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[Tony H]

Hi all, as title it will only blow hot air when the unit is set on "Hi" any ideas what the cause may be?
TIA
Tony

[zirk]

Hi as in Hi Heat?

[Tony H]

Yes zirk heater set at maximum

[sjc]

What MY?

On the pre-facelift climate, there is a fan built into the control unit to sample the air temp from the cabin and adjust as required.  If the fan fails or gets gummed up with fluff/dust then you get the problem you have.  Easy way to check is to put a small piece of tissue paper over the intake (cut-outs above the centre 2 controls) and if it doesn't stay put with the small amount of suction then the fan ain't turning.

Have you done the 'reset flaps' procedure?

Facelift may be a completely different setup.

[Andy H]

Hi all, as title it will only blow hot air when the unit is set on "Hi" any ideas what the cause may be?
TIA
Tony

Probably a faulty outside temperature sensor. What temperature is displayed on the MID?

[Andy B]

.....
.... Probably a faulty outside temperature sensor. What temperature is displayed on the MID?

that assumes Tony's car is a facelift 

[TheBoy]

What MY?

On the pre-facelift climate, there is a fan built into the control unit to sample the air temp from the cabin and adjust as required.  If the fan fails or gets gummed up with fluff/dust then you get the problem you have.  Easy way to check is to put a small piece of tissue paper over the intake (cut-outs above the centre 2 controls) and if it doesn't stay put with the small amount of suction then the fan ain't turning.

Have you done the 'reset flaps' procedure?

Facelift may be a completely different setup.

FL is similar

[Tony H]

Hi all, as title it will only blow hot air when the unit is set on "Hi" any ideas what the cause may be?
TIA
Tony

Probably a faulty outside temperature sensor. What temperature is displayed on the MID?

Thats a good point the outside temp sensor is displaying 44 degrees I think its telling fibs cos it's rather freezing up here. By the way my miggy is a facelift

[Andy B]

.... By the way my miggy is a facelift

It's that long since I've seen you I couldn't remember 

[Andy H]

Hi all, as title it will only blow hot air when the unit is set on "Hi" any ideas what the cause may be?
TIA
Tony

Probably a faulty outside temperature sensor. What temperature is displayed on the MID?

Thats a good point the outside temp sensor is displaying 44 degrees I think its telling fibs cos it's rather freezing up here. By the way my miggy is a facelift

That's the problem identified then.
A new sensor is cheap and easy to fit which may fix the problem. If it doesn't then you need to look for corroded connectors and damaged wiring in the loom the sensor shares with the front foglights.

[sjc]

I've got a sensor here, can double-check it's working.

[Tony H]

.... By the way my miggy is a facelift

It's that long since I've seen you I couldn't remember 

Yeah not been able to make any meets for a while hope to catch you at the next one

[Andy B]

.... By the way my miggy is a facelift

It's that long since I've seen you I couldn't remember 

Yeah not been able to make any meets for a while hope to catch you at the next one

Like wise ...... see you then 

I'll park my Merc in a corner out of the way