Automotive Forums .com - the leading automotive community online! Automotive Forums .com - the leading automotive community online!
Automotive Forums .com - the leading automotive community online! 
-
Latest | 0 Rplys
Go Back   Automotive Forums .com Car Chat > Cadillac > General Discussion
Reply Show Printable Version Show Printable Version | Email this Page Email this Page | Subscription Subscribe to this Thread
 
Thread Tools
Old 07-22-2018, 04:40 AM   #1
yoona
AF Newbie
 
Join Date: Jul 2018
Location: thien tam
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
help

I have a 89 Deville 142000 miles on a 4.5L . I don't know the history of this car. After driving 2-3 miles the Engine Collant/ Fan light comes on. At that point the upper radiator hose is real hot & rock hard, the filler cap is cool to the touch, if I open the filler cap about 1/8th of a turn hot coolant blast into the overflow tank. Do I start with the radiator first or flush the entire system first ? What about the thermostat ?
PS. The coolant fan is working. Any pointers? Thanks Dave
yoona is offline   Reply With Quote
Old 07-22-2018, 05:59 AM   #2
Blue Bowtie
Registered Offender
 
Blue Bowtie's Avatar
 
Join Date: Mar 2006
Location: Rural
Posts: 6,513
Thanks: 6
Thanked 341 Times in 336 Posts
Re: help

If the upper radiator hose is hot it is probably due to coolant flowing. That would indicate the thermostat is open, as it should be.

If the system holds pressure, that would indicate that there are no external leaks.

Since the system builds pressure so quickly, it may indicate the radiator is not rejecting heat as it should, which could be from a partially plugged, dirty, or restricted radiator.

If it has not been done in the past several years, it would be good to drain, flush, and refill the cooling system. Follow the instructions provided with the cooling system flush/cleaning solution. Once refilled with fresh coolant mixture the system can be diagnosed further, if necessary.

It is also important to clean the exterior of the radiator, specifically the fins through which air must flow. It is not uncommon to accumulate debris between the radiator and AC condenser in a vehicle of this age, so this cleaning is even more important.
__________________
Permanent seat assignment on the Group W bench...
Automotive Forums Survival Guide
Blue Bowtie is offline   Reply With Quote
 
Reply

POST REPLY TO THIS THREAD

Go Back   Automotive Forums .com Car Chat > Cadillac > General Discussion

Thread Tools

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



All times are GMT -5. The time now is 05:29 AM.

Community Participation Guidelines | How to use your User Control Panel

Powered by: vBulletin | Copyright Jelsoft Enterprises Ltd.
 
 
no new posts