1986 4Runner fluctuates temp???
11-03-2009, 04:25 PM
#1
Registered User
Thread Starter
iTrader: (1)
Join Date: Feb 2009
Location: Ft. Worth, TX
Posts: 41
Likes: 0
Received 0 Likes
on
0 Posts
1986 4Runner fluctuates temp???
I have an 1986 4Runner that I just noticed will start to get hot, then cool off. It never overheats, but the temp gauge just keeps fluctuating instead of staying at one temp. Anyone else have this happen? I wonder if its my thermostat going out???? Any help is appreciated. Thanks.
Dan
Dan
11-03-2009, 07:15 PM
#3
Registered User
If the thermostat doesn`t fix the problem, try replacing the temp gauge sending unit, when they go bad it can cause the temp gauge to read wrong or bounce around.
11-04-2009, 05:53 AM
#4
Registered User
Join Date: Apr 2009
Location: Suisun City, California
Posts: 535
Likes: 0
Received 0 Likes
on
0 Posts
An other thing that can cause it but I have yet to see in a toyota is having the propeller on the water pump so rotted or corroded that it is not moving the water properly. The symtoms are normally it will get hotter at an idle/low rpms and cools down at high rmps.
If your shroud is missing it will heat up at a stop/low speeds and cool at high speeds.
I have also read that there is a clutch on the fan that could cause this if it was starting to go.
If your shroud is missing it will heat up at a stop/low speeds and cool at high speeds.
I have also read that there is a clutch on the fan that could cause this if it was starting to go.
11-04-2009, 06:47 AM
#5
Registered User
Join Date: Jul 2009
Location: Canada
Posts: 5
Likes: 0
Received 0 Likes
on
0 Posts
i have sort of the same problem on my 91 4runner 3.0 when im cruising shes fine but if im stopped in traffic the gauge goes up to hot but when i get going it usually cools down. another question when i shut it off and it has cooled down i look in my rad and there is no coolant in there and im not sure where its going as i can see no visable leaks or anything and my head gasket was done at 300000 kms and im at 350000kms so i dont think its burning it or anything. I also have duct tape on my air intake tube and my friend was looking and someone said that my truck could be running too lean and burning hot?? not sure what to do .. PLEASE HELP!!
sorry for the long post :s
sorry for the long post :s
11-04-2009, 04:41 PM
#6
Registered User
Join Date: Apr 2009
Location: Suisun City, California
Posts: 535
Likes: 0
Received 0 Likes
on
0 Posts
i have sort of the same problem on my 91 4runner 3.0 when im cruising shes fine but if im stopped in traffic the gauge goes up to hot but when i get going it usually cools down. another question when i shut it off and it has cooled down i look in my rad and there is no coolant in there and im not sure where its going as i can see no visable leaks or anything and my head gasket was done at 300000 kms and im at 350000kms so i dont think its burning it or anything. I also have duct tape on my air intake tube and my friend was looking and someone said that my truck could be running too lean and burning hot?? not sure what to do .. PLEASE HELP!!
sorry for the long post :s
sorry for the long post :s
11-04-2009, 06:11 PM
#7
Registered User
Thread Starter
iTrader: (1)
Join Date: Feb 2009
Location: Ft. Worth, TX
Posts: 41
Likes: 0
Received 0 Likes
on
0 Posts
Thanks guys, it is not an issue of speed or idle. It does this as I am traveling at a constant rate of speed. I am guessing it is the thermostat, I will swap it soon and see.
Trending Topics
Thread
Thread Starter
Forum
Replies
Last Post
RedRunner_87
95.5-2004 Tacomas & 96-2002 4Runners (Build-Up Section)
84
06-01-2021 01:51 PM
nanhodges2733
86-95 Trucks & 4Runners
16
05-29-2020 03:28 PM
Poncho0206
95.5-2004 Tacomas & 96-2002 4Runners
3
07-10-2015 06:21 PM
19864runner, 1990, 4runner, 86, bad, fluctuates, gauge, head, sender, sending, temp, temperature, toyota, unit, water
