2003 Nissan 350z
01-29-2019, 05:20 PM
#1
Registered User
Thread Starter
Join Date: Jan 2019
Location: New York
Posts: 5
Likes: 0
Received 0 Likes
on
0 Posts
2003 Nissan 350z
So I’m having a over heating issue. Have bled the system multiple times and changed the thermostat. I don’t have heat until about 2500 rpms. After it over heats too radiator hose is hot bottom is cold but I know it’s not the thermostat because I just put a brand new OEM thermostat in it
01-29-2019, 07:23 PM
#5
I've had the opposite experience, and find these cars very easy to bleed, at least on the later engines.
With the front end raised up a bit, and one of those spill free funnels (I use a lisle) that holds coolant, let the car warm up with the heat on full blast.
Make sure you have the bleeder screw undone almost all the way, (do this before starting the car). Keep adding coolant as needed, and re-tighten the bleeder screw when you get a steady stream of coolant dropping out. Make sure the level in the reservoir is correct also.
The heater should be hot at idle even, as long as the car is close to operating temp.
With the front end raised up a bit, and one of those spill free funnels (I use a lisle) that holds coolant, let the car warm up with the heat on full blast.
Make sure you have the bleeder screw undone almost all the way, (do this before starting the car). Keep adding coolant as needed, and re-tighten the bleeder screw when you get a steady stream of coolant dropping out. Make sure the level in the reservoir is correct also.
The heater should be hot at idle even, as long as the car is close to operating temp.
01-30-2019, 12:56 PM
#6
I suspect the common mistake is people don't know about the bleeder screw or never turn the heat on during the air purging process. It's spelled out in the FSM, but many new owners aren't able to obtain a digital copy of the FSM anymore.
Good tips from Chihuahua.
-Icer
Good tips from Chihuahua.
-Icer
Trending Topics
01-30-2019, 03:21 PM
#8
Did you test the thermostat in boiling water? I can't think of much else that could be a problem, and allow such quick overheating, besides the water pump. But a water pump should give a clear sign such as leaks through the weep-hole.
Are you able to verify the actual coolant temp with something like an OBD2 scanner, and an app such as 'Torque.' Perhaps the coolant temp sensor/where the gauge gets its reading has malfunctioned. Just some more thoughts..
01-31-2019, 06:52 AM
#9
Registered User
Thread Starter
Join Date: Jan 2019
Location: New York
Posts: 5
Likes: 0
Received 0 Likes
on
0 Posts
It’s close to impossible to tell if it’s the water pump on my model z because the water pump is ran of the timing chain which is internal so it would be leaking. I did check the thermostat in boiling water and it opened and closed just fine I pressure tested the cooling system and only lost less than 1 PSI over a 30 minute period. Also bled the system for about 45 minutes.
01-31-2019, 07:15 AM
#10
New Member
You need one of these:
- Place the funnel in the mouth of the radiator and fill to about 1/3 full
- Start the car and let it run for about 30 mins (yes, 30 mins) with heat on full, revving to about 4K every couple minutes
- Make sure the funnel never goes empty during this process!
- Shut the engine off. Leave the funnel in the radiator so there is at least a couple inches of antifreeze in the funnel
- Walk away from the car for about an hour (yes, an hour)
While the engine cools the antifreeze in the funnel will slowly replace the small bubbles of air trapped in the system.
- Place the funnel in the mouth of the radiator and fill to about 1/3 full
- Start the car and let it run for about 30 mins (yes, 30 mins) with heat on full, revving to about 4K every couple minutes
- Make sure the funnel never goes empty during this process!
- Shut the engine off. Leave the funnel in the radiator so there is at least a couple inches of antifreeze in the funnel
- Walk away from the car for about an hour (yes, an hour)
While the engine cools the antifreeze in the funnel will slowly replace the small bubbles of air trapped in the system.
The following users liked this post:
iideadeyeii (01-31-2019)
01-31-2019, 12:53 PM
#12
Registered User
Thread Starter
Join Date: Jan 2019
Location: New York
Posts: 5
Likes: 0
Received 0 Likes
on
0 Posts
Thread
Thread Starter
Forum
Replies
Last Post
frank358fr
Engine & Drivetrain
4
07-13-2013 09:25 PM
arumndark
Buying/Leasing
4
05-23-2008 04:32 PM