Hi jet 993 Thermostat fitted.

Well found out why having the problems with thermostat, my car didnt have one in, it had been removed and the fan wired to be on constantly. The thermostat is in, seems to be going ok, but I think needs flushing (friend advised). Am expecting problems as it must of overheated in the past for someone to remove the thermostat. Temperature guage went up to half way after driving about 10 mins, stopped at that for a while then cooled right down, could this be an airlock. Any tips would be much appreciated.
Balbarh

Did you refill the cooling system exactly as per the instructions (i.e., remove rad cap and blanking cap, header rail cap, temp control to hot, fill until water comes out of header rail, refit header rail cap, fill radiator is full, refit rad cap and blanking cap)?

When temp gauge reads normal, is rad an even temperature from top to bottom?

ours does that the needle goes up and down like a yo yo and just after a fill it goes up a lot hotter than normal driving and the settles back to a yo yo between the lower cold mark and about the middle where the thermometer logo is.

if in doubt on how to bleed the cooling system, my van 998 EFI has instructions under the front flap that gets you access to the radiator cap

rich the mechanic wrote:ours does that the needle goes up and down like a yo yo and just after a fill it goes up a lot hotter than normal driving and the settles back to a yo yo between the lower cold mark and about the middle where the thermometer logo is.

That's interesting - mine only does that when it's very low on water. Maybe your rad is partially blocked? I fitted an exchange rad and a new pressure cap to my S-reg 998 and it's been perfect ever since.

PFM wrote:That's interesting - mine only does that when it's very low on water. Maybe your rad is partially blocked? I fitted an exchange rad and a new pressure cap to my S-reg 998 and it's been perfect ever since.

I have had our rad off several times and repaired a couple of leaks it flows through fine it has had a problem on the fuel which was the MAP sensor and since I have changed it the fan switch in the rad has started working I cant see how its connected on the wiring diagram but where as before it was nearly always yoyoing now it does settle quicker it used to take 30 miles now it sorts in about 15 and then sits fairly steady.