Jump to content
Sign in to follow this  
Rohan

1987 735i electrical probs - pls help

Recommended Posts

I have a 87 735i with some electrical problems.:

1 - Heaters seem to have a mind of their own - turning itself on and off as it likes and unable to switch off.

2 - Cruise control sometimes stops working during driving (not during use, but after braking and trying to turn it back on again)

3 - Dash lights sometimes fade in and out (not fully)

Could this be a computer problem???

Any help much appreciated :)

Share this post


Link to post
Share on other sites

heater? or the fan blower??

if its the fan blower its probably the fan control unit. had the same thing on my cousins e46.. would just blow on high randomly and then turn itself off randomly.

Share this post


Link to post
Share on other sites

heater not turning off can be the valves at the rh back of the engine bay,they can stick open letting hot water always circulate through heater.Sometime a few sharp raps on the valves can free them but they will stick again.This can also be the cause for "variable" operation

Share this post


Link to post
Share on other sites

heater? or the fan blower??

if its the fan blower its probably the fan control unit. had the same thing on my cousins e46.. would just blow on high randomly and then turn itself off randomly.

Hey thanks for your reply, unfortunately its both lol

Share this post


Link to post
Share on other sites

Hey thanks for your reply, unfortunately its both lol

me and my cousin had to replace the control unit.. cant remember how much it was... but i think it was 200 bucks new :(

Share this post


Link to post
Share on other sites

I have a 87 735i with some electrical problems.:

1 - Heaters seem to have a mind of their own - turning itself on and off as it likes and unable to switch off.

heater valves fail , replace with good 2nd hand unit , fan speed controllers (sword) fail, that will shut the whole system down if the fan stops

2 - Cruise control sometimes stops working during driving (not during use, but after braking and trying to turn it back on again)

check brake switch is not coming on

3 - Dash lights sometimes fade in and out (not fully)

maybe replace the dial that adjusts teh brightness they get a bit worn over time .

Could this be a computer problem???

Any help much appreciated :)

also check fusable link near positive battery terminal they fail too.

that will stop , wipers , windows , heater , radio etc from working

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
Sign in to follow this  

×
×
  • Create New...