. Keep radiator cap off until the coolant starts to over flow out of the radiator hole. After coolant starts coming out, fully top off the radiator and put the cap on immediately. 7. Stay in front of your car and watch the bleeder screw hole. Keep the screw off until you see coolant start flowing out of the hole. 8. After coolant starts flowing out of the hole, screw the bleeder screw back in. 9. Turn car off. 10. Wait till car cools down, open radiator cap, top off radiator. You're bled. And it shouldn't over heat, unless if you have a different overheating problem. __________________ White '90 S13 Fastback (SOLD in '07)

09-06-2005, 02:21 AM	#3
sw20>>s14 Post Whore! Join Date: Jan 2005 Location: bay area Posts: 5,656 Trader Rating: (19) Feedback Score: 19 reviews	wut he said...either you didnt properly bleed the system or you installed the thermostat wrong...jiggle valve up __________________ s14\| y34\| 911 gts\| exige s\| 600rr\| r3\| 250r\| 85 girlfriend

09-06-2005, 08:29 AM	#4
iansproj240 Leaky Injector Join Date: Jun 2005 Location: CALIFORNIA Age: 44 Posts: 84 Trader Rating: (0) Feedback Score: 0 reviews	thanks for the quick help. if its the water pump the bottom one would be hot too right. what about if the radiator is clogged how woud you know. Last edited by iansproj240; 09-06-2005 at 08:45 AM..

09-06-2005, 02:09 PM	#6
The Hamsterball Zilvia Member Join Date: Jul 2004 Location: CA Age: 39 Posts: 290 Trader Rating: (0) Feedback Score: 0 reviews	what it tells you to do in the FSM is a FLUSH. That's when you flush out the entiiire system. I'm just giving a procedure to bleed air out. I forget how to check if your water pump is working or not. Don't worry about the water pump for now unless it overheats after bleeding. __________________ White '90 S13 Fastback (SOLD in '07)

09-06-2005, 09:27 AM	#5
aznpoopy Post Whore! Join Date: Mar 2003 Location: New Jersey Age: 44 Posts: 5,013 Trader Rating: (1) Feedback Score: 1 reviews	yay hamsterball is my hero. i was going to do it the FSM way but this seems easier...

09-06-2005, 05:51 PM	#7
aznpoopy Post Whore! Join Date: Mar 2003 Location: New Jersey Age: 44 Posts: 5,013 Trader Rating: (1) Feedback Score: 1 reviews	coming off a bone dry motor (fully drained) i've already topped off the rad, filled it with the heater set to hottest position, with the air bleeder open i know it still has air in it. should i continue using the FSM procedure, or can i do it with your method?

09-08-2005, 03:43 PM	#8
The Hamsterball Zilvia Member Join Date: Jul 2004 Location: CA Age: 39 Posts: 290 Trader Rating: (0) Feedback Score: 0 reviews	dude.. it aint rocket science. If you fully drained it, then there's no need to do the FSM flush procedure. Just bleed the air out and top off the radiator after bleeding. __________________ White '90 S13 Fastback (SOLD in '07)

09-08-2005, 04:01 PM	#9
kazuo Post Whore! Join Date: Aug 2002 Location: Posts: 2,762 Trader Rating: (3) Feedback Score: 3 reviews	You have air in the system (most likely), or you installed the thermo wrong (highly unlikely). Bleed the system and go from there. If the pump was bad, it would be leaking coolant. Good luck

09-11-2005, 11:18 AM	#12
Lucient Zilvia Member Join Date: May 2005 Location: Atlanta Posts: 174 Trader Rating: (0) Feedback Score: 0 reviews	One thing that is very important to bleeding the air out that wasnt mentioned is raising the front of the car. Before yiou begin filling the radiator jack up the front of the car and then when you begin filling it do it slowly so that the air can come out. This will work 100% for sure

09-12-2005, 01:21 AM	#13
iansproj240 Leaky Injector Join Date: Jun 2005 Location: CALIFORNIA Age: 44 Posts: 84 Trader Rating: (0) Feedback Score: 0 reviews	thanks guys everything worked out thanks for the quick replies