Heater

I noticed today on my classic, that when you put the heater fan on full (after the engine is warm) and set to hot it only blows hot for a little while and then gets progersivley colder like it cant provide enough hot water.

Does anyone know what this is and how to fix it?

fett said:

I noticed today on my classic, that when you put the heater fan on full (after the engine is warm) and set to hot it only blows hot for a little while and then gets progersivley colder like it cant provide enough hot water.

Does anyone know what this is and how to fix it?

Click to expand...

what engine is in it ?

3.9 petrol ?

Ere Truckie, I needed to ask you summit,


Can't remember for the life of me what it was though

Yeah 3.9 v8, its the 1990 auto

Sirus said:

Ere Truckie, I needed to ask you summit,


Can't remember for the life of me what it was though

Click to expand...

thats the two of us then

:focus:

fett said:

:focus:

Click to expand...

yeah si

90truckcab said:

yeah si

Click to expand...

Oooops my bad

So whats up with the bloody thing lol

Sirus said:

Oooops my bad

Click to expand...

yup , yer stole his fred , how dare you !

any ways back to topic!



yer remember what yer wanted si !

oh , if any one has any ideas regarding this ere heater thingy , please post below

fett said:

So whats up with the bloody thing lol

Click to expand...

thermostat ...

Really how come?, stuck open so engine doesnt get hot enough? it seems to warm up nicley on the guage

fett said:

Really how come?, stuck open so engine doesnt get hot enough? it seems to warm up nicley on the guage

Click to expand...

sounds ok then,

yer checked the hoses etc, ? any air locks in matrix ?

I did change the coolant this sumer and have only used the heater a few times since so I guess it could be an airlock, Could it work its way round and cook the motor?

No leaks on hoses.

fett said:

I did change the coolant this sumer and have only used the heater a few times since so I guess it could be an airlock, Could it work its way round and cook the motor?

No leaks on hoses.

Click to expand...

If you did coolant change in summer did you remember to leave the heater fully hot during drain down and refill? Airlock in itself won't cook motor, but if coolant flow is severely compromised you could get overheating, but you should have already seen that if it was going to be a problem.

kernowdragon said:

If you did coolant change in summer did you remember to leave the heater fully hot during drain down and refill? Airlock in itself won't cook motor, but if coolant flow is severely compromised you could get overheating, but you should have already seen that if it was going to be a problem.

Click to expand...

Yup heater was fully open when I did the coolant.

I did a 200 mile round trip in the storms today and it didnt miss a beat. I was only brave enought to put the heater on for the last 15 miles or so but again it is fine on the low settings of fan but after a few mins on full blast it runs outa hot!

I was hoping this was common and peeps would know how to fix it:doh:

It still could be the thermostat not opening correctly and over cooling.

Maybe , it warms up so well though and never overheats in after hours of idling in the summer with the aircon on or off.