Heating only works when accelerating

The G-Series Tuning Forum is the place to discuss G35/G37 performance modifications and mechanical repair.
ZetaSigma1036
Posts: 1
Joined: Sun Apr 22, 2018 11:05 pm
Car: 2004 Infiniti G35

Heating only works when accelerating

Postby ZetaSigma1036 » Mon Apr 23, 2018 10:48 pm

2004 G35
I noticed I had a coolant leak when I saw smoke from it burning off the engine. I took it into one mechanic only for them to fix stuff other than the main issue and I didn't realize right away (unless they did and I somehow sprung another leak). The heating goes out about 300 miles later and I looked online that it could be low coolant. I look in the reservoir and couldn't see a drop. I filled it up to the max line and things seemed fine. Two days later the heating stopped working again and coolant was burning off of the engine again. I take it to a second mechanic and they fix the leak only for me to notice after they closed that the heating still doesn't work right. It only cranks out heat when I accelerate whether it's in drive or parked. While idle it slowly turns to cool and then frigid air. I had been thinking it was a clogged heater core but the vehicle has 167,000 miles and the system was flushed at 125,000. Bad heater core or air in the system?


User avatar
telcoman
Posts: 5529
Joined: Sat Jul 08, 2006 11:30 am
Car: 2016 Q70 Bye 2012 G37S 6 MT w Nav 94444 mi bye 2006 Infiniti G35 Sedan 6 MT @171796mi. 2013 Altima 2.5SV
Location: Central NJ

Re: Heating only works when accelerating

Postby telcoman » Tue Apr 24, 2018 4:44 am

^
You might want to follow the troubleshooting steps in the FSM
Pressure test your cooling system
Replace radiator cap
Air in cooling system?
defective or failing water pump?
Incorrect coolant?
Replace hoses and clamps

Telcoman

User avatar
audtatious
Moderator
Posts: 36825
Joined: Sun Oct 27, 2002 5:31 pm
Car: 2017 Q60 Red Sport - 2014 Q50s AWD
Location: Stalking You
Contact:

Re: Heating only works when accelerating

Postby audtatious » Tue Apr 24, 2018 6:05 am

Could be an air bubble in the system

macgiver
Posts: 616
Joined: Wed Jul 04, 2007 10:21 am

Re: Heating only works when accelerating

Postby macgiver » Tue Apr 24, 2018 7:19 am

mac, isn't that a VQ motor? Those probably got the water pump INSIDE the timing case , in the crankcase oil , and I believe the design is a DOUBLE outer O-ring (possibly double shaft seal too ) and when 1st shaft seal leaks , it dribbles in-between - the center both large outer o-rings - down and out to the pavement through a "dribble passage " in block.Very expensive time consuming fix. Couldn't have been done by mechanic yet , going by the EXPLANATION , and probably "steams-off-dry" quickly and not so noticeble yet causes all the above problems! :lolling:Water pump drizzle -drippi 'n :tisk: Constantly causing a low coolant level, G's accelerating allows coolant to temporarily fill the heater! :facepalm:


Return to “G35 and G37 Engine, Drivetrain & Tuning”