Cold lower hose

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stag888

stag888

Active Member
Posts
113
Location
Bromley , Kent
Hi
My Series 3 has started to running hotter , used to run dead centre , now pushing up close to the red . started to check a few things
  • Checked previous posts for some guidance
  • Replaced thermostat , did test old one , and it certainly didn’t open as much as new one
  • Checked rad , disconnected bottom hose , used the garden hose and water flowed straight through, that seems fine
  • Heater works , hot water makes it through heater pipes in & out & it blows as warm as used to
  • However the bottom hose remains dead cold , I run it for 15/20 minutes , temp goes up & whilst top is hot , it’s that that bothers me, and makes me question flow
Starting to think the water pump may be u/s , but before I go out and change that I’m keen to check I haven’t overlooked anything obvious .
Any guidance much appreciated
Cheers Steve
 
Fan belt tight/good ? even if spinning were it loose or very worn it this can result in it slipping and not pumping properly.
 
With the rad cap off and engine up to temp you can normally see the flow coming into radiator if series type.
 
Hi
OK thanks I'll give that a go tonight, I suppose that's exactly what I was asking how can I telI I have circulation. I have a sinking feeling that there is little flow or movement . I was also thinking of disconnecting the fan belt just to check the pump , although it's not leaking was keen to see if there is any play, noise or friction , plus also planning to carefully disconnecting the heater return pipe whilst running to see if I had flow / pressure .
Found the attached which helped my thought process


car-engine-cooling-system-diagram-prestone-release-imagine-so-630-427.png
 
Well checked water pump , no wobble, spins relatively smoothly , checked rad with cap off and yes the water does move , and increases in line with revs , doesn't seem like a huge amount , but then not sure how much the pump is expected to displace , so it is working . Temp still goes up to close to the red after 15/ 20 minutes of idle , and bottom hose still cold . I think next thing on the cheap check list will be the temp sender , and once I've got a replacement battery for my temp gauge I'll check the block temp .
 
For getting the bottom hose warm I think you need to take it for drive, just running for 15/20 min's is not enough, could be temp sender playing up or voltage regulator. Is the fuel gauge behaving?
 
I should get the temp sender in at the weekend , and can take it for a longer run then , let’s see what does .... fuel gauge seems to be behaving , so perhaps not voltage regular . Will see the weekend brings before I start thinking head gasket
Cheers
 
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