overheating, need advice!

[MudRat]

no water loss, no oil mixing, heats up on motorways when doing 70 for a little while, slow down, heating on full blast, temp drops, washed out the rad (very muddy) what else ???

[DiscoCWK]

no water loss, no oil mixing, heats up on motorways when doing 70 for a little while, slow down, heating on full blast, temp drops, washed out the rad (very muddy) what else ???

Thermostat could be jammed

stick it in a pan of water and see if it opens when the water gets hotter

[Skibum346]

no water loss, no oil mixing, heats up on motorways when doing 70 for a little while, slow down, heating on full blast, temp drops, washed out the rad (very muddy) what else ???

Thermostat could be jammed

stick it in a pan of water and see if it opens when the water gets hotter

Or just take it out altogether and see what happens... cost somethng like a fiver so I'd be tempted to do it anyway!

Could also be your ater pump vanes have worn down too far... they aint expensive either...

[beast5680]

could also be the rad clogged internally restricting water flow or the viscous fan failing

[Mark2Disco]

mine did the same
65 mph on motorway was ok
70mph on motorway overheated instantly
rad clogged with mud
must have taken an hour to clean with hose on full blasting it from the front and back of the rad
and got a bucket full of mud out of it
been fine since
hope yours is the same

[Mark2Disco]

cheap to sort out
for a change

[needbeer]

mine does it aswell ive read a post that says it happens after you tweak your fuel pump

[MudRat]

interesting as i have done the pump, has this happened to anyone else??

[BigA]

i had a similar problem when i had my 90, and it was after i replaced the pump too ?

My problem turned out to be an air lock when i refilled after the pump replacement??

Andy

[thermidorthelobster]

Back-flush the rad (disconnect it then use a normal hose to run water through it the wrong way);  you'll probably find a lot of crud comes out.  If it's particularly bad a new one might be the easiest solution.

[BigA]

I guess fitting a new pump will mean more flow through the rad, so any crap will have been pushed about ??

How easy was the pump replacement, as i have a nasty suspicion mine is leaking and on its way out?

[needbeer]

here are lee have a little read http://dodgeram.org/tech/dsl/more_power/Power_ve.htm
when mine started geting hot i backed off the right foot and the temp came down

[extreme90]

here are lee have a little read http://dodgeram.org/tech/dsl/more_power/Power_ve.htm
when mine started geting hot i backed off the right foot and the temp came down

pump tweaks alter the EGT temp  (exhaust gas tempreture) more than overall engine temp

my 200 90 has full width intercooler blocking the rad aswel as a 8274 infront of that, and it still runs the same as it did before  :shock:
( diaphram 90 degree...smoke screw 1 1/2 turns in...turbo 1.1 bar )

id say backflush the rad as thermidor said previous

dan

[Dr Strangeglove]

I have a V8 Rangie.  I bought it, drove on the motorway fine.  Then I let a mate of mine drive it up a hill on quite a rough dirt track - got to the top and overheated.

I took the thermostat out and it was slightly better (this is after I did the head gaskets that I had blown on the overheating).  A gent said keep your heater going when it’s hot and see if it blows hot and cold as this could be a sign of the pump not working.

The main opinion from those that had suffered the same (but remember this is a V8 auto) was that the rad is likely to be blocked on the inside.  As it’s a V8 auto the rads are not cheep so I did not want to change it unless it needed it.  Eventually ordered one from a place in Bradford (approx £180 delivered - but mine has two oil coolers due to it being auto) and fitted it to the RR.  I had it running but could not get the temperature gauge to work - thought I had [!Expletive Deleted!] it up as I am not a mechanic by any stretch of the imagination.  On another dry spell I fitted the thermostat back in.  The beast got to temperature and remained stable just below half way!  (was chuffed to bits as I could not afford the heads going again!)

On inspecting the rad before removal, I noticed the bottom two rows of the rad (about 1/2") had the concertina fins flaking slightly.  All the others seemed OK.  After taking it off, the fins that were on the front of the rad (not accessible due to air con rad) turned to dust when I touched them (and I mean dust!).

Just thought it was worth a mention as I would hate you to suffer an overheat like I did (a bit more of a problem on the V8 mind!).

Good luck mate - hope it’s sorted soon (and with minimum outlay).

Regards

Mick