over heating and heater - YotaTech Forums



95.5-2004 Tacomas & 96-2002 4Runners 4th gen pickups and 3rd gen 4Runners

over heating and heater

Reply
 
LinkBack Thread Tools Search this Thread
Old 01-09-2018, 06:41 PM   #1  
Registered User
Thread Starter
 
Join Date: Jan 2018
Posts: 1
over heating and heater

My 4runner started over heating on me a few weeks ago.. it would only over heat when at idle. (checked the fan cluch it was good) it has not over heated on me in a while but i also have not been sitting for a long period of time... i was sitting at a stop light and i noticed that the heater was blowing cold, i started to drive within seconds the heater was hot... but when i stoped at another light took about 20 sec and if was blowing cold again...??? any thoughts
toadsQ is offline   Reply With Quote
Old 01-09-2018, 11:07 PM   #2  
Registered User
 
Malcolm99's Avatar
 
Join Date: Dec 2015
Location: Ontario, Canada
Posts: 314
First thought is thermostat, I would go OEM for this item although expensive.
Malcolm99 is offline   Reply With Quote
Old 01-10-2018, 05:36 AM   #3  
Registered User
 
RAD4Runner's Avatar
 
Join Date: Mar 2012
Posts: 5,349
Yes, start with Thermostat AND a "heavy-duty" cooling system flush.
try toyotapartsdeal.com for OEM at great prices.

Flush like it says here on the bottle of Prestone Cooling System, Flush solution:



Make sure you also back-flush the whole system.
RAD4Runner is offline   Reply With Quote
Old 01-10-2018, 08:01 AM   #4  
Contributing Member
 
Marc's Avatar
 
Join Date: Sep 2003
Location: Winnipeg, MB, Canada
Posts: 1,185
Have you checked the fluid level in the rad and overflow bottle?
Marc is offline   Reply With Quote
Old 01-10-2018, 08:57 AM   #5  
Registered User
 
old87yota's Avatar
 
Join Date: Jun 2013
Location: Portland, Oregon, USA
Posts: 1,062
Quote:
Originally Posted by Marc View Post
Have you checked the fluid level in the rad and overflow bottle?
^^ I would start here, the basics. The engine can't stay cool with low coolant.

What is the condition of the coolant? Nice and clean? Full of rusty gunk?

old87yota is online now   Reply With Quote
Old 01-10-2018, 10:38 AM   #6  
Registered User
 
fierohink's Avatar
 
Join Date: Apr 2005
Location: Frederick, MD
Posts: 939
^2 for checking coolant level, saying your heater blows cold and then hot once you're moving is a flag-waving indicator of low coolant. Does your rig have rear heat? The lines that run from the front to the back are prone to corrosion and leaking without showing signs up front.

Next, what is the mileage on your timing belt and water pump? They really should be replaced every 100k miles or so. The water pump is hidden behind some covers and it is difficult to determine if it is leaking.
fierohink is offline   Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
1985 4Runner JohnnyCanuck 84-85 Trucks & 4Runners (Build-Up Section) 25 04-20-2018 06:38 AM
Pulling Heater Core GodwinAustin Pre 84 Trucks 1 01-09-2018 11:51 AM
Heater Poppie51 86-95 Trucks & 4Runners 20 01-07-2018 06:20 PM
22re freeze plug heater sweitzerworks 86-95 Trucks & 4Runners 3 01-04-2018 11:06 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -8. The time now is 05:12 PM.


2017 InternetBrands, Inc.
We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: