96 SE blowin cold air only
#1
Junior Member
Posts like a Ricer Type-R
Thread Starter
Join Date: Nov 2008
Posts: 21
Likes: 0
Received 0 Likes
on
0 Posts
96 SE blowin cold air only
i just got this 1996 bonneville with 118,000 miles on it and for some reason every now and then the heat turns to cold air and it wont blow hot air out even when its warmed up. woundnt that be a heater core problem??????
#4
Retired Senior Admin
Expert Gearhead
Join Date: May 2006
Location: Sheboygan Wisconsin
Posts: 29,661
Likes: 0
Received 28 Likes
on
24 Posts
This is a bit outside my area, but I seem to remember there being a valve under the dash, near the glove box I think. And that controls how much hot or cold air enters the car. I could be way off on this, I'm just not sure. But it'* worth a look. I've never had this problem myself so I never looked that close.
#6
Senior Member
Posts like a Supercharger
Check the coolant level in the radiator, not in the reservoir tank. If you have an air bubble in the radiator, the heater core has air in it and you'll get erratic heat/coolant flow in it.
If the radiator is full, when the car is fulled warmed up meaning the lower radiator hose has warm water circulating, run the motor at 2500 for 10 seconds and then repeat that 4 more times. That shoud get the air out of the heater according to the service manual. Then bleed the air at the thermostat housing using the little screw on top.
If the radiator is full, when the car is fulled warmed up meaning the lower radiator hose has warm water circulating, run the motor at 2500 for 10 seconds and then repeat that 4 more times. That shoud get the air out of the heater according to the service manual. Then bleed the air at the thermostat housing using the little screw on top.
#7
Junior Member
Posts like a Ricer Type-R
Join Date: Oct 2008
Location: West Michigan
Posts: 17
Likes: 0
Received 0 Likes
on
0 Posts
I have a 1999 SE with now 117,400 miles and it seems to only blow mildly warm air. I just changed the UIM and LIM gaskets and refilled the radiator and bled the lines. I will try cycling the motor to 2500 RPM and then bleed the line again.
But would air in the system also cause the temp gauge on the dash to cycle between 195 and 160 degrees constantly while driving 30+ miles?? Could this be a bad thermostat? I already replaced the thermostat once when it was stuck open right after I bought the car 2 months ago.
But would air in the system also cause the temp gauge on the dash to cycle between 195 and 160 degrees constantly while driving 30+ miles?? Could this be a bad thermostat? I already replaced the thermostat once when it was stuck open right after I bought the car 2 months ago.
#9
Junior Member
Posts like a Ricer Type-R
Join Date: Oct 2008
Location: West Michigan
Posts: 17
Likes: 0
Received 0 Likes
on
0 Posts
Hmmm the guy at NAPA could have grabbed the wrong one off the shelf...
I knew I should have just bought another new t-stat to install when it was tore apart.
Thanks
I knew I should have just bought another new t-stat to install when it was tore apart.
Thanks