2002 Nissan Sentra No Heat Overheating

2002 NISSAN 240SX
Avatar
MAD6920
  • MEMBER
  • 5 POSTS
i have a 2002 nissan gxe milage is 56,793 that has an overheating and no heat problem when driving i have no heat and vehicle overheats less than an hour on road ive changed thermostat flushed heater core and refilled raidiator and i get heat for a few minutes then it blows cold air then temp. gauge shoots up to red then overheats please help!!!!!!!!!
Jan 2, 2007 at 11:58 AM
Avatar
RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Remove the Stat and see what happens to your overheating problem

Do you hear the cooling fan? when engine is idling?
Jan 2, 2007 at 12:58 PM
Avatar
MAD6920
  • MEMBER
  • 5 POSTS
what is the stat?? and yes the fan does come on when overheating but not when idle
Jan 2, 2007 at 11:52 PM
Avatar
MAD6920
  • MEMBER
  • 5 POSTS
if u mean the thermostat i will do that and see what happens but i do know it works i put it into a pot and boiled it and it did open
Jan 3, 2007 at 12:01 AM
Avatar
MAD6920
  • MEMBER
  • 5 POSTS
i did take out the thermostat and filled the raidiator drove the car i do get heat now and i notice the temp gauge stays in the cold will that cause a problem and if not is it ok to leave it that way during the summer too???
Jan 3, 2007 at 11:17 AM
Avatar
RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Its your choice-Remember the computer has to read the temperature from the coolant temperature sensor for other purposes such as fuel delivery and tranny shifting/overdrive etc. Best bet is just get another T-Stat with the correct Temperature for your model.

The final decision is yours-Good Luck
Jan 3, 2007 at 11:38 AM
Avatar
MAD6920
  • MEMBER
  • 5 POSTS
i have just one more question i was reading some of the other posts and i seen somewhere about a heater control valve does my car have one and if so were is it??

oh and thanks for the help :D
Jan 3, 2007 at 6:10 PM
Avatar
RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Should be on the heater hose before it goes in the heatercore.
Jan 3, 2007 at 8:27 PM
🔧 Tools & Auto Repair Parts
Find automotive tools, diagnostic equipment, and replacement parts for your next repair.
Shop on Amazon →
Paid affiliate link. As an Amazon Associate, we earn from qualifying purchases.

Suggested Repair

Install a new thermostat with the correct opening temperature for this model rather than leaving it out. The coolant temperature reading is needed for fuel delivery and transmission shifting. If equipped, the heater control valve is on the heater hose before the heater core.

Conversation Summary

A 2002 Nissan GXE overheated and lost cabin heat after a thermostat replacement, heater-core flush, and radiator refill. Heat returned briefly, then the gauge climbed to red. The cooling fan ran only when overheating, not at idle. With the thermostat removed, heat returned but the gauge stayed cold. The expert advised fitting a correctly rated thermostat because the computer uses coolant temperature for fuel delivery and transmission control, and said a heater control valve, if present, is on the heater hose before the heater core.

Related Repair Questions

Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Ask a new question

Frequently Asked Problems for This Vehicle