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Radiator Replacement - How to. 12 years 3 months ago #175

I had to replace the radiator on our MGF recently.
Well I took some pictures at the time, so here goes on a How-to.

Firstly, A Warning- Don't mess with the cooling system unless you have confidence in your abilities. Also you will encounter hot things and sharp things and may burn yourself, scratch or cut yourself, or break things. It's not my fault.

OK, the radiator is well hidden beneath the slam panel, under the bonnet.
To begin with, I found it easier to remove the spare wheel and tool bag before I started. I also removed the black plastic shielding, it is held in with four plastic nuts and a plastic screw as I wanted access to the two coolant hoses. ( I had a cunning plan, explained later.) I also shifted the washer bottle out of the way.

The radiator is held to the panel by the two black metal and rubber plates, remove the four bolts and take off the brackets.

To remove the slam panel you then need to take out the other seven 10mm bolts.

Then remove the five screws. To get to the back of the (annoying) two nuts and bolts, you can ease the plastic front away enough to get a spanner to hold the bolts.

Using my new Aldi arc welder, I tacked the bolts to the bracket to make re-fitment easier. (If you don't have a welder, replace the two bolts with slightly longer ones, so that you can tighten a nut down onto the bracket to hold the bolt(s)before eventually replacing the slam panel and tightening the original nuts.)
It is also possible to rplace the loose nut and bolt by fiting two nutserts into the bracket. Then you just bolt into the fitted nuts.
Nutsert and fitting tool.

The panel will then lift away. You do not need to touch the bonnet catch and release cable. With the spare wheel removed, the panel will sit in its place with cable still attached.

A good idea to grease up the bonnet release while it's available. The (rusty)security shield is held by two 8mm bolts. (In addition, it is well worth using a cable tie or similar to secure the release cable end to the lever. These have an annoying habit of coming adrift leaving you unable to access under the bonnet.)

Ooh look! - a radiator.

Now you need to disconnect the top and bottom hose. Check the hoses for any signs of wear or cracks. They are held on with spring clips that need to be compressed to release them. As taking the hoses off at this point this will allow all my coolant to escape, I clamped the hoses between two flat bits of wood.(The cunning plan)
This means that only the coolant in the radiator would be lost.
With the hoses free, the radiator is only now held in position by two further rubber locating holes in the cross member. Ease the radiator up to free the locating pins. Now you can lean the top of the radiator forward in order to access and disconnect the fan connector.
Now ease the radiator up and out.

Not a pretty sight! This radiator is probably the original and is therefore at least seven years old. Most of the cooling fins are rotten, and you can see the temporary repair the AA carried out.

Nice shiny new radiator.

I flushed the new radiator with a hosepipe just to ensure there were no foreign bodies in there.
The fan is held on with three fixed bolts, so I swapped the fan to the new one and tightened the three holding nuts.
The radiator is ready to go in now. Ease it in, connect the fan plug and then fit the locating pins into the lower rubber brackets. I found a little grease on the pins allowed them to slide in smoothly. Do make sure the bleed/fill hole is at the top!
Push the hoses back on and refit the spring clips.

Jacking the front of the car now may aid any bleeding necessary.
Now I refilled the radiator with some coolant I had prepared earlier in a clean container. Once it was full, I slowly released the clamp on the bottom hose. Once the hose was fully open and the radiator full again, I repeated the procedure with the top hose.

I then fitted a new Mike Satur alloy radiator bleed/fill screw I had purchased separately. (Be aware that this MS product only fits the thread on the OE radiator. Your new radiator may have a different thread.)

Now, in theory, there should have been no chance of air getting into the system. However, as the coolant system had completely emptied itself earlier in the week, I still bled the system. There are three bleed points, the radiator bleed screw; the heater bleed screw on the bulkhead;

and the bleed screw on the metal coolant pipe on the engine beneath the throttle body. I could write a book on bleeding, but will spare you.
Check the level in the expansion tank, top up if necessary to the maximum level, refit the pressure cap and start the engine. Keep checking the level as the engine warms up, check for leaks at the radiator.

Assuming all is OK, refit the slam panel; the top radiator locating brackets; the washer bottle; the black plastic shroud, and the spare wheel and tools.

Finally, I was much impressed by Budget-radiators78 on Ebay. Ally MGF radiator for £47.99. Fits perfectly, looks a hell of a lot better than the OE.
It was delivered incredibly quickly, despite me ****ing up the Paypal payment.
The following user(s) said Thank You: Leigh Ping, KentJohn, DavesZed, c.steffan

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Last edit: Post by David Aiketgate. Reason: photo links

Re: Radiator Replacement - How to(v.1) 10 years 11 months ago #20718

Just a couple of additional points about bleeding the systenm

The heater must be set to Hot to enable proper bleeding of the Heater Matrix.

