After installed MD 5/16" copper spacer
Joined: Aug 2006
Posts: 209
Likes: 0
From: Gainesville, FL
Originally Posted by ISMSOLUTIONS
If you are in the car and turn on the AC - what happens? Do you get air from the vents or not? If you force it to heat, do you still get air and is it hot/warm? Also, is your car completely warmed up when you do this?
Hot coolant is circulated in the system and the AC fans blow over another very small radiator.. That heated air is used to heat the car...so if you have capped of the flow somehow, you would not get much heated air at all.
Have you done anything else new to the car?
Rick
Hot coolant is circulated in the system and the AC fans blow over another very small radiator.. That heated air is used to heat the car...so if you have capped of the flow somehow, you would not get much heated air at all.
Have you done anything else new to the car?
Rick
Even if I wait for 10 or 20 mins to get hot air, im just getting normal air which is not hot nor cold.
But I just checked the coolant fluid tank, it almost reached to MIN.
jeez, guys, he just has air in the coolant system.
1st things 1st: make sure the coolant hoses are plugged in correctly. if you have the copper spacer in place - make sure both coolant hoses (the feed line and the return line) are BOTH connected to the copper in/out feeds and NOT to the original upper plenum connection points.
2nd: you need to bleed air out of the coolant system. you can follow the service manual procedure or the guides on here. the bottom line is that there is a plastic valve towards the rear passenger side of the engine compartment that is designed to allow air to escape from the system.
here is the excerpt from the service manual (formatting from the pdf will be screwed up):
REFILLING ENGINE COOLANT
1. Install reservoir tank, and radiator drain plug.
CAUTION:
Be sure to clean drain plug and install with new O-ring.
If cylinder block drain plugs are removed, close and tighten them. Refer to EM-114, "ASSEMBLY" .
2. Remove air relief plug on heater hose.
3. Fill radiator and reservoir tank to specified level.
Pour engine coolant through engine coolant filler neck
slowly of less than 2 (2-1/8 US qt, 1-3/4 lmp qt) a minute
to allow air in system to escape.
Use Genuine Nissan Long Life Antifreeze/ Coolant or
equivalent mixed with water (distilled or demineralized).
Refer to GI-47, "RECOMMENDED CHEMICAL PRODUCTS
AND SEALANTS" .
When engine coolant overflows air relief hole on heater hose,
install air relief plug with new O-ring.
4. Warm up engine to normal operating temperature with radiator cap installed.
5. Run engine at 3,000 rpm for 10 seconds and return to idle speed.
Repeat two or three times.
CAUTION:
Watch water temperature gauge so as not to overheat engine.
6. Stop engine and cool down to less than approximately 50°C (122°F).
Cool down using a fan to reduce the time.
If necessary, refill radiator up to filler neck with engine coolant.
7. Refill reservoir tank to “MAX” level line with engine coolant.
Radiator drain plug:
: 0.78 - 1.6 N·m (0.08 - 0.16 kg-m, 7 - 14 in-lb)
PBIC0894E
Engine coolant capacity (Approximate)
(with reservoir tank at “MAX” level)
: 8.7 (9-1/4 US qt, 7-5/8 lmp qt)
SMA182B
Reservoir tank capacity (at “MAX” level)
: 0.8 (7/8 US qt, 3/4 lmp qt)
Air relief plug:
: 0.78 - 1.6 N·m (0.08 - 0.16 kg-m, 7 - 14 in-lb)
SMA412B
CO-12
ENGINE COOLANT
8. Repeat steps 3 through 6 two or more times with radiator cap installed until engine coolant level no longer
drops.
9. Check cooling system for leaks with engine running.
10. Warm up engine, and check for sound of engine coolant flow while running engine from idle up to 3,000
rpm with heater temperature controller set at several position between “COOL” and “WARM”.
Sound may be noticeable at heater unit.
11. Repeat step 10 three times.
12. If sound is heard, bleed air from cooling system by repeating step 3 through 6 until engine coolant level no
longer drops.
Clean excess engine coolant from engine.
1st things 1st: make sure the coolant hoses are plugged in correctly. if you have the copper spacer in place - make sure both coolant hoses (the feed line and the return line) are BOTH connected to the copper in/out feeds and NOT to the original upper plenum connection points.
2nd: you need to bleed air out of the coolant system. you can follow the service manual procedure or the guides on here. the bottom line is that there is a plastic valve towards the rear passenger side of the engine compartment that is designed to allow air to escape from the system.
here is the excerpt from the service manual (formatting from the pdf will be screwed up):
REFILLING ENGINE COOLANT
1. Install reservoir tank, and radiator drain plug.
CAUTION:
Be sure to clean drain plug and install with new O-ring.
If cylinder block drain plugs are removed, close and tighten them. Refer to EM-114, "ASSEMBLY" .
2. Remove air relief plug on heater hose.
3. Fill radiator and reservoir tank to specified level.
Pour engine coolant through engine coolant filler neck
slowly of less than 2 (2-1/8 US qt, 1-3/4 lmp qt) a minute
to allow air in system to escape.
Use Genuine Nissan Long Life Antifreeze/ Coolant or
equivalent mixed with water (distilled or demineralized).
Refer to GI-47, "RECOMMENDED CHEMICAL PRODUCTS
AND SEALANTS" .
When engine coolant overflows air relief hole on heater hose,
install air relief plug with new O-ring.
4. Warm up engine to normal operating temperature with radiator cap installed.
5. Run engine at 3,000 rpm for 10 seconds and return to idle speed.
Repeat two or three times.
CAUTION:
Watch water temperature gauge so as not to overheat engine.
6. Stop engine and cool down to less than approximately 50°C (122°F).
Cool down using a fan to reduce the time.
If necessary, refill radiator up to filler neck with engine coolant.
7. Refill reservoir tank to “MAX” level line with engine coolant.
Radiator drain plug:
: 0.78 - 1.6 N·m (0.08 - 0.16 kg-m, 7 - 14 in-lb)
PBIC0894E
Engine coolant capacity (Approximate)
(with reservoir tank at “MAX” level)
: 8.7 (9-1/4 US qt, 7-5/8 lmp qt)
SMA182B
Reservoir tank capacity (at “MAX” level)
: 0.8 (7/8 US qt, 3/4 lmp qt)
Air relief plug:
: 0.78 - 1.6 N·m (0.08 - 0.16 kg-m, 7 - 14 in-lb)
SMA412B
CO-12
ENGINE COOLANT
8. Repeat steps 3 through 6 two or more times with radiator cap installed until engine coolant level no longer
drops.
9. Check cooling system for leaks with engine running.
10. Warm up engine, and check for sound of engine coolant flow while running engine from idle up to 3,000
rpm with heater temperature controller set at several position between “COOL” and “WARM”.
Sound may be noticeable at heater unit.
11. Repeat step 10 three times.
12. If sound is heard, bleed air from cooling system by repeating step 3 through 6 until engine coolant level no
longer drops.
Clean excess engine coolant from engine.
Agree about air in coolant lines causing no heat
Changed my coolant and also tried to run hot air, but none came out. Then i discovered the bleeder valve and bled the coolant and now heat is fine. 
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