Coolant Problems

[busjimby]

I run the car for 20 miles, everything seem OK. The bottom radiator coolant pipe is cold, ie seems no circulation? The other large coolant pipe is hot. Is this normal?
busjimby

[Dacman]

Hi,
I think it goes something like this..........
Hot water enter radiator at the top, this gets cooled as its flows down through the radiator and cool water exits at the bottom. So the top hose should be hot and the bottom should be cool.

Are you getting any problems? coolant loss or over heating. You can check if your coolant fan works just do a quick search, basically if you turn your air con on the fan should start.

hth and i might be wrong

dac

[Dacman]

oh and welcome to the club
It would be benificial to put your engine type and location in your profile it does help to answer some questions.

dac

[chrissyboy]

hi you have an air lock in the system ,you will need to bleed the system and check the pipes for any blockage then refill making sure you have re pressured it and making sure that all the air is out the system. .all the hoses should be hot .failure to sort it now could lead to head gasket failure ,there are some posts on here on how to do it .

[Dacman]

Just had a think, is the heater working? If that is blowing hot would that not eliminate airlocks?

[chrissyboy]

Originally Posted by Dacman

Just had a think, is the heater working? If that is blowing hot would that not eliminate airlocks?

my heater was blowing hot with the same problem all pipes have to be hot ,maybe the matrix that needs unblocking .

[Dacman]

Originally Posted by chrissyboy

my heater was blowing hot with the same problem all pipes have to be hot ,maybe the matrix that needs unblocking .

Provided there are NO other symptoms it could be worth the OP having the coolant system flushed and changed. This would remove the possibility of air leaks and blockages. But dont quote me

[Jules]

Monitor your engine temp
DAsh Diagnostics and tell us your findings :............

How to access 75/ZT diagnostics and car data via the Instrument Pack (IPK)
Rover 75/MG ZT - Diagnostics access via the Instrument Pack

To enable the OBC diagnostics:

a) Press and hold the trip reset button.
b) Put key into ignition switch and turn to KLR (Ignition switch
position #1)
c) Your LCD display will show something like this "test 1.-"
d) Press the reset button till you get to "test 19.-". (19.0 unlocks all
the features)
e) Wait for display to show "Log I -off" and press the reset button
f) With no delay press Trip Reset several times to select one of the
following functions:

1 Car, Engine and cluster data

1.0 VIN serial number
1.1 K-number
1.2 Cluster Part #
1.3 Coding (04)/diagnosis (52)/bus index (10)
1.4 1200 Week (12)/year of manufacture (2000)
1.5 09_160 Hardware (09) and software # (16.0) of cluster
1.6 Injection Status-number of cylinders-motor number

2.0 2 Cluster System Test - Activates the gauge drivers, indicators and
LEDs to confirm function

3 Service Inspection (SI) Data
3.0 Used fuel in liters since last SI
3.1 Periodic inspection days; elapsed days (since last SI)

4 Momentary Consumption
4.0 Instant fuel consumption - 0145=14.5 liters/100km
4.1 Instant fuel consumption - 0018=1.8 l/Hour

5 Distance Gone Consumption
5.0 Average mileage; 082=8.2 liters/100km
5.1 Calc. km to refuel (momentary distance to go)

6 Fuel Level sensor inputs in liters
6.0 Fuel level averaged; 109330 - Left half sensor input=10.9 liters;
Right sensor input=33.0 liters
6.1 Total tank level averaged; 0439 - vlgs 6.0: 10.9+33.0=43.9 liters
6.2 Indicated value and diagnostics:
last digit: 1 - both sensors ok; 2 - sensor error; 3 - signal error
- no display

7 Temperature and Speed
7.0 021+ Coolant/Engine temperature (21C)
7.1 130 Ambient/Outside temperature - chg met 5 pts. 125/130/135
7.2 Engine speed / Current RPMs 1/min
7.3 Vehicle speed / Current Speed in km/hour

8 Values of 7.0 bis 7.3 in HEX form

9 Battery
9.0 140 Battery Voltage - 140 = UB 14.0v

10.0 Country code

11.0 Unit code

12.0 Not used

13.0 Gong test

14.0-14.4 Error memory: if 000000 no error in memory

15.0 - 18.0 not used

19 Lock Status; unlocks functions in range 3-18
19.0 L-On/L-Off Unlock: press button when "L-Off"

20.0 Correction Factor for OBC Fuel Consumption
Formula for the Correction Factor:
Indicated Consumption X 1000 / Measured Consumption = Factor (4321)
Press Reset button to begin setting the of the first (1) digit - press
reset when the right digit appears
20.1 Setting of the second (2) digit
20.2 Setting of the hundred (3) and thousand (4) digit
20.3 Store and Display the Correction Factor

21.0 Software Reset; reset OBC settings

[T-Cut]

Originally Posted by busjimby

I run the car for 20 miles, everything seem OK. The bottom radiator coolant pipe is cold, ie seems no circulation? The other large coolant pipe is hot. Is this normal?

I say so. If nothing untoward happens over a 20 mile run, I'd say you're probably worrying unnecessarily. Try repeating the excercise with the diagnostic screen running on coolant temperature. That will tell you far more than the feel of the hoses.

Read this: http://www.the75andztclub.co.uk/foru...temperature%22

TC

EDIT: Julian snap!

[Jules]

Heh
Can you hold the Fort TC?
I've got to go & have a clear out of the workshop before rain arrives !
Cars have been fitting into the service bay less & less due to junk.
Final straw yesterday when car would only nose in up to the bonnet!