After bleeding the radiator and engine pipe, you can help the bleeding of the heater by squeezing the two large rad flow and return pipes to encourage any air out of the heater loop.

After all that check that your heater is giving hot air after the engine is running.(usually hot within 10 mins)

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Re: Radiator Replacement - How to. 10 years 11 months ago #20725

cool how-to mate :)
Teesside meet, open to all MG/Rs. 3rd Sunday of the month, ask for times and places!!!
"There's something about engines that calms me down"

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Re: Radiator Replacement - How to(v.1) 10 years 11 months ago #20728

Another great bit of work ;)

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Re: Radiator Replacement - How to. 9 years 8 months ago #47720


Thanks for this. I'm just checking it out as this is what I will need to do next weekend!!
I have been struggling with intermittent overheating, and had tried to bleed the system, however the owner before me had obviously had trouble with the radiator bleed nut, and had replace it with a rusty thing with a large flat-headed screw :rant: (I will take a picture for posterity before it comes out!) Despite lots of WD40 and gentle (!) persuasion - it will not budge. My gentle persuasion has also opened the way for the radiator to spring a few leaks :bang: Hence I will be replacing the whole thing!! I am thinking of buying from Budget Radiators too (even though their prices have crept up since you bought!) and had thought about doing the Mike Satur bleed nipple. Question - did your's fit? You seem to suggest that it didn't.

Life is not a rehearsal - carpe diem!

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Last edit: Post by Leigh Ping. Reason: obxiously changed to obviously :)

Re: Radiator Replacement - How to. 9 years 8 months ago #47721

Nah, didn't fit.:nonod:

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Radiator Replacement - How to. 9 years 1 month ago #91353

Using Davids' great guide, I popped my radiator out for an inspection today. -

I don't have a nutserts tool like David has. So, here's my method of dealing with the two 'awkward nuts and bolts'. Pull the grill out slightly and hold the bolt with your finger so that you can then screw on the nut. -

The rad seemed servicable. No apparrent leaks and not too much damage showing. -

I popped some zipties on the bonnet cable whilst I was in there. This should ensure that it doesn't pop out in future. -

Cheers for this great guide David. :broon:
The following user(s) said Thank You: David Aiketgate, c.steffan

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Radiator Replacement - How to. 7 years 10 months ago #139921

Top How-To David, thanks very much :broon:

When replacing the slam panel you'll probably need to adjust the position of it, so be careful when shutting the bonnet.
Oh yeah, and for the sake of removing four screws, loosening four more and taking out two easy bolts I'd take the front bumper off, you can also see the bottom of the rad easier. This also means that you can take out the lower two bolts of the metal strip that have the 'awkward nuts and bolts' at the top and then keep this panel attached to the slam panel. Just an idea but it worked for me.

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Last edit: Post by DavesZed.

Radiator Replacement - How to. 7 years 6 months ago #146793

I just changed my rad this evening. Thanks for the how-to David, it was really helpful.
Clamping the lower hose was a big help. I don't think I lost more than 1/2l of coolant which made bleeding a snap.
The worst part of the job was removing the factory hose clamps. They were obviously attached to the rad before it was installed and were really difficult to get at. Having a second fan didn't help with access either.
I have a Rivnut tool, but it seems nobody around here stocks metric Rivnuts. (Officially Canada is a Metric country, but in practice we are 90% Imperial :slapme: ) Luckily I was able to get both nuts on those awkward bolts first try. Life is good!
It was really nice to replace the rusty rad support bolts with stainless. They were the last crappy looking bolts in the front compartment. Now I can sleep nights.
Thanks again! :broon:
The following user(s) said Thank You: David Aiketgate

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Radiator Replacement - How to. 7 years 6 months ago #146806

If you need metric rivinuts I'll be happy to send some over to you, but remember that they won't be much use if your rivinut tool doesn't have metric mandrels.
"Keep calm, relax, focus on the problem & PULL THE BLOODY TRIGGER"

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Radiator Replacement - How to. 7 years 6 months ago #146942

Thanks Cobber but I've already ordered some off
Even with the postage they work out half the price of buying them in North America!
As for the tool I recently bought a combination rivet/riv-nut tool and made sure to order the metric mandrels along with it. (A good use of the tool allowance I get from work! :broon: )

BTW:I used Allen head bolts and really like the clean look. I just may replace the stainless hex-head bolts I have on the slam panel with stainless Allens.

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Last edit: Post by Rich in Vancouver.
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