home register FAQ memberlist calendar

Go Back   Turbobricks Forums > Mechanical > maintenance & nonperformance

Reply
 
Thread Tools Display Modes
Old 11-06-2021, 06:54 PM   #1
LeedomtoFreedom
Board Member
 
LeedomtoFreedom's Avatar
 
Join Date: Oct 2017
Location: Ingleside
Default Rear defroster woes

Getting ends tied before winter hits.

The rear defroster does not seem to work.

Tested with a laser temp gauge and it doesn't show any change. The switch receives and sends power to the relay, the relay clicks and sends out the 12v but the filament doesn't seem to heat up. I can't directly check the filament in the window due to tint.

Need some advice before I can't see.
Thanks
__________________
Quote:
Originally Posted by freevolvos View Post
chickens like yogurt but I hate it, yet I like eggs, should I turbo or n.a.a chicken? Do chickens spool? Thanks
81 264 - Sold
90 245 - Painted and looking good
LeedomtoFreedom is offline   Reply With Quote
Old 11-06-2021, 11:29 PM   #2
283SD
Board Member
 
Join Date: Mar 2008
Default

What model?, if it's a wagon, check the wires at the hinges.
283SD is offline   Reply With Quote
Old 11-06-2021, 11:33 PM   #3
LeedomtoFreedom
Board Member
 
LeedomtoFreedom's Avatar
 
Join Date: Oct 2017
Location: Ingleside
Default

90 240 wagon. I'll check
LeedomtoFreedom is offline   Reply With Quote
Old 11-07-2021, 11:05 AM   #4
B3rnard
Newbie
 
Join Date: Feb 2020
Location: The Netherlands
Default Defrost relay

Hi LeedomtoFreedom,

Doing EXACTLY that right now, before winter. Mine's 1991 245, switch is OK, but which relay did you get to? I have 3 behind the console, of which 1 is for the turn signals.
Do you have a part# or pic from the relay in question? Cheers! B.

Hinges checked, did those this summer. Tint film also in the way.
B3rnard is offline   Reply With Quote
Old 11-07-2021, 08:03 PM   #5
LeedomtoFreedom
Board Member
 
LeedomtoFreedom's Avatar
 
Join Date: Oct 2017
Location: Ingleside
Default

Quote:
Originally Posted by B3rnard View Post
Hi LeedomtoFreedom,

Doing EXACTLY that right now, before winter. Mine's 1991 245, switch is OK, but which relay did you get to? I have 3 behind the console, of which 1 is for the turn signals.
Do you have a part# or pic from the relay in question? Cheers! B.

Hinges checked, did those this summer. Tint film also in the way.
It's in the drivers footwell. Mine's probably in a different location than yours since I did a manual swap and didn't remember where they went. It's not the silver headlight relay. It's a tall white box relay with 4 pins missing a central pin. When you turn the defroster on you can hear it click on.

was looking for some wiring location info since there really isn't anything I've seen.
LeedomtoFreedom is offline   Reply With Quote
Old 11-07-2021, 08:34 PM   #6
2 old for this
Board Member
 
Join Date: Mar 2018
Default

Use a test light to check voltage at the grid and ohm meter for ground at the other side.
2 old for this is offline   Reply With Quote
Old 11-08-2021, 01:29 PM   #7
dl242gt
My car is fun hp club
 
dl242gt's Avatar
 
Join Date: Jun 2002
Location: S NJ, a suburb of Phila.
Default

The Bentley manual has relay locations as does the greenbooks. Try to find a print version of the wiring diagram greenbook for 1990. They are very helpful with this kind of stuff.
__________________
Dave,
1982 242 turbo. 338k miles. MVP coilovers and 3" exhaust. Flowed 405 with a V15. Cossie turbine housing with upgraded compressor housing. 90+, IPD remote oil filter. Some other goodness, too. Been lots of fun over 25 years. Restored in 2k. Now ready for a 2nd restoration.

1993 245 Classic, 435k miles, enem V15. IPD bars and chassis braces. Simons sport exhaust from Scandix. sbabbs ezk chip. Been a good road warrior. Genuine Volvo rebuilt leaky M47.
dl242gt is online now   Reply With Quote
Old 11-08-2021, 06:38 PM   #8
LeedomtoFreedom
Board Member
 
LeedomtoFreedom's Avatar
 
Join Date: Oct 2017
Location: Ingleside
Default

Okay popped off the inside bevel of the hatch window where the cable ends meet the heating element. Getting 12v to the hotside and ~.18 v on the ground side. This seems normal as the heating element is a big resistor. What gives. How long does this thing take to heat up?
LeedomtoFreedom is offline   Reply With Quote
Old 11-08-2021, 08:58 PM   #9
283SD
Board Member
 
Join Date: Mar 2008
Default

From a cold start on my '90 wagon, about a 5 mile drive, by then I was at the shop that I did contract work for.
283SD is offline   Reply With Quote
Old 11-18-2021, 12:47 PM   #10
Lazarus
Board Member
 
Join Date: Jan 2005
Location: Seattle, WA
Default

OK, you have determined that battery voltage is getting to the rear connector. Separate the connector (engine off) and check resistance of the heating grid. I'm guessing it should be 1 ohm or less. Typical failure points are where the wires connect to either end of the grid.
-Lazarus
Lazarus is offline   Reply With Quote
Reply

Thread Tools
Display Modes

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 On

Forum Jump


All times are GMT -4. The time now is 07:42 PM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.