cooling problem
#1
Registered User
Thread Starter
Join Date: Dec 2006
Location: Albuquerque, New Mexico
Posts: 386
Likes: 0
Received 0 Likes
on
0 Posts
cooling problem
My 4runner has the 3.4L out of a 96 Tacoma, so i thought i would post this here.
I changed the radiator (the old one was smashed up pretty bad and leaking so probably wasnt cooling as well as it should have.) Since i changed the radiator, i dont think my coolant is circulating through the radiator. The heater blows HOT and all heater lines get hot, so i know water is flowing through them. The UPPER radiator hose (where my temp gauge is located) gets warm, and the upper portion of the radiator gets warm. BUT the LOWER radiator hose stays cool.
Its like the thermostat isnt opening maybe? Will the heater core still get water pumped to it without the thermostat opening? The thermostat was working fine with the other radiator, and i just got the water pump replaced less that 100 miles ago...
and ive been burping the system all day and cant seem to get any more air out of it
any ideas what the problem may be?
I changed the radiator (the old one was smashed up pretty bad and leaking so probably wasnt cooling as well as it should have.) Since i changed the radiator, i dont think my coolant is circulating through the radiator. The heater blows HOT and all heater lines get hot, so i know water is flowing through them. The UPPER radiator hose (where my temp gauge is located) gets warm, and the upper portion of the radiator gets warm. BUT the LOWER radiator hose stays cool.
Its like the thermostat isnt opening maybe? Will the heater core still get water pumped to it without the thermostat opening? The thermostat was working fine with the other radiator, and i just got the water pump replaced less that 100 miles ago...
and ive been burping the system all day and cant seem to get any more air out of it
any ideas what the problem may be?
#3
Registered User
Thread Starter
Join Date: Dec 2006
Location: Albuquerque, New Mexico
Posts: 386
Likes: 0
Received 0 Likes
on
0 Posts
THe thing is the dash temperature guage doesnt work (ever since the 3.4 swap i cant get it to work) so i have an in-line temperature sensor in the upper radiator hose to an aftermarket gauge. It will get to around 190* at idle and stays there, but the lower radiator hose stays cold....
#4
Registered User
Thread Starter
Join Date: Dec 2006
Location: Albuquerque, New Mexico
Posts: 386
Likes: 0
Received 0 Likes
on
0 Posts
replaced the thermostat and same thing. Got an OBD II reader, and it says my coolant temp gets to 192*-194* and hovers around there....but the bottom radiator hose is cool...
Am i overthinking this? How "hot" should the bottom radiator hose get compared to the top one?
Am i overthinking this? How "hot" should the bottom radiator hose get compared to the top one?
Last edited by pepsibluefloat; 05-08-2011 at 06:04 PM.
#6
Registered User
Join Date: Oct 2012
Location: springfield, ma
Posts: 5
Likes: 0
Received 0 Likes
on
0 Posts
pepsibluefloat: i know this is an old thread but I'm having exactly the same problem! the bottom hose feels like its outta the fridge. I get the same impression, there's not enough/any flow, whats more: in my case, I've had 2 water pumps fail since the repair.(less than 1000 miles) any suggestions???
Trending Topics
#8
Registered User
Join Date: Oct 2012
Location: springfield, ma
Posts: 5
Likes: 0
Received 0 Likes
on
0 Posts
Yeah I started with that. I even put a fail safe thermostat after the rebuild. New water pump, radiator, fan clutch nd I flushed the block. And I'm getting ordinary temp readings on the dash. Thanks for the reply.
#10
Registered User
Join Date: Oct 2012
Location: springfield, ma
Posts: 5
Likes: 0
Received 0 Likes
on
0 Posts
Afraid not, unfortunately my third water pump just started leaking. As far as flow is concerned, I'm getting full flow however I'm blowing water pump seals like its going out of style. Very frustrated!!! -_-
Thread
Thread Starter
Forum
Replies
Last Post
the1998sr5
95.5-2004 Tacomas & 96-2002 4Runners
15
07-14-2020 08:35 PM
Avenged
95.5-2004 Tacomas & 96-2002 4Runners
4
07-09-2015 07:55 AM