overheating - thermostat

ⓡⓤⓓⓨ;1521801 said:

Hi guys,

I thought I had the problem fixed NOT

I booked the RR in for an MOT tomorrow morning and thought, I'd give it a trash down the road>
About a 5 mile trip and when back in the drive water was spraying from the expansion cap!
bottom hose from Thermostat was cold

Now I have replaced both, t-stat and expansion cap and even tested the t-stat before fitting it. (was working fine)

I have spent about an hour trying to get all air out of the system - t-stat still does not open.

The weird part is though that when I let it idle for no matter how long - it will not overheat, nor will the t-stat open.

Any ideas

Click to expand...

I changed my rad and bleed the system but still kept pressuring so i did 7,500 mile with the rad cap slightly loose... until it over heated a few days ago, i did the usual thermostat etc etc and spent an hour bleeding it up and thort it was done... i ended up doing a vacum pressure fill (not the house hold one ) and hey presto it cured it even got pressure cap fully tightend so id say just go to a garage and ask them to vacum pressure fill the cooling system. its the only way to get the air out.

Mike v.t.s said:

I changed my rad and bleed the system but still kept pressuring so i did 7,500 mile with the rad cap slightly loose... until it over heated a few days ago, i did the usual thermostat etc etc and spent an hour bleeding it up and thort it was done... i ended up doing a vacum pressure fill (not the house hold one ) and hey presto it cured it even got pressure cap fully tightend so id say just go to a garage and ask them to vacum pressure fill the cooling system. its the only way to get the air out.

Click to expand...